CN116411226B - Ultra-low carbon flexible wire steel SWRM6 and preparation method thereof - Google Patents
Ultra-low carbon flexible wire steel SWRM6 and preparation method thereof Download PDFInfo
- Publication number
- CN116411226B CN116411226B CN202310407728.5A CN202310407728A CN116411226B CN 116411226 B CN116411226 B CN 116411226B CN 202310407728 A CN202310407728 A CN 202310407728A CN 116411226 B CN116411226 B CN 116411226B
- Authority
- CN
- China
- Prior art keywords
- carbon
- steel
- ultra
- low
- casting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 157
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 146
- 239000010959 steel Substances 0.000 title claims abstract description 146
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 124
- 238000002360 preparation method Methods 0.000 title description 5
- 238000000034 method Methods 0.000 claims abstract description 62
- 238000009749 continuous casting Methods 0.000 claims abstract description 35
- 239000002893 slag Substances 0.000 claims description 73
- 239000007788 liquid Substances 0.000 claims description 45
- 238000004519 manufacturing process Methods 0.000 claims description 40
- 238000005266 casting Methods 0.000 claims description 39
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 34
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 34
- 239000011572 manganese Substances 0.000 claims description 34
- 239000001301 oxygen Substances 0.000 claims description 34
- 229910052760 oxygen Inorganic materials 0.000 claims description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 31
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 29
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 28
- 238000005261 decarburization Methods 0.000 claims description 28
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 28
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 24
- 239000000292 calcium oxide Substances 0.000 claims description 24
- 229910052782 aluminium Inorganic materials 0.000 claims description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 23
- 238000003723 Smelting Methods 0.000 claims description 22
- 238000005096 rolling process Methods 0.000 claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 229910052786 argon Inorganic materials 0.000 claims description 17
- 229910052698 phosphorus Inorganic materials 0.000 claims description 16
- 150000002910 rare earth metals Chemical class 0.000 claims description 15
- 238000007670 refining Methods 0.000 claims description 14
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 13
- 239000011574 phosphorus Substances 0.000 claims description 13
- -1 rare earth calcium oxide Chemical class 0.000 claims description 13
- 229910052717 sulfur Inorganic materials 0.000 claims description 13
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 229910052748 manganese Inorganic materials 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 11
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 10
- 239000011575 calcium Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 10
- 239000011593 sulfur Substances 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 9
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 238000005262 decarbonization Methods 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 229910052746 lanthanum Inorganic materials 0.000 claims description 4
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 10
- 230000001681 protective effect Effects 0.000 description 8
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 229910052593 corundum Inorganic materials 0.000 description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000003749 cleanliness Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010622 cold drawing Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005502 peroxidation Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 238000009489 vacuum treatment Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- LPUQAYUQRXPFSQ-DFWYDOINSA-M monosodium L-glutamate Chemical compound [Na+].[O-]C(=O)[C@@H](N)CCC(O)=O LPUQAYUQRXPFSQ-DFWYDOINSA-M 0.000 description 1
- 235000013923 monosodium glutamate Nutrition 0.000 description 1
- 239000004223 monosodium glutamate Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to the field of ferrous metallurgy, and particularly provides ultra-low carbon flexible wire steel SWRM6 which comprises the following components: the ultra-low carbon flexible wire steel is reasonably matched with the component combination process, the grain size of the product is 9.5-10 by adjusting procedures such as batching, electric furnace, RH, LF, continuous casting and the like, the drawing wire breakage rate reaches 3-5 times/hundred t, the elongation after break A11.3 is more than 33%, and thus the use requirement of the market on the ultra-low carbon flexible wire steel SWRM6 is met.
Description
Technical Field
The application relates to an ultra-low carbon flexible wire steel SWRM6 and a preparation method thereof, in particular to an ultra-low carbon flexible wire steel SWRM6 with excellent tensile property and a preparation method thereof, and belongs to the field of ferrous metallurgy.
Background
SWRM6 has extremely strict technological requirements, and the breakage rate in the domestic steel drawing process is higher, and SWRM6 belongs to low-carbon flexible wire steel, and is mainly used for drawing thick wires to manufacture net parts such as welded nets, manufacturing hardware small parts with stamping deformation such as bending and flattening, manufacturing low-strength nuts, drawing 0.10mm thin wires and the like. The SWRM series low-carbon steel wire rods are classified into SWRM6, SWRM8, SWRM10, SWRM12, SWRM15, SWRM17, SWRM20, etc. according to chemical composition by executing Japanese JIS-G3505 standard. The method is mainly characterized by low carbon and low alloy, and meanwhile, the subsequent processes such as cold heading, stamping, cold drawing and the like are required to be processed, so that the requirement on the processing performance of steel is relatively high, and the requirement on the cleanliness of molten steel is relatively high in the steelmaking.
In the prior art, CN102719728A discloses a process for producing acid-resistant pipeline steel by RH-LF-VD refining, which comprises the steps of molten iron pre-desulfurization-converter smelting-RH vacuum decarburization-LF heating desulfurization-VD re-vacuum decarburization-calcium treatment-soft blowing-continuous casting-hot rolling, wherein the smelting process of components in steel is accurately controlled by converter steelmaking and RH-LF-VD refining. However, although it is suitable for producing low-carbon steel, it adopts VD refining, which increases production cost, and the slag former is not suitable for steel with low alloy degree.
