CN115216584A - Continuous casting and rolling production process of spring steel wire - Google Patents
Continuous casting and rolling production process of spring steel wire Download PDFInfo
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- CN115216584A CN115216584A CN202210871507.9A CN202210871507A CN115216584A CN 115216584 A CN115216584 A CN 115216584A CN 202210871507 A CN202210871507 A CN 202210871507A CN 115216584 A CN115216584 A CN 115216584A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 120
- 229910000639 Spring steel Inorganic materials 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000009749 continuous casting Methods 0.000 title claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 198
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000010438 heat treatment Methods 0.000 claims abstract description 53
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 36
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 36
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000007670 refining Methods 0.000 claims abstract description 29
- 229910052786 argon Inorganic materials 0.000 claims abstract description 28
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 22
- 230000023556 desulfurization Effects 0.000 claims abstract description 22
- 238000007664 blowing Methods 0.000 claims abstract description 20
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 11
- RGKMZNDDOBAZGW-UHFFFAOYSA-N aluminum calcium Chemical compound [Al].[Ca] RGKMZNDDOBAZGW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 69
- 238000001816 cooling Methods 0.000 claims description 61
- 238000000034 method Methods 0.000 claims description 45
- 230000008569 process Effects 0.000 claims description 43
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 32
- 239000002826 coolant Substances 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 23
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 22
- 239000011777 magnesium Substances 0.000 claims description 22
- 229910052749 magnesium Inorganic materials 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 16
- 235000017550 sodium carbonate Nutrition 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 14
- 238000009987 spinning Methods 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 12
- 239000010703 silicon Substances 0.000 claims description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 9
- 239000001257 hydrogen Substances 0.000 claims description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 239000011574 phosphorus Substances 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 239000003595 mist Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 239000011593 sulfur Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 239000011572 manganese Substances 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 3
- 230000003245 working effect Effects 0.000 abstract 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 12
- 239000011575 calcium Substances 0.000 description 12
- 229910052791 calcium Inorganic materials 0.000 description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 11
- 238000005245 sintering Methods 0.000 description 9
- 229910021532 Calcite Inorganic materials 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 239000002893 slag Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000007667 floating Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000002203 pretreatment Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- XOCUXOWLYLLJLV-UHFFFAOYSA-N [O].[S] Chemical compound [O].[S] XOCUXOWLYLLJLV-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
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- 238000012545 processing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910000521 B alloy Inorganic materials 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- QDMRQDKMCNPQQH-UHFFFAOYSA-N boranylidynetitanium Chemical compound [B].[Ti] QDMRQDKMCNPQQH-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- -1 nitrogen ion Chemical class 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Images
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
- 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
-
- 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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
-
- 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
- B21B1/463—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 in a continuous process, i.e. the cast not being cut before rolling
-
- 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
- C21C7/0025—Adding carbon material
-
- 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
- C21C7/064—Dephosphorising; 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
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C22C38/04—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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a continuous casting and rolling production process of a spring steel wire, which comprises the following steps: pretreating molten iron; sequentially carrying out desiliconization, dephosphorization and desulfurization treatment on the raw materials; a converter combined blowing step; heating the raw materials in a furnace, and adding aluminum, alloy and a carburant into the raw materials; a first refining step; heating the raw materials to 1645-1655 ℃; adding aluminum-calcium wires into the raw materials; argon is blown into the bottom of the raw material; argon flow: 75-150L/min; casting; casting raw materials to form a blank; the discharging temperature of the blank is 1000-1050 ℃; rolling; heating the blank; the blank is sequentially cooled and rolled to form a wire rod. The problem of can't carry out the strict control to each metallic element in the spring copper wire among the current scheme, also can't get rid of impurity simultaneously for spring copper wire working property is relatively poor, seriously influences the finished product quality of spring copper wire is solved.
Description
Technical Field
The invention relates to the field of continuous casting and rolling processes, in particular to a continuous casting and rolling production process of a spring steel wire.
Background
The spring is an important mechanical part, and with the rapid development of the automobile industry in China, the market demand for spring steel is more and more large, and important parts of an automobile engine, such as a valve spring, a suspension spring of a damping system, a clutch spring and the like. When the spring steel hot-rolled wire rod is produced by the traditional process, the spring steel wire rod has poor plasticity and can meet the performance requirement required by cold machining only by annealing. The structural quality of spring steel has a great influence on the fatigue performance of the spring steel, and the fatigue strength and the service life of the spring are influenced. The metal elements in the spring steel wire cannot be strictly controlled, and impurities cannot be removed at the same time, so that the processing performance of the spring steel wire is poor, and the quality of a finished product of the spring steel wire is seriously affected. How to solve this problem becomes crucial.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a continuous casting and rolling process for producing a spring steel wire, so as to solve the problems that in the prior art, each metal element in the spring steel wire cannot be strictly controlled, and impurities cannot be removed, so that the processing performance of the spring steel wire is poor, and the quality of the finished spring steel wire is seriously affected.
