CN110129508A - A kind of technique improving rare earth high-strength steel impact flexibility - Google Patents
A kind of technique improving rare earth high-strength steel impact flexibility Download PDFInfo
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- CN110129508A CN110129508A CN201910435594.1A CN201910435594A CN110129508A CN 110129508 A CN110129508 A CN 110129508A CN 201910435594 A CN201910435594 A CN 201910435594A CN 110129508 A CN110129508 A CN 110129508A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 95
- 239000010959 steel Substances 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 35
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 239000002893 slag Substances 0.000 claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims abstract description 24
- 238000007670 refining Methods 0.000 claims abstract description 22
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 20
- 239000000956 alloy Substances 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000009749 continuous casting Methods 0.000 claims abstract description 14
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 7
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 230000001133 acceleration Effects 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 44
- 230000008569 process Effects 0.000 claims description 23
- 238000005496 tempering Methods 0.000 claims description 22
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 19
- 238000010079 rubber tapping Methods 0.000 claims description 18
- 238000002791 soaking Methods 0.000 claims description 18
- 229910052717 sulfur Inorganic materials 0.000 claims description 13
- 230000009467 reduction Effects 0.000 claims description 11
- 229910052786 argon Inorganic materials 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 229910052720 vanadium Inorganic materials 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000010926 purge Methods 0.000 claims description 4
- 238000010583 slow cooling Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 claims description 2
- 230000023556 desulfurization Effects 0.000 claims description 2
- 238000005272 metallurgy Methods 0.000 claims description 2
- 239000013078 crystal Substances 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 6
- 229910001566 austenite Inorganic materials 0.000 abstract description 4
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 abstract description 4
- 238000011160 research Methods 0.000 abstract description 4
- 230000007704 transition Effects 0.000 abstract description 4
- 208000037656 Respiratory Sounds Diseases 0.000 abstract description 2
- 239000010813 municipal solid waste Substances 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical group OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- GSVIBLVMWGSPRZ-UHFFFAOYSA-N cerium iron Chemical compound [Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Ce].[Ce] GSVIBLVMWGSPRZ-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000001976 improved effect Effects 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000896693 Disa Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000011009 performance qualification Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
-
- 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
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
- C21D8/0215—Rapid solidification; Thin strip casting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of techniques for improving rare earth high-strength steel impact flexibility, include the following steps: KR desulphurization and slag skimming → converter smelting → LF refining → RH refining and rare earth treatment → continuous casting → heating → rolling → acceleration cooling → heat treatment.The present invention is directed to the influence in the presence of rare earth to low-alloy high-strength steel heterogeneous microstructure, research, which obtains cerium Ce, can improve the form and purification crystal boundary of field trash, improve the intensity of crystal boundary, reduce the possibility that crackle is extended by the perforation of defect, to improve impact flexibility, austenite grain boundary can also be refined so as to improve impact flexibility, while adding cerium Ce can make the ductile-brittle transition temperature of steel reduce by 10 DEG C or so.
Description
Technical field
The present invention relates to heat treatment cut deal technical fields, more particularly, to a kind of raising rare earth high-strength steel impact flexibility
Technique.
Background technique
High-tensile structural steel is widely used in coal mine machinery, engineering machinery, such as hydraulic support, portal crane, plate fortune
Defeated vehicle etc. is required to have high-intensitive and preferable low-temperature impact toughness.Therefore, many scientific research personnel are dedicated to improving in recent years
The obdurability of high-strength steel improves its impact flexibility on the basis of guaranteeing high-intensitive to obtain comprehensive mechanical performance more carefully
High strength steel plate.Current most of iron and steel enterprises use out-line quenching+high tempering hardening and tempering process, are air-cooled to room after tempering
Temperature.
Characteristic resources of the rare earth element as Baotou region are also obviously improved effect to steel impact flexibility, with
Steel industry went the promotion of production capacity and transition and upgrade in recent years, played rare earth resources advantage, the market position for improving rare earth steel must
So become important topic, current research is limited to illustrate the independent role that RE Modified is mingled with or emphasizes rare earth element more.