Analysis of reasons for drawing breakage of SWRM6 wire rod, wen Juan, etc., china metallurgy, volume 25, phase 5, discloses hot rolled wire rods of SWRM6 in certain wire works, with a specification of Φ6.5mm. When in use, the copper plating process is carried out after the diameter of the copper plating film is drawn from phi 6.5mm to phi 1.6mm without heat treatment. After the user pulls out, the wire rod is found to have serious fracture, and sampling analysis is performed for searching the fracture reason. The analysis results show that the fracture sample is ductile fracture. Slag inclusion exists at the crack of the sample, the plasticity of the slag inclusion is lower, and the slag inclusion is separated from the matrix during rolling, so that the wire rod is cracked. The mass fraction of the slag inclusion carbon is far higher than that of the matrix carbon by the analysis of an electronic probe energy spectrometer, so that the peripheral area of the defect is carburised, and tissues such as sorbite, network cementite and the like which are different from the matrix appear. The network cementite also causes drawing fracture of the SWRM6 wire rod during the drawing process. Slag inclusions existing beside cracks are a main cause of cracking of wire rods, so it is recommended to keep the continuous casting process stable during wire rod production and prevent molten steel slag from rolling. From the above analysis, the purity of molten steel is critical to drawing fracture, and how to reduce slag inclusion and improve the purity of wire steel is a problem to be solved.
Disclosure of Invention
According to the invention, through the design of optimized components and the improvement of a combined process, the domestic high-performance ultra-low carbon flexible wire steel SWRM6 is obtained, the grain size after continuous casting reaches 9.5-10, the drawing wire breakage rate is less than 5 times/hundred t, and the elongation after breakage A11.3 is more than 33%.
Specifically: the invention provides an ultra-low carbon flexible wire steel SWRM6, wherein the ultra-low carbon flexible wire steel comprises the following components: less than or equal to 0.04 percent of C, less than or equal to 0.03 percent of Si, 0.10 to 0.23 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, 0.008 to 0.012 percent of La, and the balance of Fe and unavoidable impurities.
The ultra-low carbon flexible wire steel SWRM6 comprises the following components: 0.02-0.03% of C, 0.015-0.02% of Si, 0.15-0.2% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.002-0.003% of La and the balance of Fe and unavoidable impurities.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the steps of electric furnace smelting, RH furnace deoxidization and decarburization, LF refining, continuous casting and rolling, drawing and warehousing.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following steps: in order to reduce the initial carbon content, the charging iron ratio is 15-20%, and low-carbon clean scrap steel is adopted; endpoint carbon 0.05 plus or minus 0.01%, endpoint S less than or equal to 0.035%, endpoint phosphorus less than or equal to 0.015%; and (3) tapping is weakly deoxidized, no deoxidizer is added, only 1.5kg/t of medium carbon ferromanganese is added, and rare earth La grains are added before the medium carbon ferromanganese is added.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following steps of: using a natural decarburization mode, wherein the target endpoint carbon is 0.02-0.04%; adjusting molten steel components, adjusting manganese by using low-carbon ferromanganese, and referencing the absorptivity Mn of 90%; oxygen is determined after decarburization, and aluminum particles are used for deoxidizing according to the oxygen determination condition, wherein 3ppm of aluminum is deoxidized per 1Kg of aluminum, and the oxygen activity is controlled to be 20-35ppm, preferably 30ppm.
The production method of the ultra-low carbon flexible wire steel SWRM6, wherein the LF procedure comprises the following steps: adding slag former to make slag, and determining treatment time according to sulfur content and temperature of molten steel, the slag layer is required to be thicker and good in fluidity, and the slag former adopts rare earth calcium oxide slag system (25% La) 2 O 3 +25％CaO+50％CaF 2 )。
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following continuous casting and rolling steps: maintaining the liquid level of the high school bag for casting, wherein the liquid level is 800-900mm in the process, and maintaining the liquid level stable;
using a Mg-Ca dry material tundish, performing full protection casting, blowing argon into the tundish for casting, and performing argon flow of a large ladle protection sleeve at 30-50L/min, wherein when no sleeve is added, adding a covering agent into an impact area of the tundish is strictly forbidden, and the tundish uses a low-carbon high-alkalinity covering agent;
controlling the superheat degree of the big ladle at 15-25 ℃, adopting automatic liquid level control, keeping the liquid level of the crystallizer stable, and stabilizing the target working pull speed within the range of 2.4-2.8 m/min;
when continuous casting is stopped, the casing is firstly stopped and then is removed, and bare casting is strictly forbidden.
The invention combines the reasonable matching of the process by adding rare earth, and adjusts the working procedures of proportioning, electric furnace, RH, LF, continuous casting and the like, for example, the invention has lower superheat degree and higher work pull rate. Thereby obtaining a product with the grain size of 9.5-10 and small slag inclusion, greatly reducing the drawing broken wire rate to 3-5 times/hundred tons, and realizing the excellent performance of the elongation A11.3 after breaking above 33 percent on the basis of obtaining ultra-low carbon.
Detailed Description
The development of the ultra-low carbon flexible wire steel SWRM6 is just based on the existing equipment conditions of the factory, optimizes the field operation process, is made for optimizing the product structure of the factory, and combines the production technology and equipment conditions of the factory, the production process flow of the ultra-low carbon flexible wire steel SWRM6 is as follows: molten iron and clean scrap steel, smelting in a 100t electric furnace, RH, LF refining, continuous casting, hot rolling (high-line) and warehousing.
As described above, the ultra-low carbon flexible wire steel SWRM6 is required to have higher plasticity and higher elongation after break, and is required to improve the cleanliness and homogeneity of molten steel in the preparation process, and the SWRM ultra-low carbon flexible wire steel with excellent performance is obtained by continuously debugging and improving the reasonable design component combination process, thereby breaking through the foreign technical blockade and barrier, realizing domestic high-end products and enhancing the market competitiveness.
An ultra-low carbon flexible wire steel SWRM6 comprising the following components: c is less than or equal to 0.04%, si is less than or equal to 0.03%, mn is 0.10-0.23%, P is less than or equal to 0.020%, S is less than or equal to 0.015%, la is 0.008-0.012%, and the balance is Fe and unavoidable impurities, the grain size of the ultra-low carbon flexible wire steel SWRM6 is 9.5-10, the drawing wire breakage rate reaches 3-5 times/hundred t, and the elongation after breakage A11.3 is above 33%.