In order to realize the purpose, the technical scheme of the invention is as follows:
a continuous casting and rolling production process of a spring steel wire;
the method comprises the following steps:
pretreating molten iron; sequentially carrying out desiliconization, dephosphorization and desulfurization treatment on the raw materials;
a converter combined blowing step; heating the raw materials in a furnace, and adding aluminum, alloy and a carburant into the raw materials;
a first refining step; heating the raw materials to 1645-1655 ℃; adding aluminum-calcium wires into the raw materials; argon is blown into the bottom of the raw material; argon flow: 75-150L/min;
casting; casting raw materials to form a blank; the blank discharging temperature is 1000-1050 ℃;
rolling; heating the blank; and sequentially cooling the blank, and rolling to form the wire rod.
The further technical scheme is as follows: the iron liquid pretreatment comprises the following steps:
desiliconizing treatment: heating the raw materials for the first time; temperature rise: 1320 to 1350 ℃; blowing oxygen to the raw materials for second heating; temperature rise: 1490 to 1510 ℃; the raw material flows into a pretreatment station; adding desiliconization agent into the raw material in the flowing process; after the raw materials flow into the pretreatment station, stirring the raw materials;
dephosphorization treatment: blowing soda ash and sinter into raw materials in a pretreatment station; stirring the raw materials;
and (3) desulfurization treatment: the raw material is sprayed with passivated granular magnesium and desulfurizer.
The further technical scheme is as follows: the combined blown converter comprises:
heating for the first time: heating the raw materials to 1490-1510 ℃; adding aluminum blocks and alloys into the raw materials;
heating for the second time; heating the raw materials to 1605-1615 ℃; adding aluminum particles and a carburant into the raw materials; raw material tapping temperature: 1650 to 1670 ℃.
The further technical scheme is as follows: the first refining step is followed by a second refining step:
heating the raw materials to 1610 to 1630 ℃; vacuumizing in the furnace; vacuum degree: 8-10 Pa; vacuum time: 4-6 min; hydrogen content less than 8.3ppm; the nitrogen content was 35. + -.5 ppm.
The further technical scheme is as follows: before the second refining step, the refining preparation step is also included: controlling the temperature in the furnace: 1500 to 1510 ℃; vacuumizing in the furnace; vacuum degree: 90-100 Pa; the vacuumizing completion time is controlled to be 6-8 min.
The further technical scheme is as follows: the rolling step comprises the following processes:
the first rolling process: heating the blank to 1035-1045 ℃; rolling the blank; cooling the blank to 990-1000 ℃ through water; rolling the blank;
and (3) a second rolling process: heating the blank to 1015-1025 ℃; rolling the blank; cooling the blank to 930-960 ℃ through water; rolling the blank;
and (3) a third rolling process: heating the blank to 995-1005 ℃; rolling the blank; cooling the blank to 870-890 ℃ through water; rolling the blank;
the spinning process comprises the following steps: cooling the blank to 810-820 ℃ through water; the billet is spun to form a wire.
The further technical scheme is as follows: the laying process is followed by a cooling process:
cooling the wire for the first time; adding water mist into the wire rod during air cooling; the cooling speed is controlled to be 20-21 ℃/S;
cooling the wire for the second time; air cooling the wire; the cooling speed is controlled to be 10-11 ℃/S.
The further technical scheme is as follows: the water-through cooling medium in the first rolling process is hot water; the temperature of the hot water is 95-100 ℃; the cooling medium for water passing in the second rolling process is cold water; the temperature of cold water is 5-10 ℃; the water cooling medium is the coolant in the third rolling process; the water cooling medium is cold water in the spinning process.
The further technical scheme is as follows: the wire comprises the following elements in percentage by mass: carbon: less than or equal to 0.08 percent; silicon: less than or equal to 0.08 percent; manganese: 0.25 to 0.5 percent; phosphorus: less than or equal to 0.027 percent; sulfur: less than or equal to 0.031%; the balance being impurities and iron.