Summary of the invention
The present invention is directed to the influence in the presence of rare earth to low-alloy high-strength steel heterogeneous microstructure, and research obtains cerium Ce
The form and purification crystal boundary that field trash can be improved, improve the intensity of crystal boundary, reduce what crackle was extended by the perforation of defect
May, to improve impact flexibility, austenite grain boundary can also be refined so as to improve impact flexibility, while adding cerium Ce energy
Enough making the ductile-brittle transition temperature of steel reduces by 10 DEG C or so.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
It is a kind of improve rare earth high-strength steel impact flexibility technique, include the following steps: KR desulphurization and slag skimming → converter smelting →
LF refining → RH refining and rare earth treatment → continuous casting → heating → rolling → acceleration cooling → heat treatment；
Wherein:
KR desulfurization and converter smelting include: molten steel sulfur content S≤0.010% after molten iron pretreatment, temperature >=1280 DEG C.Iron
Water takes off slag completely before entering converter, and converter terminal controls C-T and coordinates tapping, and P≤0.010%, S≤0.015%, tap time 4-
7min, tapping 1/5 when be added；Ferro-aluminum is added to carry out deoxidation to molten steel, the alloy in addition to Al is added by normal requirement, tapping 2/5
Amount adds alloy, and suitable modification agent and lime is added in view terminal oxygen content in tapping process；
External refining includes: that the refining of LF furnace uses Oxides Metallurgy Technology to carry out slag making and deoxidation operation to molten steel, quickly
White slag is made, and guarantees white slag time 15min or more, stablizes basicity of slag；Alloy is wanted with adding to target as far as possible before LF refining is outbound
Range is sought, guarantees that S content is lower than 0.003%, B-Fe=0.018-0.020 is added after feeding silk Argon 5min；
RH refining and rare earth treatment include: RH not adjusting component as far as possible, and all the components adjustment will be completed in LF, at RH vacuum
Rare earth alloy is added for 15-17 minutes in reason in feed bin, and rare earth alloy additional amount is 35kg/ furnace, and RH depth vacuum is followed after rare earth is added
The ring time guarantees 15min or more, and the argon gas soft blow time guarantees 10min or more.
Continuous casting includes: to strengthen to guarantee airtightness and middle packet liquid level coverture thickness between big packet-middle packet-crystallizer, is strengthened
Middle packet argon gas purging, avoids air-breathing in continuous casting process, and whole process increases the control of N amount within 5ppm；1520 DEG C of liquidus curve, middle packet overheat
Degree controls 23-33 DEG C, and plate slab production pulling rate executes stable state casting in pulling speed of continuous casting use, and production thickness of strand 250mm connects
Casting is whole to carry out protective casting；
Heating includes: 1220-1260 DEG C of heating temperature, and slab center portion temperature of coming out of the stove is greater than 1180 DEG C, it is ensured that soaking zone is protected
Temperature >=40 minutes, guarantees that steel billet is grilled thoroughly, uniformly；
Rolling mill practice includes: two stages controlled rolling, and a stage start rolling temperature is greater than 1100 DEG C, reduction ratio 60%~70%；Two
860~900 DEG C of stage start rolling temperature, >=12%, last three passage adds up reduction ratio and is not less than >=40% reduction ratio per pass；
Roll rear water cooling: 650~750 DEG C of final cooling temperature, stacking slow cooling；
Heat treatment process includes: for quenching+tempering, and hardening heat is 910 ± 10 DEG C, and time inside furnace is according to t=1.4min
× thickness+soaking time calculates, and thickness unit is mm, is air-cooled to room temperature after quenching；600-640 DEG C of tempering temperature, time inside furnace
It is calculated according to t=2.6min × thickness+soaking time, sprays surface of steel plate using high pressure water after tempering, steel billet temperature is down to 300
DEG C or less come out of the stove；Thickness unit is mm.
Further, the high-strength steel includes following chemical component: C=0.08-0.15%, Si=by mass percentage
0.3-0.5%, Mn=1.5-1.8%, P≤0.015%, S≤0.015%, Als=0.015-0.03%, Cr=0.2-
0.3%, V=0.4-0.8%, Ti=0.01-0.02%, Nb=0.03-0.06%, Mo=0.2-0.3%, Ce >=
0.0003ppm, remaining is Fe and inevitable impurity.