For the composition design of the ultra low carbon cord steel SWRM6, first low carbon is the primary condition for obtaining cord steel, however, it is subject to process limitations and minimum strength requirements, and therefore, the carbon content is 0.04% or less, preferably 0.02 to 0.03%.
Si is an important reducing agent and deoxidizer in the steelmaking process, and for many materials in carbon steel, si is contained in an amount of 0.5% or less, and is generally introduced as a reducing agent and deoxidizer in the steelmaking process. Silicon can promote columnar crystal growth in cast steel and reduce plasticity. The high silicon steel grade cools faster when heated, and breaks due to the low thermal conductivity and the large temperature difference between the inside and outside of the steel. Silicon may reduce the weldability of the steel. Because silicon has a higher binding capacity with oxygen than iron, a silicate with a low melting point is easily generated during welding, and fluidity of slag and molten metal is increased, so that a splash phenomenon is caused, and welding quality is affected. So that the lower the content of silicon in the finished product is, the better the control is, and therefore, the Si content is not more than 0.03%, preferably 0.015 to 0.02%, depending on the characteristics of the steel type.
Mn can improve the strength of the steel, and because Mn is relatively cheap and can be infinitely dissolved with Fe, the Mn has relatively little influence on plasticity while improving the strength of the steel. Manganese is therefore a strengthening element widely used in steel. It can be said that substantially all carbon steel contains Mn. Typically the Mn content in the mild steel will not exceed 0.5%. Mn improves the hardenability of the steel and improves the hot workability of the steel; mn can eliminate the influence of S (sulfur), and Mn can form high-melting-point MnS with S in steel smelting, so that the adverse influence of S is weakened and eliminated. The higher the Mn content is, the better, and the higher the Mn content is, the lower the plasticity and weldability of the steel, and therefore, the Mn content is preferably 0.10 to 0.23%, more preferably 0.15 to 0.2% in the present invention.
Phosphorus is also a hazardous element in general. Phosphorus can increase the strength and hardness of steel, but causes a significant decrease in plasticity and impact toughness. Particularly at low temperatures, it makes the steel significantly brittle, a phenomenon known as "cold shortness". The cold embrittlement worsens the cold working and weldability of the steel, and the higher the phosphorus content is, the greater the cold embrittlement is, so that the phosphorus content in the steel is controlled more tightly. SWRM6 needs cold heading, stamping, cold drawing and other technological processing treatment, so that P is strictly controlled to be less than or equal to 0.020 percent.
The rare earth element is called industrial monosodium glutamate, the application is wider and wider in the steel manufacturing technology, meanwhile, rare earth resources in China are rich, the inventor finds through experiments that rare earth La particles are added before adding medium carbon ferromanganese so as to add rare earth, meanwhile, in the production engineering of online steel, a rare earth calcium oxide slag system is added for slagging when slagging and impurity removal are carried out, the effects of effectively purifying steel and removing impurities can be achieved, grains can be refined, uniformity of the online steel is promoted, and therefore, the performance of the ultra-low carbon flexible wire steel SWRM6 is greatly improved, the excellent performance of the elongation A11.3 after breakage is more than 33% is obtained, and finally the content of rare earth La in the product is determined to be 0.008-0.012%, and the preferable content is 0.01%.
The influence of related elements on the performance of the ultra-low carbon flexible wire steel SWRM6 and the actual production component control capability of the factory are combined, and the content range of the elements is controlled to effectively improve the performance of the ultra-low carbon flexible wire steel SWRM 6.
For the ultra low carbon flexible wire steel SWRM6, reasonable process steps are necessary to be matched with the ultra low carbon flexible wire steel SWRM6, and the process steps of the invention comprise:
study of low-carbon smelting process
SWRM6 is the lowest carbon brand in the whole SWRM family, and how to control the finished carbon is the key to successful product rolling.
Decarburization in the oxidation stage in electric furnace smelting is not a purpose, but is taken as a boiling molten pool, and molten steel gas (hydrogen and nitrogen) and impurities are removed, so that the purpose of cleaning molten steel is achieved. With sufficient degassing speed, a certain decarburization amount is needed to ensure a certain boiling time to achieve a certain degassing amount. According to the smelting dynamics and thermodynamic conditions of the electric furnace, carbon is difficult to remove to less than 0.05%, and the peroxidation of molten steel is easy to cause, so that adverse effects are brought to the treatment of subsequent procedures and the quality of molten steel. The remaining decarburization is effected by vacuum decarburization.
Oxygen blowing decarburization under vacuum conditions is a process for smelting low-carbon steel, and is generally carried out under the vacuum degree of 20kPa to 6.7kPa, and oxygen reacts with carbon in molten steel to generate CO, namely:
[C]+[O]＝CO↑
in the reaction formula, the equilibrium constant k=PCO/(ωC.ωO) is reduced from 1 atmosphere to 20kPa or less in the vacuum state, and ωC.ωO is reduced accordingly, thereby achieving the purpose of decarburization.
Generally, the LF process is a slow carburising process, the carbon source being mainly electrode dissolution. The carbon is controlled during LF processing primarily to reduce electrode contact with the molten steel.
Inclusion control study
SWRM6 has high requirement on steel plasticity, and the cleanliness of molten steel needs to be improved to ensure the performance of the SWRM 6. The molten steel smelting process mainly comprises electric furnace and RH vacuum treatment, LF is only used as a supplementary heating and desulfurizing process, and the related steel slag interface reaction in the refining process is only carried out in the LF process. In order to improve the purity of molten steel, the selection of a refined slag system is particularly important, and the dynamics principle of absorbing inclusion by the refined slag is as follows: firstly, original inclusions in the steel float upwards and are absorbed and removed by slag through contact and collision with the slag. Slag and inclusionsThe interfacial tension is much smaller than the interfacial tension between molten steel and inclusions, so inclusions in steel are easily absorbed by slag droplets in contact with them. Secondly, caO-Si0 is adopted 2 -A1 2 0 3 -MgO-CaF 2 The slag system is an oxide melt, and the inclusions are mostly oxides, so the inclusions absorbed by the slag are relatively easy to dissolve in the slag and float upwards along with slag drops to be discharged. However, the above slag system does not achieve the properties required for the present invention. The reason mainly includes that the main types of inclusions in the ultra-low carbon steel casting blank are Al2O3, tiN and Al2O3+TiN composite inclusions, the independently distributed Al2O3 inclusions are mainly small particles, the inclusions with the particle size less than 10um account for more than 90 percent, and the maximum particle size is not more than 20um. The independent inclusion particles have smaller particle size and have small influence on the quality of products. Therefore, the generation of clustered Al2O3 is controlled with emphasis, and the method can be started from two aspects.