Compared with the prior art, the invention has the following beneficial technical effects: (1) The desiliconization, dephosphorization and desulfurization treatment of the raw material are completed through the molten iron pretreatment step, the content of elements in the raw material is strictly controlled, and the comprehensive performance of the spring steel wire and the finished product quality of the spring steel wire are ensured; (2) The desiliconization agent and the raw material are stirred and mixed for the first time in the process that the raw material flows into the pretreatment station, the raw material and the desiliconization agent are stirred and mixed for the second time after the raw material flows into the pretreatment station, and the raw material and the desiliconization agent are stirred for two times, so that the diffusion speed of silicon elements is improved, the interfacial area of reaction is increased, and the utilization efficiency of the desiliconization agent is improved; (3) The desiliconization treatment process adopts two heating processes, the first heating process is firstly carried out to 1320-1350 ℃ and then oxygen blowing heating is carried out, so that the raw material is fully heated and is heated to 1490-1510 ℃, and the influence of the temperature reduction of the raw material on the subsequent dephosphorization treatment and desulfurization treatment temperature in the desiliconization process is small; (4) The soda ash and the sintering ore are blown into the pretreatment station, so that the raw material, the soda ash and the sintering ore are mixed for the first time, and then the raw material, the soda ash and the sintering ore are mixed for the second time in a stirring manner, so that the raw material, the soda ash and the sintering ore can be fully mixed, and the dephosphorization efficiency is improved; (5) The passivating particle magnesium finishes two actions of sinking and floating in the raw material, the contact time of the passivating particle magnesium and the raw material is prolonged, the passivating particle magnesium is fully contacted and fully reacted with the raw material, the desulfurization treatment of the raw material is finished, and simultaneously, carbon dioxide generated by a desulfurizer in the desulfurization treatment process fully stirs the passivating particle magnesium and the raw material in the process of sinking and floating of the passivating particle magnesium, so that the desulfurization treatment of the raw material is finished; (6) After the aluminum-calcium wire is added into the raw materials, the deoxidation capability is improved due to the interaction of aluminum and calcium, the deoxidation effect of the aluminum is greatly improved due to the existence of the calcium, the loss of the aluminum is reduced, and the volatilization loss of the calcium is reduced due to the aluminum; (7) The oxygen-sulfur mass fraction in the raw material and the composition of oxide sulfide can be effectively controlled through the existence of calcium, so that the content of non-metallic inclusions can be reduced, and the properties and the shapes of the non-metallic inclusions can be changed, thereby improving the quality of the raw material and ensuring the normal operation of production; (8) The reduction of oxides in the raw materials can be accelerated by argon blowing and stirring, in addition, the material transfer among the steel slag can be accelerated by argon blowing and stirring, good dynamic conditions are provided for the chemical reaction among the steel slag, the raw materials form a good circulating state by blowing argon into the bottom of the raw materials, and the argon can promote the upward floating of alumina; (9) The blank structure is refined by two times of rough rolling in the first rolling process, the hardness of the blank is improved by suddenly reducing the temperature of the blank in the first rolling process, and the blank is rolled to improve the structure and the performance of the blank; in the second rolling process, the hardness of the blank is improved by suddenly reducing the temperature of the blank, and then the blank is rolled to improve the structure and the performance of the blank; in the third rolling process, the hardness of the blank is improved by suddenly reducing the temperature of the blank, and then the blank is rolled to improve the structure and the performance of the blank.
Drawings
Fig. 1 shows a process flow chart of a continuous casting and rolling production process of the spring steel wire of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention more comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
Fig. 1 shows a process flow chart of a continuous casting and rolling production process of the spring steel wire of the invention. The invention discloses a continuous casting and rolling production process of a spring steel wire, which is shown by combining with a figure 1.
The continuous casting and rolling production process of the spring steel wire comprises the following steps:
and (4) pretreating molten iron. The raw materials are sequentially subjected to desiliconization, dephosphorization and desulfurization treatment.
The iron liquid pretreatment comprises the following steps:
desiliconizing treatment: the raw materials are heated for the first time. Temperature rise: 1320 to 1350 ℃. Blowing oxygen to the raw material for the second heating. Temperature rise: 1490-1510 deg.C. The feedstock flows into a pre-treatment station. The desiliconization agent is added into the raw materials in the flowing process. After the raw material flows into the pretreatment station, the raw material is stirred.
Dephosphorization treatment: the raw material in the pretreatment station is sprayed with soda ash and sinter. The raw materials are stirred.
And (3) desulfurization treatment: the raw material is sprayed with passivated granular magnesium and desulfurizer.
Silicon in the raw materials is an important heating element in steel making, and is also an indispensable slagging element of the raw materials. However, when the content of silicon element in the raw material is too high, a large amount of silica is generated in the raw material during steel making. Silicon in the raw materials can be removed by the iron oxide slag, but the diffusion of the silicon in the boundary layer of the raw materials in the desiliconization treatment process is a limiting link of the desiliconization reaction. The desiliconization agent and the raw material are stirred and mixed for the first time in the process that the raw material flows into the pretreatment station, and the raw material and the desiliconization agent are stirred and mixed for the second time after the raw material flows into the pretreatment station. The raw materials and the desiliconization agent are stirred twice, so that the diffusion speed of the silicon element is improved, the interfacial area of the reaction is increased, and the utilization efficiency of the desiliconization agent is improved.
Since the desiliconization of the raw material is an exothermic process, but the desiliconization agent needs to be heated to melt and absorb heat, the desiliconization using the desiliconization agent causes the temperature of the raw material to be lowered. The desiliconization treatment process adopts two temperature raising processes, wherein in the first temperature raising process, the temperature is raised to 1320-1350 ℃ first, then oxygen blowing is carried out for raising the temperature, so that the raw material is fully heated, and the temperature is raised to 1490-1510 ℃ which is a higher temperature. So that the temperature of the raw material is reduced in the desiliconization process, and the influence on the temperature of the subsequent dephosphorization treatment and desulfurization treatment is small.