Further, the high-strength steel includes following chemical component: C=0.14%, Si=by mass percentage
0.32%, Mn=1.5%, P=0.013%, S=0.002%, Als=0.023%, V=0.43%, Ti=0.014, Cr=
0.25%, Nb=0.044%, Mo=0.244, Ce=0.0005ppm, remaining is Fe and inevitable impurity.
Further, glowing furnace holding temperature is 910 DEG C or so in heat treatment process, and soaking time is greater than 20 minutes.
Further, tempering furnace holding temperature is 400 DEG C or more in heat treatment process, and soaking time is greater than 10 minutes.
Further, heat treatment process light plate temperature be down to 300 DEG C or less come out of the stove after it is air-cooled.
Compared with prior art, advantageous effects of the invention:
The present invention passes through addition rare earth element first, improves crystal boundary, strengthens the austenite grain boundary of temper embrittlement state, prevents
What impact generated under low-temperature condition prolongs intercrystalline cracking, effectively improves the impact flexibility of steel；Meanwhile high pressure water jets are used after tempering
Surface of steel plate is spilt, steel billet temperature is quickly reduced, due to having refined austenite grain and crystal boundary is made to be serrated, increases crystal boundary face
Product, when tempering, alleviate pollution of the magazines such as carbon and nitrogen, phosphorus to crystal boundary, so as to mitigate temper brittleness.
This method improves the low-temperature impact toughness of steel plate by adding rare earth element, secondly by after tempering that steel plate is fast
Quickly cooling but, by rare earth element is solidificated in boundary surfaces, can not only effectively reduce the ductile-brittle transition temperature of steel plate, and effectively
Inhibition temper brittleness, while improving the low-temperature impact toughness of steel plate, the performance for increasing high-strength steel steel plate is steady
It is qualitative, substantially improving performance qualification rate.
Detailed description of the invention
Fig. 1 is high-strength steel impact fracture schematic diagram in embodiment 1；
Fig. 2 is metallographic structure schematic diagram at high-strength steel center in embodiment 1；
Fig. 3 is metallographic structure schematic diagram at high-strength steel center in embodiment 2.
Specific embodiment
Embodiment 1
Produce 690MPa grades of high strength steel plate production technologies, the composition quality percentage composition of steel are as follows: C=0.14%, Si=
0.32%, Mn=1.5%, P=0.013%, S=0.002%, Als=0.023%, Nb=0.044%, V=0.043%, Ti
=0.014%, Cr=0.41%, Mo=0.244%, Ce=0.0005ppm；
Main technological steps and parameter are as follows:
Molten iron pretreatment must first be carried out by entering furnace molten iron, molten steel sulfur content s≤0.010% after processing, temperature >=1250 DEG C,
Molten iron must take off slag completely before entering converter, and molten iron and steel scrap is added in converter steelmaking process, and molten iron and steel scrap proportion are molten iron
85% or so, steel scrap 15% or so.Converter terminal controls C-T and coordinates tapping, P≤0.012%, S≤0.015%, stringent pushing off the slag
Tapping, tap time 4-7min, and when tapping 1/5 is added alloy, and 2/5 amount of tapping adds alloy, contains in tapping process depending on terminal oxygen
Suitable modification agent and lime is added in amount, and oxygen is no less than 250m, and is fitted depending on the variation of charge weight, terminal C, molten steel oxidation
Work as adjustment, molten steel is then transported to LF refining furnace and carries out refining operation.
LF refining carries out molten steel to make white slag and deoxidation operation, it is ensured that the content of the elements such as oxygen, sulphur is controlled lower in steel
Level, quickly make white slag, and guarantee white slag time 15min or more, stablize basicity of slag；Alloy is matched as far as possible before LF refining is outbound
Target call range is added to, OT≤20ppm, N≤40ppm guarantee that S content is lower than 0.003%.
Rare earth alloy is added after 4 minutes in RH application of vacuum in feed bin, and 10% cerium-iron alloy, additional amount 31.5 is added
Kilogram/furnace, the RH depth vacuum cycle time guarantees 15min or more after rare earth is added, and the argon gas soft blow time guarantees 10min or more.