First, studies have shown that the formation of clustered Al2O3 has a close relationship with total oxygen content. In fact, the quality of the finished product is greatly affected by the types, sizes, shapes, distribution and the like of the inclusions. The method can be seen from strict requirements of different steel factories at home and abroad on different target values of products and sizes of inclusions. The assessment of steel quality with total oxygen is only meaningful under relatively clean conditions of the steel.
Therefore, for controlling the smelting inclusion of the ultra-low carbon steel, starting from controlling the total oxygen content, the peroxidation degree of the smelting molten steel of the electric furnace is reduced; weakly deoxidizing during tapping to reduce the generation of deoxidized products; through vacuum treatment, decarburization and deoxidation are achieved through carbon-oxygen reaction at the same time of decarburization. Thereby realizing the technological requirements of reducing steel type inclusions and improving the cleanliness of molten steel.
Secondly, starting from the selection of slag system, in order to improve the purity of molten steel and reduce the grain size of the final soft wire steel, a rare earth calcium oxide slag system (25% La 2 O 3 +25％CaO+50％CaF 2 ) The method combines with the control of the total oxygen content, reduces the addition of aluminum, avoids the formation of clustered Al2O3 inclusions, simultaneously adopts a rare earth calcium oxide slag system to reduce the use amount of La particles, can more accurately control the rare earth content, and reduces the cost.
Ultralow carbon smelting process technology
Electric furnace working procedure: reducing the initial carbon content, and charging 15-20% of iron ratio, wherein low-carbon clean scrap steel is adopted; endpoint carbon 0.05 plus or minus 0.01%, endpoint S less than or equal to 0.035%, endpoint phosphorus less than or equal to 0.015%; and (3) tapping is weakly deoxidized, no deoxidizer is added, only 1.5kg/t of medium carbon ferromanganese is added, and rare earth La grains are added before the medium carbon ferromanganese is added.
RH process: using the natural decarburization mode, the target endpoint carbon was 0.02%. Adjusting molten steel components, adjusting manganese by using low-carbon ferromanganese, and referencing the absorptivity Mn of 90%; oxygen is determined after decarburization, aluminum particles are used for deoxidizing according to the oxygen determination condition, and 3ppm of aluminum is deoxidized every 1Kg of aluminum, and the oxygen activity is controlled to be 20-35ppm, preferably 30ppm.
LF working procedure: adding rare earth calcium oxide slag system (25% La) 2 O 3 +25％CaO+50％CaF 2 ) Slag formation, and determining the treatment time according to the sulfur content and the temperature of molten steel. The slag layer is required to be thicker, about 70mm and good in fluidity.
Continuous casting control technology
The continuous casting operation control is important to the quality of casting blanks, so that the continuous casting process has the following requirements of smooth casting without flocculation, carburetion, secondary oxidation, air suction and slag inclusion:
strictly controlling chemical components according to internal control standards;
maintaining the liquid level of the high school bag for casting, wherein the liquid level is 800-900mm in the process, and maintaining the liquid level stable;
using a Mg-Ca dry material tundish, performing full protection casting, blowing argon into the tundish for casting, and performing argon flow of a large ladle protection sleeve at 30-50L/min, wherein when no sleeve is added, adding a covering agent into an impact area of the tundish is strictly forbidden, and the tundish uses a low-carbon high-alkalinity covering agent;
the purity of the steel obtained by the invention is high, so that the superheat degree of the ladle can be controlled to be 15-25 ℃, the segregation defect is greatly reduced, the liquid level of the crystallizer is kept stable by adopting automatic liquid level control, the target working pulling speed is stabilized in the range of 2.4-2.8m/min, the working efficiency is improved, and the stability and the stretchability of the wire steel are enhanced;
when continuous casting is stopped, the casing is firstly stopped and then is removed, and bare casting is strictly forbidden.
Example 1
An ultra-low carbon flexible wire steel SWRM6, wherein the composition of the ultra-low carbon flexible wire steel is shown in table 1.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the steps of electric furnace smelting, RH furnace deoxidization and decarburization, LF refining, continuous casting and rolling, drawing and warehousing.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following electric furnace smelting steps: in order to reduce the initial carbon content, the iron ratio of the furnace is 16 percent, and low-carbon clean scrap steel is adopted; endpoint carbon 0.04%, endpoint S less than or equal to 0.035%, endpoint phosphorus less than or equal to 0.015%; and (3) tapping is weakly deoxidized, no deoxidizer is added, only 1.5kg/t of medium carbon ferromanganese is added, and rare earth La grains are added before the medium carbon ferromanganese is added.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following steps of: using a natural decarbonization mode, the target endpoint carbon is 0.02%; adjusting molten steel components, adjusting manganese by using low-carbon ferromanganese, and ensuring that the absorptivity Mn is 90%; oxygen was supplied after the decarburization was completed, and aluminum pellets were used for deoxidation according to the oxygen supply condition, 3ppm was used for deoxidation per 1Kg of aluminum, and the oxygen activity was controlled at 30ppm.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following steps of: adding a slag former to form slag, determining the treatment time according to the sulfur content and the temperature of molten steel, wherein the slag layer is required to be thicker and has good fluidity, and the slag former adopts a rare earth calcium oxide slag system of 25 percent La 2 O 3 +25％CaO+50％CaF 2 。
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following continuous casting and rolling steps: maintaining the liquid level of the high-middle ladle for casting, wherein the liquid level is 850mm in the process, and maintaining the liquid level stable;
using a Mg-Ca dry material tundish, performing full protection casting, blowing argon into the tundish for casting, and tightly prohibiting the addition of a covering agent into an impact area of the tundish when a large ladle of protective sleeve is not sleeved, wherein the argon flow of the large ladle of protective sleeve is 45L/min, and the tundish uses a low-carbon high-alkalinity covering agent;
controlling the superheat degree of the big ladle at 23 ℃, adopting automatic liquid level control, keeping the liquid level of the crystallizer stable, and stabilizing the target working pull speed at 2.6m/min;
when continuous casting is stopped, the casing is firstly stopped and then is removed, and bare casting is strictly forbidden.