Phosphorus in the raw material is a harmful element, and the phosphorus is easy to segregate in grain boundaries, so that the low-temperature brittleness and temper brittleness of the raw material are caused. After the soda ash and the sintered ore are blown into the raw materials, the soda ash and the sintered ore quickly contact the raw materials to decompose and melt.
The raw material is required to be subjected to desiliconization before dephosphorization treatment, and the mass ratio of the silicon content in the raw material after desiliconization is less than 0.1%.
The soda ash and the sintering ore have high alkalinity and high oxidability, and the phenomena of less slag and no slag in the pretreatment process of the raw materials are realized. The soda ash and the sintering ore are blown into the pretreatment station, so that the first mixing of the raw material, the soda ash and the sintering ore is completed, and the second mixing of the raw material, the soda ash and the sintering ore is completed in a stirring manner, so that the raw material, the soda ash and the sintering ore can be fully mixed, and the dephosphorization efficiency is improved.
Sulfur is also a harmful element for the raw material, and increases the hot shortness of the raw material. When the raw material is in the temperature range of 1150-1220 ℃, eutectic with low melting point distributed in the grain boundary is melted to cause cracking, which is the cracking phenomenon.
Preferably, the desulfurizing agent is calcite. The main component of calcite is calcium carbonate. The calcite is easy to break at high temperature, and the calcite is free from deliquescence and deterioration, high in strength and high in density. The temperature of the raw material is lowered after the desiliconization and dephosphorization, but the temperature of the raw material is more than 1250 ℃ when the desulfurization is performed. Calcite is rapidly crushed upon contact with the feedstock, and as a result of the calcite crushing, more particulate matter of smaller diameter is formed. The higher temperature of the raw materials accelerates the dissolution and decomposition of calcite. A large amount of carbon dioxide is generated in the decomposition process of the calcite, the carbon dioxide plays a role in stirring the raw materials in the floating process, and the utilization efficiency of the passivated granular magnesium is improved.
The passivated granular magnesium, the desulfurizer and the thickening agent are sprayed into the raw materials from the upper part of the raw materials, the passivated granular magnesium has light weight, and floating force can be generated in the raw materials. When the passivated magnesium particles are just sprayed into the raw materials, the passivated magnesium particles sink in the raw materials, and when the passivated magnesium particles sink to a certain depth, the passivated magnesium particles begin to float upwards. The passivated granular magnesium finishes two actions of sinking and floating in the raw material, so that the contact time of the passivated granular magnesium and the raw material is prolonged, the passivated granular magnesium is in full contact and full reaction with the raw material, and the desulfurization treatment of the raw material is finished. Meanwhile, carbon dioxide generated by the desulfurizer in the desulfurization treatment process fully stirs the passivated magnesium particles and the raw material in the process of sinking and floating of the passivated magnesium particles to finish the desulfurization treatment of the raw material.
The desiliconization, dephosphorization and desulfurization treatment of the raw materials are completed through the molten iron pretreatment step, the content of elements in the raw materials is strictly controlled, and the comprehensive performance of the spring steel wire and the finished product quality of the spring steel wire are ensured.
And (4) a combined blown converter step. The raw materials are put into a furnace for heating, and aluminum, alloy and carburant are added into the raw materials.
The combined blown converter comprises:
heating for the first time: heating the raw materials to 1490-1510 ℃. Adding aluminum blocks and alloys into the raw materials.
And (4) heating for the second time. Heating the raw materials to 1605-1615 ℃. Adding aluminum particles and a carburant into the raw materials. Raw material tapping temperature: 1650 to 1670 ℃.
The combined blowing converter comprises two heating processes, wherein an aluminum block and an alloy are added in the first heating process, and the preferred alloy is a titanium-boron alloy. In the second heating process, the aluminum block and the alloy are heated together with the raw materials, so that the aluminum block and the alloy are completely melted into the raw materials after being melted. In the second heating process, after adding aluminum particles and carburant, heating is continued to be carried out at the temperature of 1650-1670 ℃, and tapping is finished.
A first refining step. The raw materials are heated to 1645-1655 ℃. Adding aluminum-calcium wires into the raw materials. Argon gas was blown into the bottom of the raw material. Argon flow: 75-150L/min.
The first refining step is followed by a second refining step:
the raw materials are heated to 1610 to 1630 ℃. And (4) vacuumizing in the furnace. Vacuum degree: 8 to 10Pa. Vacuum time: 4-6 min. The hydrogen content is less than 8.3ppm. The nitrogen content was 35. + -.5 ppm.
Before the second refining step, the refining preparation step is also included: controlling the temperature in the furnace: 1500 to 1510 ℃. And (5) vacuumizing the furnace. Vacuum degree: 90 to 100Pa. The time for finishing the vacuum pumping is controlled to be 6-8 min.