1520 DEG C of the steel grade liquidus curve, the middle packet degree of superheat control 23-33 DEG C, and plate slab produces pulling rate in pulling speed of continuous casting use
Stable state casting is executed, thickness of strand 250mm is produced, continuous casting whole process carries out protective casting；Strengthen big packet-middle packet-crystallizer it
Between guarantee airtightness and middle packet liquid level coverture thickness, packet argon gas purging, prevents molten steel secondary oxidation and nitrogen pick-up in reinforcing.It is offline
Slab progress 24 hours or more heaps are cold.
Heating cycle: bringing-up section temperature is not higher than 1260 DEG C, 1220 DEG C~1260 DEG C of soaking temperature, it is ensured that soaking zone heat preservation
>=40 minutes, guarantee that steel billet is grilled thoroughly, uniformly.Rolling mill practice: two stages controlled rolling, a stage start rolling temperature are greater than 1100 DEG C, pressure
Rate 60%~70%；860~900 DEG C of two-stage rolling temperature, >=12%, last three passage is accumulative to be depressed reduction ratio per pass
Rate is not less than >=40%；Roll rear water cooling, 650~750 DEG C of final cooling temperature, stacking slow cooling.To reduce steel internal defect defect, fit
When increasing roughing single pass rolling reduction, after rolling in the case where guaranteeing template, raising cooling rate is controlled by accelerating cooling as far as possible
Phase-change organization refines crystal grain, carries out tissue preparation for subsequent modifier treatment.
Heat treatment: output finished product walks heat treatment process after precisely cutting.Steel plate is through shot-blasting machine to eliminate surface of steel plate
Iron scale；Through roller hearth type non-oxidation glowing furnace, glowing furnace holding temperature is 910 DEG C or so, and soaking time is greater than 20 minutes, is protected
It is accurate to demonstrate,prove temperature control, homogeneous heating, steel plate non-oxidation；Through roller-bottom type tempering furnace, tempering furnace holding temperature is 400 DEG C or more,
Soaking time is greater than 10 minutes, should ensure that temperature control is accurate in heat treatment process, homogeneous heating.High pressure water jets are used after tempering
Spill surface of steel plate, steel billet temperature be down to 300 DEG C or less come out of the stove after it is air-cooled.
The plate property produced according to the above technical scheme such as table 1:
1 mechanical property representative value of table
- 40 DEG C of Charpy-type tests are done by the high-strength steel steel plate that the technical program produces, low-temperature impact fracture is disconnected for toughness
Mouthful, as shown in Figure 1.Metallographic microstructure is as shown in Fig. 2, can be seen that tissue from metallographic microstructure is tempered sorbite group
It knits, even tissue, is typical quenching+tempering tissue.It can also be seen that the steel plate complete through hardening.
Embodiment 2
Produce 690MPa grades of high strength steel plate production technologies, the composition quality percentage composition of steel are as follows: C=0.13, Si=0.31,
Mn=1.51, P=0.013, S=0.002, Al=0.023, Nb=0.042, V=0.044, Ti=0.013, Cr=0.41, Mo
=0.247, Ce=0.0003ppm.
Main technological steps and parameter are as follows:
Molten iron pretreatment must first be carried out by entering furnace molten iron, molten steel sulfur content s≤0.010% after processing, temperature >=1250 DEG C,
Molten iron must take off slag completely before entering converter, and molten iron and steel scrap is added in converter steelmaking process, and molten iron and steel scrap proportion are molten iron
85% or so, steel scrap 15% or so.Converter terminal controls C-T and coordinates tapping, P≤0.012%, S≤0.015%, stringent pushing off the slag
Tapping, tap time 4-7min, and when tapping 1/5 is added alloy, and 2/5 amount of tapping adds alloy, contains in tapping process depending on terminal oxygen
Suitable modification agent and lime is added in amount, and oxygen is no less than 250m, and is fitted depending on the variation of charge weight, terminal C, molten steel oxidation
Work as adjustment, molten steel is then transported to LF refining furnace and carries out refining operation.
LF refining carries out molten steel to make white slag and deoxidation operation, it is ensured that the content of the elements such as oxygen, sulphur is controlled lower in steel
Level, quickly make white slag, and guarantee white slag time 15min or more, stablize basicity of slag；Alloy is matched as far as possible before LF refining is outbound
Target call range is added to, OT≤20ppm, N≤40ppm guarantee that S content is lower than 0.003%.