Example 2
An ultra-low carbon flexible wire steel SWRM6, wherein the composition of the ultra-low carbon flexible wire steel is shown in table 1.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the steps of electric furnace smelting, RH furnace deoxidization and decarburization, LF refining, continuous casting and rolling, drawing and warehousing.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following steps: in order to reduce the initial carbon content, the iron ratio of the furnace is 16 percent, and low-carbon clean scrap steel is adopted; endpoint carbon 0.06%, endpoint S less than or equal to 0.035%, endpoint phosphorus less than or equal to 0.015%; and (3) tapping is weakly deoxidized, no deoxidizer is added, only 1.5kg/t of medium carbon ferromanganese is added, and rare earth La grains are added before the medium carbon ferromanganese is added.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following steps of: using a natural decarbonization mode, the target endpoint carbon is 0.04%; adjusting molten steel components, adjusting manganese by using low-carbon ferromanganese, and referencing the absorptivity Mn of 90%; oxygen was supplied after the decarburization was completed, and aluminum pellets were used for deoxidation according to the oxygen supply condition, 3ppm was used for deoxidation per 1Kg of aluminum, and the oxygen activity was controlled at 30ppm.
The production method of the ultra-low carbon flexible wire steel SWRM6, wherein the LF procedure comprises the following steps: adding a slag former to form slag, determining the treatment time according to the sulfur content and the temperature of molten steel, wherein the slag layer is required to be thicker and has good fluidity, and the slag former adopts a rare earth calcium oxide slag system of 25 percent La 2 O 3 +25％CaO+50％CaF 2 。
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following continuous casting and rolling steps: maintaining the liquid level of the high-middle ladle for casting, wherein the liquid level is 900mm in the process, and maintaining the liquid level stable;
using a Mg-Ca dry material tundish, performing full protection casting, blowing argon into the tundish for casting, and tightly prohibiting the addition of a covering agent into an impact area of the tundish when a large ladle of protective sleeve is not sleeved, wherein the argon flow of the large ladle of protective sleeve is 45L/min, and the tundish uses a low-carbon high-alkalinity covering agent;
controlling the superheat degree of the big ladle at 25 ℃, adopting automatic liquid level control, keeping the liquid level of the crystallizer stable, and stabilizing the target working pull speed at 2.8m/min;
when continuous casting is stopped, the casing is firstly stopped and then is removed, and bare casting is strictly forbidden.
Example 3
An ultra-low carbon flexible wire steel SWRM6, wherein the composition of the ultra-low carbon flexible wire steel is shown in table 1.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the steps of electric furnace smelting, RH furnace deoxidization and decarburization, LF refining, continuous casting and rolling, drawing and warehousing.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following steps: in order to reduce the initial carbon content, the iron ratio of the furnace is 16 percent, and low-carbon clean scrap steel is adopted; endpoint carbon 0.04%, endpoint S less than or equal to 0.035%, endpoint phosphorus less than or equal to 0.015%; and (3) tapping is weakly deoxidized, no deoxidizer is added, only 1.5kg/t of medium carbon ferromanganese is added, and rare earth La grains are added before the medium carbon ferromanganese is added.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following steps of: using a natural decarbonization mode, the target endpoint carbon is 0.02%; adjusting molten steel components, adjusting manganese by using low-carbon ferromanganese, and referencing the absorptivity Mn of 90%; oxygen was supplied after the decarburization was completed, and aluminum pellets were used for deoxidation according to the oxygen supply condition, 3ppm was used for deoxidation per 1Kg of aluminum, and the oxygen activity was controlled at 30ppm.
The production method of the ultra-low carbon flexible wire steel SWRM6, wherein the LF procedure comprises the following steps: adding a slag former to form slag, determining the treatment time according to the sulfur content and the temperature of molten steel, wherein the slag layer is required to be thicker and has good fluidity, and the slag former adopts a rare earth calcium oxide slag system of 25 percent La 2 O 3 +25％CaO+50％CaF 2 。
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following continuous casting and rolling steps: maintaining the liquid level of the high-middle ladle for casting, wherein the liquid level is 900mm in the process, and maintaining the liquid level stable;
using a Mg-Ca dry material tundish, performing full protection casting, blowing argon into the tundish for casting, and tightly prohibiting the addition of a covering agent into an impact area of the tundish when a large ladle of protective sleeve is not sleeved, wherein the argon flow of the large ladle of protective sleeve is 45L/min, and the tundish uses a low-carbon high-alkalinity covering agent;
controlling the superheat degree of the big ladle at 18 ℃, adopting automatic liquid level control, keeping the liquid level of the crystallizer stable, and stabilizing the target working pull speed at 2.4m/min;
when continuous casting is stopped, the casing is firstly stopped and then is removed, and bare casting is strictly forbidden.
Comparative example 1
As in example 1, la was not added in the electric furnace step, but 25% La2O3+25% CaO +50% CaF2 was used as the rare earth calcium oxide slag system, and CaO-Si0 was used 2 -A1 2 0 3 -MgO-CaF 2 And (5) slag system.