The deoxidation capability of the aluminum is strong, and the deoxidation speed of the aluminum is high. The aluminum and calcium are added into the raw materials for deoxidation, so that the using amount of aluminum is reduced. The deoxygenated product of the aluminum is alumina, which appears as a solid in the feedstock. By reducing the amount of aluminum, the raw material is prevented from adhering to the position of a water gap during casting.
The deoxidizing capacity of calcium will be stronger than that of aluminum. Since calcium has a low boiling point, it is difficult to dissolve in the raw material at the refining heating temperature, but since aluminum calcium wires are added to the raw material, the solubility of calcium in the raw material can be improved in the case where aluminum is present in the raw material.
After the aluminum-calcium wire is added into the raw materials, the deoxidation capability is improved due to the interaction of the aluminum and the calcium, the deoxidation effect of the aluminum is greatly improved due to the existence of the calcium, the loss of the aluminum is also reduced, and meanwhile, the volatilization loss of the calcium is also reduced due to the aluminum.
A small amount of alumina can still be generated after the raw materials are added into the aluminum-calcium wire, and hidden troubles can still exist in the blockage of a water gap. The oxygen-sulfur mass fraction in the raw material and the composition of oxide sulfide can be effectively controlled through the existence of calcium, so that the content of non-metallic inclusions can be reduced, and the properties and the shapes of the non-metallic inclusions can be changed, thereby improving the quality of the raw material and ensuring the normal operation of production.
In the process of blowing argon into the bottom of the raw material, nitrogen and hydrogen in the raw material diffuse to argon bubbles, the air pressure in the argon bubbles is increased, the argon bubbles float upwards and expand to a steel slag interface, and the nitrogen and hydrogen in the raw material are discharged along with the escape of the argon bubbles. The interfacial tension between the argon surface and the nonmetallic inclusion is small, and the inclusion is easily adsorbed by argon and carried out of the raw material. The temperature and the components of the raw materials can be uniformly stirred by bottom-blowing argon gas for stirring. The reduction of oxides in the raw materials can be accelerated by argon blowing stirring, and in addition, the mass transfer between the steel slags can be accelerated by argon blowing stirring, so that good dynamic conditions are provided for the chemical reaction between the steel slags. Argon is blown into the bottom of the raw material, so that the raw material forms a good circulating state, and the argon can promote the alumina to float upwards.
The degree of vacuum in the furnace is rapidly increased by a refining preparation step before the second refining step. The furnace is vacuumized within 6-8 min, and the vacuum degree is controlled at 90-100 Pa. Quickens the speed of the raw material decarburization reaction and strengthens the decarburization effect of the raw material.
The vacuum degree is controlled to be 8-10 Pa by vacuumizing in the furnace, so that the deep vacuum in the furnace is quickly achieved, the large interface area of the circulation of the raw materials is ensured, and the hydrogen content in the raw materials is low. Nitrogen is formed with other elements in the feedstock 10 A stable compound, in which the solubility of nitrogen in the raw material is relatively high and the nitrogen ion radius is 1.1 × 10cm, the diffusion speed of nitrogen in the raw material is slow. The dehydrogenation rate and the denitrification rate in the raw material are improved by controlling the concentration of the hydrogen content and the concentration of the nitrogen content.
And (5) casting. The raw material is cast to form a billet. The discharging temperature of the blank is 1000-1050 ℃.
The raw materials are cast into blanks by casting the raw materials, and the blanks are cooled after being cast, so that the discharging temperature of the blanks is controlled to be 1000-1050 ℃. The blank can generate heat loss after being discharged, and the blank needs to be heated when being rolled.
And (4) rolling. The billet is heated. The blank is sequentially cooled and rolled to form a wire rod.
The rolling step comprises the following processes:
the first rolling process: the blank is heated to 1035-1045 ℃. And rolling the blank. Cooling the blank to 990-1000 ℃ through water. And rolling the blank.
And (3) a second rolling process: heating the blank to 1015-1025 ℃. And rolling the blank. Cooling the blank to 930-960 deg.c through water. And rolling the blank.
And (3) a third rolling process: the blank was heated to 995-1005 ℃. And rolling the blank. Cooling the blank to 870-890 ℃ through water. And rolling the blank.
The spinning process comprises the following steps: cooling the blank to 810-820 deg.c with water. The billet is spun to form a wire.
The laying process is followed by a cooling process:
the wire is cooled for the first time. And adding water mist into the wire rod during air cooling. The cooling speed is controlled to be 20-21 ℃/S.
The wire is cooled a second time. And air cooling the wire. The cooling speed is controlled at 10-11 ℃/S.
The water cooling medium in the first rolling process is hot water. The temperature of the hot water is 95-100 ℃. And the cooling medium of the water passing through in the second rolling process is cold water. The temperature of the cold water is 5-10 ℃. And the water cooling medium is a coolant in the third rolling process. The water-passing cooling medium is cold water in the spinning process.