Rare earth alloy is added after 4 minutes in RH application of vacuum in feed bin, and 10% cerium-iron alloy, additional amount 31.5 is added
Kilogram/furnace, the RH depth vacuum cycle time guarantees 15min or more after rare earth is added, and the argon gas soft blow time guarantees 10min or more.
1520 DEG C of the steel grade liquidus curve, the middle packet degree of superheat control 23-33 DEG C, and plate slab produces pulling rate in pulling speed of continuous casting use
Stable state casting is executed, thickness of strand 250mm is produced, continuous casting whole process carries out protective casting；Strengthen big packet-middle packet-crystallizer it
Between guarantee airtightness and middle packet liquid level coverture thickness, packet argon gas purging, prevents molten steel secondary oxidation and nitrogen pick-up in reinforcing.It is offline
Slab progress 24 hours or more heaps are cold.
Heating cycle: bringing-up section temperature is not higher than 1260 DEG C, 1220 DEG C~1260 DEG C of soaking temperature, it is ensured that soaking zone heat preservation
>=40 minutes, guarantee that steel billet is grilled thoroughly, uniformly.
Rolling mill practice: two stages controlled rolling, a stage start rolling temperature are greater than 1100 DEG C, reduction ratio 60%~70%；Two-stage
860~900 DEG C of start rolling temperature, >=12%, last three passage adds up reduction ratio and is not less than >=40% reduction ratio per pass；After rolling
Water cooling, 650~750 DEG C of final cooling temperature, stacking slow cooling.It is appropriate to increase roughing single pass pressure to reduce steel internal defect defect
Lower amount, after rolling in the case where guaranteeing template, raising cooling rate controls phase-change organization by acceleration cooling as far as possible, refines crystal grain,
Tissue is carried out for subsequent modifier treatment to prepare.
Heat treatment: output finished product walks heat treatment process through precisely cutting.Steel plate is through DISA shot-blasting machine to eliminate surface of steel plate
Iron scale；Through LOI roller hearth type non-oxidation glowing furnace, glowing furnace holding temperature is 910 DEG C or so, and soaking time is greater than 20 points
Clock guarantees that temperature control is accurate, homogeneous heating, steel plate non-oxidation；Through LOI roller-bottom type tempering furnace, tempering furnace holding temperature is 400
DEG C or more, soaking time is greater than 10 minutes, should ensure that temperature control is accurate in heat treatment process, homogeneous heating.It is used after tempering
High pressure water spray surface of steel plate, steel billet temperature be down to 300 DEG C or less come out of the stove after it is air-cooled.
The plate property produced according to the above technical scheme such as table 2:
2 mechanical property representative value of table
By the high-strength steel steel plate that the technical program produces, metallographic microstructure is as shown in figure 3, can be with from metallographic microstructure
Find out, organizes as tempered sorbite tissue, even tissue, for typical quenching+tempering tissue.
Above example can be seen that the high strength steel plate mechanical property produced using above-mentioned ingredient and technique much higher than country
Standard, meeting requirement embodiment described above of the relevant industries to high-strength steel sheet low-temperature impact toughness is only to of the invention
Preferred embodiment is described, and is not intended to limit the scope of the present invention, without departing from the spirit of the design of the present invention, this
The various changes and improvements that field those of ordinary skill makes technical solution of the present invention should all fall into the claims in the present invention
In the protection scope that book determines.