Comparative example 2
The method is the same as the rest of the example 1, the superheat degree in the continuous casting process is 35 ℃, and the working pulling speed is stabilized at 1.5m/min.
Comparative example 3
An ultra-low carbon flexible wire steel SWRM6, wherein the composition of the ultra-low carbon flexible wire steel is shown in table 1.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the steps of electric furnace smelting, RH furnace deoxidization and decarburization, LF refining, continuous casting and rolling, drawing and warehousing.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following electric furnace smelting steps: in order to reduce the initial carbon content, the iron ratio of the furnace is 16 percent, and low-carbon clean scrap steel is adopted; endpoint carbon 0.07%, endpoint S less than or equal to 0.035%, endpoint phosphorus less than or equal to 0.015%; and (3) tapping 8 for weak deoxidization, wherein a deoxidizer is not added, only 1.1kg/t of medium carbon ferromanganese is added, and rare earth La grains are added before the medium carbon ferromanganese is added.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following steps of: using a natural decarbonization mode, the target endpoint carbon is 0.05%; adjusting molten steel components, adjusting manganese by using low-carbon ferromanganese, and ensuring that the absorptivity Mn is 90%; oxygen was supplied after the decarburization was completed, and aluminum pellets were used for deoxidation according to the oxygen supply condition, 3ppm was used for deoxidation per 1Kg of aluminum, and the oxygen activity was controlled at 30ppm.
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following steps of: adding a slag former to form slag, determining the treatment time according to the sulfur content and the temperature of molten steel, wherein the slag layer is required to be thicker and has good fluidity, and the slag former adopts a rare earth calcium oxide slag system of 25 percent La 2 O 3 +25％CaO+50％CaF 2 。
The production method of the ultra-low carbon flexible wire steel SWRM6 comprises the following continuous casting and rolling steps: maintaining the liquid level of the high-middle ladle for casting, wherein the liquid level is 850mm in the process, and maintaining the liquid level stable;
using a Mg-Ca dry material tundish, performing full protection casting, blowing argon into the tundish for casting, and tightly prohibiting the addition of a covering agent into an impact area of the tundish when a large ladle of protective sleeve is not sleeved, wherein the argon flow of the large ladle of protective sleeve is 45L/min, and the tundish uses a low-carbon high-alkalinity covering agent;
controlling the superheat degree of the big ladle at 23 ℃, adopting automatic liquid level control, keeping the liquid level of the crystallizer stable, and stabilizing the target working pull speed at 2.6m/min;
when continuous casting is stopped, the casing is firstly stopped and then is removed, and bare casting is strictly forbidden.
TABLE 1 ultra Low carbon Soft wire Steel SWRM6 examples and comparative examples
As can be seen from Table 1, the invention obtains products with grain size of 9.5-10 and small slag inclusion amount by reasonably matching the component optimization combination process and adjusting procedures of proportioning, electric furnace, RH, LF, continuous casting and the like, greatly reduces the wire breakage rate of drawing, reaches 3-5 times/hundred tons, and realizes the excellent performance of the elongation A11.3 after breaking of more than 33% on the basis of obtaining ultra-low carbon.
Other specific implementation parameters of the invention are possible, and all technical schemes formed by equivalent substitution or equivalent transformation are within the scope of the invention.
Claims (5)
1. An ultra-low carbon flexible wire steel SWRM6, characterized in that the ultra-low carbon flexible wire steel comprises the following components: less than or equal to 0.04 percent of C, less than or equal to 0.03 percent of Si, 0.10 to 0.23 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, 0.008 to 0.012 percent of La, the balance of Fe and unavoidable impurities,the grain size of the ultra-low carbon flexible wire steel SWRM6 is 9.5-10, the wire breakage rate of drawing is 3-5 times/hundred tons, the elongation A11.3 after breaking is more than 33%, the production method of the ultra-low carbon flexible wire steel SWRM6 comprises the steps of electric furnace smelting, RH furnace deoxidization and decarbonization, LF refining, continuous casting and rolling, drawing and warehousing, wherein the electric furnace process comprises the following steps: in order to reduce the initial carbon content, the charging iron ratio is 15-20%, and low-carbon clean scrap steel is adopted; endpoint carbon 0.05 plus or minus 0.01%, endpoint S less than or equal to 0.035%, endpoint phosphorus less than or equal to 0.015%; and (3) tapping is weakly deoxidized, no deoxidizer is added, only 1.5kg/t of medium-carbon ferromanganese is added, and rare earth La grains are added before the medium-carbon ferromanganese is added, wherein the deoxidizing and decarbonizing process of the RH furnace comprises the following steps: using a natural decarburization mode, wherein the target endpoint carbon is 0.02-0.04%; adjusting molten steel components, adjusting manganese by using low-carbon ferromanganese, and referencing the absorptivity Mn of 90%; oxygen is fixed after decarburization, aluminum particles are used for deoxidizing according to the oxygen fixing condition, 3ppm is deoxidized per 1Kg of aluminum, and the oxygen activity is controlled to be 20-35ppm, wherein the LF procedure comprises: adding a slag former to form slag, determining the treatment time according to the sulfur content and the temperature of molten steel, wherein the slag layer is required to be thicker and has good fluidity, and the slag former adopts a rare earth calcium oxide slag system of 25 percent La 2 O 3 +25％CaO+50％CaF 2 Wherein, continuous casting and rolling process includes: maintaining the liquid level of the high school bag for casting, wherein the liquid level is 800-900mm in the process, and maintaining the liquid level stable; using a Mg-Ca dry material tundish, performing full protection casting, blowing argon into the tundish for casting, and performing argon flow of a large ladle protection sleeve at 30-50L/min, wherein when no sleeve is added, adding a covering agent into an impact area of the tundish is strictly forbidden, and the tundish uses a low-carbon high-alkalinity covering agent; controlling the superheat degree of the big ladle at 15-25 ℃, adopting automatic liquid level control, keeping the liquid level of the crystallizer stable, and stabilizing the target working pull speed within the range of 2.4-2.8 m/min; when continuous casting is stopped, the casing is firstly stopped and then is removed, and bare casting is strictly forbidden.