The wire comprises the following elements in percentage by mass: carbon: less than or equal to 0.08 percent; silicon: less than or equal to 0.08 percent; manganese: 0.25 to 0.5 percent; phosphorus: less than or equal to 0.027 percent; sulfur: less than or equal to 0.031 percent.
In the first rolling process, the blank is heated to 1035-1045 ℃ and then subjected to first rough rolling, and after the first rough rolling is finished, the blank passes through hot water to finish the cooling of the blank, so that the blank is cooled to 990-1000 ℃, and the cooling amplitude is smaller. And the blank structure is thinned by two times of rough rolling in the first rolling process. In the first rolling process, the hardness of the blank is improved by suddenly reducing the temperature of the blank, and then the blank is rolled to improve the structure and the performance of the blank.
In the second rolling process, the blank is heated to 1015-1025 ℃ and then is subjected to first intermediate rolling, and the blank passes through cold water after the first intermediate rolling to complete the cooling of the blank, so that the blank is cooled to 930-960 ℃, and the cooling amplitude is large. And rolling twice in the second rolling process to refine the blank structure and uniformly distribute blank structure particles. In the second rolling process, the hardness of the blank is improved by suddenly reducing the temperature of the blank, and then the blank is rolled to improve the structure and the performance of the blank.
In the third rolling process, the blank is heated to 995-1005 ℃ and then is subjected to first fine rolling, and after the first fine rolling is finished, the blank passes through a coolant to finish the cooling of the blank, so that the blank is cooled to 870-890 ℃, and the cooling amplitude is large. And two times of fine rolling in the third rolling process enable the blank structure to refine grains and reduce burning loss. In the third rolling process, the hardness of the blank is improved by suddenly reducing the temperature of the blank, and then the blank is rolled to improve the structure and the performance of the blank.
The spinning process comprises the following steps: cooling the blank to 810-820 ℃ through water; the billet is spun to form a wire.
And in the spinning process, the blank is spun and formed by cold water.
The wire needs to be cooled at a certain cooling speed after the spinning process, and when the wire is cooled for the first time, water mist is added in the air cooling process, so that the cooling capacity of the first cooling is improved, the cooling speed can be controlled at 20-21 ℃/S, and the cooling speed at a higher speed is completed.
When the wire is cooled for the second time, the wire is cooled in an air cooling mode, the cooling speed is controlled to be 10-11 ℃/S, and the problem that the wire is cooled too fast to influence the stability of the wire structure is avoided.
The process flow of the invention is illustrated below with two examples:
the first embodiment:
the continuous casting and rolling production process of the spring steel wire comprises the following steps:
and (4) pretreating molten iron. The raw materials are sequentially subjected to desiliconization, dephosphorization and desulfurization treatment.
The iron liquid pretreatment comprises the following steps:
desiliconization treatment: the raw materials are heated for the first time. Temperature rise: 1320 deg.C. Blowing oxygen to the raw material for the second heating. Temperature rise: 1490 ℃. The feedstock flows into a pre-treatment station. The desiliconization agent is added into the raw materials in the flowing process. After the feedstock flows into the pretreatment station, the feedstock is agitated.
Dephosphorization treatment: the raw material in the pretreatment station is sprayed with soda ash and sinter. The raw materials are stirred.
And (3) desulfurization treatment: the raw materials are sprayed with passivated granular magnesium and a desulfurizer.
And (4) a combined blown converter step. The raw materials are put into a furnace and heated, and aluminum, alloy and carburant are added into the raw materials.
The combined blown converter comprises:
heating for the first time: the starting material was heated to 1490 ℃. Adding aluminum blocks and alloys into the raw materials.
And (5) heating for the second time. The material was heated to 1640 ℃. Adding aluminum particles and a carburant into the raw materials.
The refining preparation step is also included before the second refining step: controlling the temperature in the furnace: 1500 ℃ in the presence of a catalyst. And (5) vacuumizing the furnace. Vacuum degree: 90Pa. The vacuumizing completion time is controlled to be 6min.
A first refining step. The feed was heated to 1645 ℃. Adding aluminum-calcium wires into the raw materials. Argon gas was blown into the bottom of the raw material. Argon flow: 75L/min.
The first refining step is followed by a second refining step:
the feedstock was heated to 1610 ℃. And (5) vacuumizing the furnace. Vacuum degree: 8Pa. Vacuum time: and 4min. The hydrogen content was 7.0ppm. The nitrogen content was 30ppm.
And casting. The raw material is cast to form a billet. The discharge temperature of the blank is 1200 ℃.
And (5) rolling. The billet is heated. And sequentially cooling the blank, and rolling to form the wire rod.
The rolling step comprises the following processes:
the first rolling process: the billet was heated to 1035 ℃. And rolling the blank. The billet was water cooled to 990 ℃. And rolling the blank.
And (3) a second rolling process: the billet was heated to 1015 ℃. And rolling the blank. The billet was cooled to 930 ℃ through water. And rolling the blank.