Claims (6)
1. a kind of technique for improving rare earth high-strength steel impact flexibility, which comprises the steps of: KR desulphurization and slag skimming → turn
Furnace smelting → LF refining → RH refining and rare earth treatment → continuous casting → heating → rolling → acceleration cooling → heat treatment；
Wherein:
KR desulfurization and converter smelting include: molten steel sulfur content S≤0.010% after molten iron pretreatment, and temperature >=1280 DEG C, molten iron enters
Slag is taken off completely before converter, converter terminal controls C-T and coordinates tapping, and P≤0.010%, S≤0.015%, tap time 4-
7min, tapping 1/5 when be added；Ferro-aluminum is added to carry out deoxidation to molten steel, the alloy in addition to Al is added by normal requirement, tapping 2/5
Amount adds alloy, and suitable modification agent and lime is added in view terminal oxygen content in tapping process；
External refining includes: that the refining of LF furnace uses Oxides Metallurgy Technology to carry out slag making and deoxidation operation to molten steel, is quickly made white
Slag, and guarantee white slag time 15min or more, stablize basicity of slag；Alloy is matched as far as possible before LF refining is outbound and adds to target call model
It encloses, guarantees that S content is lower than 0.003%, B-Fe=0.018-0.020 is added after feeding silk Argon 5min；
RH refining and rare earth treatment include: that adjusting component, all the components adjustment will not be completed RH in LF as far as possible, RH application of vacuum
Rare earth alloy is added within 15-17 minutes in feed bin, rare earth alloy additional amount is 35kg/ furnace, RH depth vacuum cycle after rare earth is added
Time guarantees 15min or more, and the argon gas soft blow time guarantees 10min or more；
Continuous casting includes: to strengthen to guarantee airtightness and middle packet liquid level coverture thickness between big packet-middle packet-crystallizer, is wrapped in reinforcing
Argon gas purging, avoids air-breathing in continuous casting process, and whole process increases the control of N amount within 5ppm；1520 DEG C of liquidus curve, middle packet degree of superheat control
23-33 DEG C processed, pulling speed of continuous casting use in plate slab production pulling rate execute stable state casting, produce thickness of strand 250mm, continuous casting is complete
Cheng Shihang protective casting；
Heating includes: 1220-1260 DEG C of heating temperature, and slab center portion temperature of coming out of the stove is greater than 1180 DEG C, it is ensured that and soaking zone heat preservation >=
40 minutes, guarantee that steel billet is grilled thoroughly, uniformly；
Rolling mill practice includes: two stages controlled rolling, and a stage start rolling temperature is greater than 1100 DEG C, reduction ratio 60%~70%；Two-stage
860~900 DEG C of start rolling temperature, >=12%, last three passage adds up reduction ratio and is not less than >=40% reduction ratio per pass；After rolling
Water cooling: 650~750 DEG C of final cooling temperature, stacking slow cooling；
Heat treatment process includes: for quenching+tempering, and hardening heat is 910 ± 10 DEG C, and time inside furnace is according to t=1.4min × thickness
Degree+soaking time calculates, and thickness unit is mm, is air-cooled to room temperature after quenching；600-640 DEG C of tempering temperature, time inside furnace is according to t
=2.6min × thickness+soaking time calculates, and sprays surface of steel plate using high pressure water after tempering, steel billet temperature be down to 300 DEG C with
Under come out of the stove；Thickness unit is mm.
2. the technique according to claim 1 for improving rare earth high-strength steel impact flexibility, which is characterized in that the high-strength steel is pressed
Mass percent includes following chemical component: C=0.08-0.15%, Si=0.3-0.5%, Mn=1.5-1.8%, and P≤
0.015%, S≤0.015%, Als=0.015-0.03%, Cr=0.2-0.3%, V=0.4-0.8%, Ti=0.01-
0.02%, Nb=0.03-0.06%, Mo=0.2-0.3%, Ce >=0.0003ppm, remaining is Fe and inevitable impurity.
3. the technique according to claim 2 for improving rare earth high-strength steel impact flexibility, which is characterized in that the high-strength steel is pressed
Mass percent includes following chemical component: C=0.14%, Si=0.32%, Mn=1.5%, P=0.013%, S=
0.002%, Als=0.023%, V=0.43%, Ti=0.014, Nb=0.044%, Cr=0.25%, Mo=0.244, Ce
=0.0005ppm, remaining is Fe and inevitable impurity.
4. the technique according to claim 1 for improving rare earth high-strength steel impact flexibility, which is characterized in that in heat treatment process
Glowing furnace holding temperature is 910 DEG C or so, and soaking time is greater than 20 minutes.
5. the technique according to claim 4 for improving rare earth high-strength steel impact flexibility, which is characterized in that in heat treatment process
Tempering furnace holding temperature is 400 DEG C or more, and soaking time is greater than 10 minutes.
6. the technique according to claim 5 for improving rare earth high-strength steel impact flexibility, which is characterized in that in heat treatment process
Steel billet temperature be down to 300 DEG C or less come out of the stove after it is air-cooled.
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