2. The ultra-low carbon flexible wire steel SWRM6 according to claim 1, wherein the ultra-low carbon flexible wire steel has the composition: 0.02-0.03% of C, 0.015-0.02% of Si, 0.15-0.2% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.009-0.01% of La and the balance of Fe and unavoidable impurities.
3. A method for producing an ultra-low carbon flexible wire steel SWRM6 according to any one of claims 1 to 2, wherein the method comprises electric furnace smelting, RH furnace deoxidization and decarburization, LF refining, continuous casting and rolling, drawing, and warehousing.
4. The production method according to claim 3, wherein,
the electric furnace procedure comprises the following steps: in order to reduce the initial carbon content, the charging iron ratio is 15-20%, and low-carbon clean scrap steel is adopted; endpoint carbon 0.05 plus or minus 0.01%, endpoint S less than or equal to 0.035%, endpoint phosphorus less than or equal to 0.015%; the tapping is weakly deoxidized, no deoxidizer is added, only 1.5kg/t of medium carbon ferromanganese is added, and rare earth La grains are added before the medium carbon ferromanganese is added; the RH furnace deoxidizing and decarbonizing process comprises the following steps: using a natural decarburization mode, wherein the target endpoint carbon is 0.02-0.04%; adjusting molten steel components, adjusting manganese by using low-carbon ferromanganese, and referencing the absorptivity Mn of 90%; oxygen is fixed after decarburization, aluminum particles are used for deoxidizing according to the oxygen fixing condition, 3ppm of aluminum is deoxidized every 1Kg of aluminum, and the oxygen activity is controlled to be 20-35ppm;
the LF procedure comprises the following steps: adding a slag former to form slag, determining the treatment time according to the sulfur content and the temperature of molten steel, wherein the slag layer is required to be thicker and has good fluidity, and the slag former adopts rare earth calcium oxide slag system' 25 percent La 2 O 3 +25％CaO+50％CaF 2 ”；
The continuous casting and rolling process comprises the following steps: maintaining the liquid level of the high school bag for casting, wherein the liquid level is 800-900mm in the process, and maintaining the liquid level stable; using a Mg-Ca dry material tundish, performing full protection casting, blowing argon into the tundish for casting, and performing argon flow of a large ladle protection sleeve at 30-50L/min, wherein when no sleeve is added, adding a covering agent into an impact area of the tundish is strictly forbidden, and the tundish uses a low-carbon high-alkalinity covering agent; controlling the superheat degree of the big ladle at 15-25 ℃, adopting automatic liquid level control, keeping the liquid level of the crystallizer stable, and stabilizing the target working pull speed within the range of 2.4-2.8 m/min; when continuous casting is stopped, the casing is firstly stopped and then is removed, and bare casting is strictly forbidden.
5. The production method according to claim 4, wherein the ultra-low carbon flexible wire steel comprises the following components: 0.02% of C, 0.016% of Si, 0.18% of Mn, 0.01% of P, 0.012% of S, 0.012% of La and the balance of Fe and unavoidable impurities; the ultra-low carbon flexible wireThe method for producing the steel SWRM6 comprises the steps of electric furnace smelting, RH furnace deoxidization and decarburization, LF refining, continuous casting and rolling, drawing and warehousing, wherein the electric furnace smelting process comprises the following steps: in order to reduce the initial carbon content, the iron ratio of the furnace is 16 percent, and low-carbon clean scrap steel is adopted; endpoint carbon 0.04%, endpoint S less than or equal to 0.035%, endpoint phosphorus less than or equal to 0.015%; the tapping is weakly deoxidized, no deoxidizer is added, only 1.5kg/t of medium carbon ferromanganese is added, and rare earth La grains are added before the medium carbon ferromanganese is added; wherein, the RH furnace deoxidizing and decarbonizing process comprises the following steps: using a natural decarbonization mode, the target endpoint carbon is 0.02%; adjusting molten steel components, adjusting manganese by using low-carbon ferromanganese, and referencing the absorptivity Mn of 90%; oxygen is fixed after decarburization, aluminum particles are used for deoxidizing according to the oxygen fixing condition, 3ppm of aluminum is deoxidized every 1Kg of aluminum, and the oxygen activity is controlled at 30ppm; wherein, the LF refining procedure includes: adding a slag former to form slag, determining the treatment time according to the sulfur content and the temperature of molten steel, wherein the slag layer is required to be thicker and has good fluidity, and the slag former adopts a rare earth calcium oxide slag system of 25 percent La 2 O 3 +25％CaO+50％CaF 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, continuous casting and rolling processes comprise: maintaining the liquid level of the high-middle ladle for casting, wherein the liquid level is 850mm in the process, and maintaining the liquid level stable; using a Mg-Ca dry material tundish, performing full protection casting, blowing argon into the tundish for casting, and tightly prohibiting the addition of a covering agent to an impact area of the tundish when a large ladle is not sleeved, wherein the tundish uses a low-carbon high-alkalinity covering agent, controls the superheat degree of the large ladle at 23 ℃, adopts automatic liquid level control, keeps the liquid level of a crystallizer stable, and ensures that the target working pulling speed is stabilized at 2.6m/min; when continuous casting is stopped, the casing is firstly stopped and then is removed, and bare casting is strictly forbidden.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310407728.5A CN116411226B (en) | 2023-04-17 | 2023-04-17 | Ultra-low carbon flexible wire steel SWRM6 and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310407728.5A CN116411226B (en) | 2023-04-17 | 2023-04-17 | Ultra-low carbon flexible wire steel SWRM6 and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116411226A CN116411226A (en) | 2023-07-11 |