And (3) a third rolling process: the ingot was heated to 995 c. And rolling the blank. The billet was cooled through water to 870 ℃. And rolling the blank.
The spinning process comprises the following steps: the billet was cooled through water to 810 ℃. The billet is spun to form a wire.
The laying process is followed by a cooling process:
the wire is cooled for the first time. And adding water mist into the wire rod during air cooling. The cooling rate was controlled at 20 deg.C/S.
And cooling the wire for the second time. And air cooling the wire. The cooling rate was controlled at 10 ℃/S.
The water-through cooling medium in the first rolling process is hot water. The hot water temperature was 95 ℃. And the cooling medium of the water passing through in the second rolling process is cold water. The cold water temperature was 5 ℃. And the water cooling medium is a coolant in the third rolling process. The water-passing cooling medium is cold water in the spinning process.
The wire comprises the following elements in percentage by mass: carbon: 0.06 percent; silicon: 0.02 percent; manganese: 0.25 percent; phosphorus: 0.022%; sulfur: 0.026%; the balance being impurities and iron.
The first embodiment:
the continuous casting and rolling production process of the spring steel wire comprises the following steps of:
and (4) pretreating molten iron. The raw materials are sequentially subjected to desiliconization, dephosphorization and desulfurization treatment.
The iron liquid pretreatment comprises the following steps:
desiliconization treatment: the raw materials are heated for the first time. Temperature rise: 1350 ℃. Blowing oxygen to the raw material for the second heating. Temperature rise: 1510 ℃ was used. The feedstock flows into a pre-treatment station. The desiliconization agent is added into the raw materials in the flowing process. After the feedstock flows into the pretreatment station, the feedstock is agitated.
Dephosphorization treatment: the raw material in the pretreatment station is sprayed with soda ash and sinter. The raw materials are stirred.
And (3) desulfurization treatment: the raw materials are sprayed with passivated granular magnesium and a desulfurizer.
And (4) a combined blown converter step. The raw materials are put into a furnace for heating, and aluminum, alloy and carburant are added into the raw materials.
The combined blown converter comprises:
heating for the first time: the feed was heated to 1510 ℃. Adding aluminum blocks and alloys into the raw materials.
And (4) heating for the second time. The starting material was heated to 1660 ℃. Adding aluminum particles and a carburant into the raw materials.
The refining preparation step is also included before the second refining step: controlling the temperature in the furnace: 1510 ℃ was used. And (4) vacuumizing in the furnace. Vacuum degree: 100Pa. The vacuumizing completion time is controlled at 8min.
A first refining step. The batch was heated to 1655 ℃. Adding aluminum-calcium wires into the raw materials. Argon gas was blown into the bottom of the raw material. Argon flow: 150L/min.
The first refining step is followed by a second refining step:
the feedstock was heated to 1630 ℃. And (5) vacuumizing the furnace. Vacuum degree: 10Pa. Vacuum time: and 6min. The hydrogen content is less than 8.2ppm. The nitrogen content was 40ppm.
And (5) casting. The raw material is cast to form a billet. The blank discharge temperature was 1210 ℃.
And (4) rolling. The billet is heated. And sequentially cooling the blank, and rolling to form the wire rod.
The rolling step comprises the following processes:
a first rolling process: the billet was heated to 1045 ℃. And rolling the blank. The billet was cooled to 1000 ℃ with water. And rolling the blank.
And (3) a second rolling process: the billet was heated to 1025 ℃. And rolling the blank. The billet was water cooled to 960 ℃. And rolling the blank.
And (3) a third rolling process: the billet was heated to 1005 ℃. And rolling the blank. The billet was cooled through water to 890 ℃. And rolling the blank.
A spinning process: the billet was cooled through water to 820 ℃. The billet is spun to form a wire.
The laying process also comprises a cooling process:
the wire is cooled for the first time. And adding water mist during air cooling of the wire. The cooling rate was controlled at 21 ℃ C/S.
The wire is cooled a second time. And air cooling the wire. The cooling rate was controlled at 11 ℃/S.
The water-through cooling medium in the first rolling process is hot water. The hot water temperature was 100 ℃. And in the second rolling process, the cooling medium of the water is cold water. The cold water temperature was 10 ℃. And in the third rolling process, a water-through cooling medium is used as a coolant. The water-passing cooling medium is cold water in the spinning process.
The wire comprises the following elements in percentage by mass: carbon: 0.08%; silicon: 0.08%; manganese: 0.5 percent; phosphorus: 0.027%; sulfur: 0.031%; the balance being impurities and iron.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (9)
1. A continuous casting and rolling production process of a spring steel wire is characterized by comprising the following steps: the method comprises the following steps:
pretreating molten iron; sequentially carrying out desiliconization, dephosphorization and desulfurization treatment on the raw materials;
a converter combined blowing step; heating raw materials in a furnace, and adding aluminum, alloy and a carburant into the raw materials;
a first refining step; heating the raw materials to 1645-1655 ℃; adding aluminum-calcium wires into the raw materials; argon is blown into the bottom of the raw material; argon flow: 75-150L/min;
casting; casting raw materials to form a blank; the discharging temperature of the blank is 1000-1050 ℃;
rolling; heating the blank; and sequentially cooling the blank, and rolling to form the wire rod.
2. The continuous casting and rolling production process of a spring steel wire according to claim 1, characterized in that: the iron liquid pretreatment comprises the following steps:
desiliconizing treatment: heating the raw materials for the first time; temperature rise: 1320 to 1350 ℃; blowing oxygen to the raw material for second heating; temperature rise: 1490 to 1510 ℃; the raw material flows into a pretreatment station; adding desiliconization agent into the raw material in the flowing process; after the raw materials flow into the pretreatment station, stirring the raw materials;
dephosphorization treatment: blowing soda ash and sinter into raw materials in a pretreatment station; stirring the raw materials;
and (3) desulfurization treatment: the raw material is sprayed with passivated granular magnesium and desulfurizer.
3. The continuous casting-rolling production process for spring steel wire according to claim 2, characterized in that: the combined blown converter comprises:
heating for the first time: heating the raw materials to 1490-1510 ℃; adding aluminum blocks and alloys into the raw materials;
heating for the second time; heating the raw materials to 1605-1615 ℃; adding aluminum particles and a carburant into the raw materials; raw material tapping temperature: 1650 to 1670 ℃.
4. The continuous casting-rolling production process for spring steel wire according to claim 1, characterized in that: the first refining step is followed by a second refining step:
heating the raw materials to 1610 to 1630 ℃; vacuumizing in the furnace; vacuum degree: 8-10 Pa; vacuum time: 4-6 min; hydrogen content less than 8.3ppm; the nitrogen content was 35. + -.5 ppm.
5. The continuous casting and rolling production process of a spring steel wire according to claim 4, characterized in that: the refining preparation step is also included before the second refining step: controlling the temperature in the furnace: 1500 to 1510 ℃; vacuumizing in the furnace; vacuum degree: 90-100 Pa; the vacuumizing completion time is controlled to be 6-8 min.
6. The continuous casting-rolling production process for spring steel wire according to claim 1, characterized in that: the rolling step comprises the following processes:
the first rolling process: heating the blank to 1035-1045 ℃; rolling the blank; cooling the blank to 990-1000 ℃ through water; rolling the blank;
and (3) a second rolling process: heating the blank to 1015-1025 ℃; rolling the blank; cooling the blank to 930-960 ℃ through water; rolling the blank;
and (3) a third rolling process: heating the blank to 995-1005 ℃; rolling the blank; cooling the blank to 870-890 ℃ through water; rolling the blank;
the spinning process comprises the following steps: cooling the blank to 810-820 ℃ through water; the billet is spun to form a wire.
7. The continuous casting and rolling production process of a spring steel wire as claimed in claim 6, characterized in that: the laying process also comprises a cooling process:
cooling the wire for the first time; adding water mist into the wire rod during air cooling; the cooling speed is controlled to be 20-21 ℃/S;
cooling the wire for the second time; air cooling the wire; the cooling speed is controlled at 10-11 ℃/S.
8. The continuous casting-rolling production process for spring steel wire according to claim 6, characterized in that: the water-passing cooling medium in the first rolling process is hot water; the temperature of the hot water is 95-100 ℃; the cooling medium for water passing in the second rolling process is cold water; the temperature of the cold water is 5-10 ℃; the water cooling medium is the coolant in the third rolling process; the water cooling medium is cold water in the spinning process.
9. The continuous casting and rolling production process of a spring steel wire according to claim 1, characterized in that: the wire comprises the following elements in percentage by mass: carbon: less than or equal to 0.08 percent; silicon: less than or equal to 0.08 percent; manganese: 0.25 to 0.5 percent; phosphorus: less than or equal to 0.027 percent; sulfur: less than or equal to 0.031%; the balance being impurities and iron.
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| CN114574770A (en) * | 2022-03-05 | 2022-06-03 | 新疆八一钢铁股份有限公司 | Preparation method of high-strength fatigue-resistant 60Si2MnA spring steel |
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- 2022-07-22 CN CN202210871507.9A patent/CN115216584A/en active Pending
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| CN107299291A (en) * | 2017-06-30 | 2017-10-27 | 武汉钢铁有限公司 | A kind of spring steel and its skin decarburization control technique |
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| CN113061799A (en) * | 2021-03-30 | 2021-07-02 | 张家港荣盛特钢有限公司 | High-cleanliness spring steel and production method thereof |
| CN113981193A (en) * | 2021-10-15 | 2022-01-28 | 邯郸钢铁集团有限责任公司 | Method for controlling net carbide of GCr15 bearing steel wire rod |
| CN114574770A (en) * | 2022-03-05 | 2022-06-03 | 新疆八一钢铁股份有限公司 | Preparation method of high-strength fatigue-resistant 60Si2MnA spring steel |
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