| CN116411226B true CN116411226B (en) | 2024-04-12 |
Family
ID=87059337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310407728.5A Active CN116411226B (en) | 2023-04-17 | 2023-04-17 | Ultra-low carbon flexible wire steel SWRM6 and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116411226B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001207250A (en) * | 2000-01-27 | 2001-07-31 | Nippon Steel Corp | Hot-dip plated steel wire with high corrosion resistance, and its manufacturing method |
| JP2005139491A (en) * | 2003-11-05 | 2005-06-02 | Nippon Steel Corp | Steel sheet with excellent surface characteristic, formability and workability, and its manufacturing method |
| CN104498727A (en) * | 2014-12-31 | 2015-04-08 | 北京北冶功能材料有限公司 | Slag system for electro-slag remelting |
| JP2016222970A (en) * | 2015-05-29 | 2016-12-28 | 新日鐵住金株式会社 | Superclean steel and method of refining the same |
| CN110643887A (en) * | 2019-10-17 | 2020-01-03 | 中天钢铁集团有限公司 | Ultra-low carbon steel for deep drawing and production process thereof |
| CN112058912A (en) * | 2020-09-09 | 2020-12-11 | 广东韶钢松山股份有限公司 | Ultra-low carbon steel wire rod and steel wire and preparation method thereof |
| CN114672728A (en) * | 2022-03-11 | 2022-06-28 | 钢铁研究总院有限公司 | Rare earth-containing corrosion-resistant steel and method for controlling content and existing form of rare earth |
| CN115537504A (en) * | 2021-06-29 | 2022-12-30 | 宝山钢铁股份有限公司 | Preparation method of titanium-containing ultra-low carbon steel |
-
2023
- 2023-04-17 CN CN202310407728.5A patent/CN116411226B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001207250A (en) * | 2000-01-27 | 2001-07-31 | Nippon Steel Corp | Hot-dip plated steel wire with high corrosion resistance, and its manufacturing method |
| JP2005139491A (en) * | 2003-11-05 | 2005-06-02 | Nippon Steel Corp | Steel sheet with excellent surface characteristic, formability and workability, and its manufacturing method |
| CN104498727A (en) * | 2014-12-31 | 2015-04-08 | 北京北冶功能材料有限公司 | Slag system for electro-slag remelting |
| JP2016222970A (en) * | 2015-05-29 | 2016-12-28 | 新日鐵住金株式会社 | Superclean steel and method of refining the same |
| CN110643887A (en) * | 2019-10-17 | 2020-01-03 | 中天钢铁集团有限公司 | Ultra-low carbon steel for deep drawing and production process thereof |
| CN112058912A (en) * | 2020-09-09 | 2020-12-11 | 广东韶钢松山股份有限公司 | Ultra-low carbon steel wire rod and steel wire and preparation method thereof |
| CN115537504A (en) * | 2021-06-29 | 2022-12-30 | 宝山钢铁股份有限公司 | Preparation method of titanium-containing ultra-low carbon steel |
| CN114672728A (en) * | 2022-03-11 | 2022-06-28 | 钢铁研究总院有限公司 | Rare earth-containing corrosion-resistant steel and method for controlling content and existing form of rare earth |
Non-Patent Citations (1)
| Title |
|---|
| 中国冶金百科全书总编辑委员会《金属材料卷》编辑委员会编.《中国冶金百科全书 金属材料》.冶金工业出版社,2001,第153页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116411226A (en) | 2023-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP7416542B2 (en) | Method for manufacturing steel wire, wire rod for steel wire, and wire rod for steel wire | |
| CN110055459B (en) | Medium-alloy ultrahigh-strength-toughness rare earth steel and preparation method thereof | |
| WO2023056792A1 (en) | Magnesium-containing steel 45 and preparation process therefor | |
| CN101054647A (en) | Method of producing low-temperature high-toughness steel and steel plate | |
| CN109161632B (en) | Production method for controlling large-size hard inclusions in spring steel wire rod | |
| CN109082588B (en) | CrMo round bar quenched and tempered steel and preparation method thereof | |
| CN114318154A (en) | High-cleanliness welding wire steel L-S3 and preparation method thereof | |
| CN111286677B (en) | Ultralow-sulfur low-aluminum high-nitrogen steel and smelting method | |
| CN105543644A (en) | Novel manufacturing technology of super-large size gear steel SCM822H for industrial speed reducer | |
| WO2023098919A1 (en) | Manufacturing method for low-carbon nitrogen-containing austenitic stainless steel bar | |
| CN104988400A (en) | Titanium-microalloyed boron-containing steel and smelting method thereof | |
| CN114378480A (en) | Large-heat-input submerged-arc welding wire steel wire rod and preparation method thereof, large-heat-input submerged-arc welding wire and large-heat-input welding method | |
| CN103225009B (en) | Method for producing high-cleanness steel | |
| CN109536840B (en) | Continuous casting high-quality die steel improved by micro-magnesium treatment and preparation method thereof | |
| CN116411226B (en) | Ultra-low carbon flexible wire steel SWRM6 and preparation method thereof | |
| CN111321322A (en) | Ni-Cr-Nb-Fe alloy having excellent internal quality and hot workability, and method for producing same | |
| CN111471936A (en) | Improved steel for agricultural machinery cutting tool and production method thereof | |
| CN106521332A (en) | Steel plate for resisting hydrogen cracking by stress and production method thereof | |
| CN114855083A (en) | Preparation method of hot-rolled round steel for 25Mn forging | |
| CN112609035A (en) | Production method of cold-resistant steel for automobile structural pipe | |
| CN111112594B (en) | Stopper rod for pouring low-carbon low-alloy steel and steelmaking process using stopper rod | |
| CN114293101A (en) | Economical high-grade welding wire steel H04E and preparation method thereof | |
| CN117701998B (en) | 500 MPa-level steel plate for ocean engineering and preparation method thereof | |
| CN115584435B (en) | High-strength steel for cold extrusion molding of heavy cross shaft and preparation method thereof | |
| CN115287545B (en) | Q195L cold heading steel wire rod for fastener and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |