CN114752743B - Preparation method of 55SiCrA wire rod for automobile suspension spring - Google Patents
Preparation method of 55SiCrA wire rod for automobile suspension spring Download PDFInfo
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- CN114752743B CN114752743B CN202210254054.5A CN202210254054A CN114752743B CN 114752743 B CN114752743 B CN 114752743B CN 202210254054 A CN202210254054 A CN 202210254054A CN 114752743 B CN114752743 B CN 114752743B
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- 239000000725 suspension Substances 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 65
- 238000001816 cooling Methods 0.000 claims abstract description 64
- 238000007670 refining Methods 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000009749 continuous casting Methods 0.000 claims abstract description 27
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 11
- 238000000227 grinding Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000005303 weighing Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 24
- 238000004321 preservation Methods 0.000 claims description 17
- 239000002893 slag Substances 0.000 claims description 16
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 14
- 239000010936 titanium Substances 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 12
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 12
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 12
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 239000011651 chromium Substances 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 8
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 8
- 239000010436 fluorite Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- 238000009987 spinning Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 4
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000000788 chromium alloy Substances 0.000 claims description 4
- 239000010903 husk Substances 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 238000010926 purge Methods 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 abstract description 16
- 229910000639 Spring steel Inorganic materials 0.000 abstract description 16
- 238000005261 decarburization Methods 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000011572 manganese Substances 0.000 description 8
- 235000013339 cereals Nutrition 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 238000013016 damping Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 230000001172 regenerating effect Effects 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000914 Mn alloy Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910000720 Silicomanganese Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 2
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- 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
- 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
-
- 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
-
- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- 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
- C22C38/28—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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
Abstract
A preparation method of a 55SiCrA wire rod for an automobile suspension spring belongs to the field of automobile suspension spring steel materials. The invention aims to solve the technical problems of reducing wire rod decarburization and solving the problem of extremely poor tissue performance. The process route of the invention is as follows: converter smelting, LF refining, RH vacuum degassing, continuous casting of a six-machine six-flow arc billet continuous casting machine, billet grinding, heating by a heat accumulating type heating furnace, high-pressure water dephosphorization, wire rod rolling and coil cooling control, bundling, weighing, listing and warehousing. The tensile strength of the spring steel wire rod produced by the invention is 1005-1045MPa, the shrinkage rate is 51.0-54.7%, the depth of a decarburized layer is reduced to below 0.6% D, the same-circle performance is extremely poor and controlled within 40MPa, the sorbite proportion is more than 95%, the uniformity is better, the decarburization of the wire rod is reduced, the problem of extremely poor tissue performance is solved, and the fatigue life of the wire rod is prolonged.
Description
Technical Field
The invention belongs to the field of spring steel materials of automotive suspension; in particular to a preparation method of 55SiCrA wire rods for automobile suspension springs.
Background
The spring steel 55SiCrA is the most commonly used alloy spring steel at present, is mainly used for manufacturing a vehicle suspension spring, and is an important part for buffering and damping in an automobile chassis damping system. Because of long-term high-frequency reciprocating compression, the material is required to have higher strength, better fatigue life, better damping performance and enough plasticity and toughness. In order to ensure that 100 ten thousand fatigue life tests are qualified and the wire rod has good processing performance, besides ensuring the surface quality, the component segregation and the internal material purity of the wire rod, a proper cooling control process is required to be selected to ensure the tissue shape and the performance of the wire rod.
The Si content in the spring steel 55SiCrA component is higher, and reasonable heating, rolling and cooling control processes are adopted to reduce wire rod decarburization during production; the production characteristics of the wire rod coil lead to inconsistent stacking thickness of the coil in the transverse direction of the air cooling roller way, and lead to metallographic structure difference of different positions of the coil due to inconsistent stacking thickness under the condition of the same air volume of the fan, thereby affecting the uniformity of the whole structure and performance of the coil, wherein the coil is easy to have a martensitic structure in part when the cooling speed is too high, and the coil is insufficient in partial sorbite quantity when the cooling speed is too low.
The invention patent CN102747210A, a Steyr controlled cooling method of 55SiCrA spring steel wire rod, refers to controlling the spinning temperature to 850+/-10 ℃; the air quantity of the first fan is set to be 10-100%, and the rest is closed; the first-stage roller speed is 0.3-0.5m/s; meanwhile, the opening of the heat preservation cover is controlled, so that the front 25 meters of the wire rod is rapidly cooled to 630-710 ℃, the cooling speed is kept at 0-2K/s within the range of 26-100 meters, and the coil collecting temperature is 550-630 ℃. The wire rod with high sorbite rate, stable strength and good plasticity can be obtained.
The invention patent CN106734261A, which is mentioned in the Steyr air-cooled wire-controlled cooling process for improving the structure and performance of spring steel wire rods, the spinning temperature is 805+/-15 ℃, the cooling speed of the first two fans is controlled to be 5-13 ℃/s, the temperature of the 4 th-5 th fans is returned to be 10-50 ℃, the cooling speed of the 6 th fan and the later positions is below 3 ℃/s, the heat-preserving cover is closed after the wire rods are in the air range of 670-700 ℃, the cooling speed in the heat-preserving cover is controlled to be 0.8-2 ℃/s, the temperature of the outlet cover is 580-630 ℃, the obtained structure is pearlite and a small amount of ferrite, the shrinkage rate can reach more than 60%, and the strength, the hardness and the like can meet the performance requirements.
In the prior art, the cooling speed of each section of wire rod is changed through the adjustment of the air quantity of a stelmor air cooling line fan, so that the generating temperature range of the wire rod sorbite tissue is controlled, most positions of the wire rod can obtain ideal tissue, but the above technology can not solve the uniformity problem of the wire rod tissue and performance.
Disclosure of Invention
The invention aims to provide a preparation method of a 55SiCrA wire rod for an automobile suspension spring, which reduces wire rod decarburization and solves the problem of extremely poor tissue performance.
The invention is realized by the following technical scheme:
the preparation method of the 55SiCrA wire rod for the automobile suspension spring comprises the following steps of: converter smelting, LF refining, RH vacuum degassing, continuous casting of a six-machine six-flow arc billet continuous casting machine, billet grinding, heating by a heat accumulating type heating furnace, high-pressure water dephosphorization, wire rod rolling and coil cooling control, bundling, weighing, listing and warehousing.
The invention relates to a preparation method of a 55SiCrA wire rod for an automobile suspension spring, which comprises the steps of tapping temperature 1650-1700 ℃ in the converter smelting process, steel ladle argon bottom blowing strong stirring in the tapping process, and adding deoxidizing agent and alloy slag in sequence: after 40 tons of steel are tapped, 800-810kg of lime, 10-10.5kg of low-aluminum ferrosilicon, 9.4-9.6kg of ferrosilicon, 8-8.5kg of high-purity ferrosilicon, 7.5-8kg of low-titanium high-chromium alloy are added, and after 50 tons of steel are tapped, 150-155kg of fluorite is added.
According to the preparation method of the 55SiCrA wire rod for the automobile suspension spring, in the LF refining process, carbon powder, ferrosilicon powder or silicon carbide is used as a deoxidizer, the white slag refining time is more than 15 minutes, and the deoxidizer is added in the LF refining process in sequence: 50-52kg of fluorite particles, 20-21kg of carbon powder and 65-68kg of silicon carbide are added in batches after the first power transmission, 250-255kg of silica, 200-205kg of acid slag, 45-47kg of silicon carbide and 25-26kg of carbon powder are added 10 minutes before the refining is finished.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, disclosed by the invention, the components in the LF refining process are regulated to 0.53-0.57wt% of C, 1.43-1.50wt% of Si, 0.63-0.68wt% of Mn, 0.63-0.68wt% of Cr, less than or equal to 0.015wt% of P, less than or equal to 0.015wt% of S, less than or equal to 0.005wt% of Al, less than or equal to 0.005wt% of Ti and less than or equal to 0.0008wt% of Ca, and the molten steel temperature is shifted to the next working procedure at 1602-1632 ℃.
According to the preparation method of the 55SiCrA wire rod for the automobile suspension spring, the RH vacuum degassing process is that the vacuum maintaining time is 15-20 minutes when the vacuum degree is less than or equal to 67Pa, soft blowing is carried out for more than 20 minutes after the vacuum is finished, 60-80kg of carbonized rice husk is added for heat preservation, and the temperature of molten steel is 1527-1547 ℃ and is transferred to the next working procedure.
The invention relates to a preparation method of a 55SiCrA wire rod for an automobile suspension spring, which comprises the steps of continuously casting a six-machine six-flow arc billet continuous casting machine into a six-machine six-flow arc 200mm by 200mm billet continuous casting machine, and ensuring that the liquid level insertion depth is 100-120mm. 3min before casting, filling argon into the middle ladle for purging, and adopting static light reduction total reduction 15mm,1# tension leveler reduction 0mm,2# tension leveler reduction 3mm,3# tension leveler reduction 4mm,4# tension leveler reduction 5mm and 5-6# tension leveler reduction 0mm for continuous casting blank under the protection of argon.
According to the preparation method of the 55SiCrA wire rod for the automobile suspension spring, provided by the invention, the temperature of a heating preheating section of a regenerative heating furnace is 870-930 ℃, the temperature of a heating section is 980-1020 ℃, the temperature of a soaking section is 1010-1030 ℃, the heating time is 100-130min, and the residual oxygen content in the furnace is controlled below 1.5%.
The preparation method of the 55SiCrA wire rod for the automotive suspension spring comprises the steps of controlling the cogging temperature of a wire rod in the rolling process to 900-980 ℃, controlling the temperature of a finishing mill group to 880-910 ℃ and controlling the coiling and spinning temperature to 890-920 ℃ by adopting a large rolling reduction of not less than 53 mm.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, a Steyr air cooling line is adopted for controlled cooling, an air cooling line roller way is divided into 13 sections, the length of the first section is 3.5 meters, the sections 2-12 are 8.8 meters respectively, the section 13 is 5 meters, the speed of the Steyr air cooling line roller is controlled to be 0.5m/s of the speed of the first section, the advance coefficient of the section 2-12 is 3%, and the advance coefficient of the section 13 is 0.9%.
The invention relates to a preparation method of a 55SiCrA wire rod for an automobile suspension spring, which comprises the following components of 0.53-0.57wt% of C, 1.43-1.50wt% of Si, 0.64-0.70wt% of Mn, 0.64-0.70wt% of Cr, less than or equal to 0.015wt% of P, less than or equal to 0.015wt% of S, less than or equal to 0.10wt% of Ni, less than or equal to 0.08wt% of Cu, less than or equal to 0.010wt% of Mo, less than or equal to 0.005wt% of Al, less than or equal to 0.005wt% of Ti and the balance of Fe.
According to the preparation method of the 55SiCrA wire rod for the automobile suspension spring, si content in the 55SiCrA component of the spring steel is high, and reasonable heating, rolling and cooling control processes are adopted to reduce wire rod decarburization during production; the inherent characteristics of the stelmor air cooling line lead the cooling rate of the wire rod to be inconsistent under the same condition, and finally lead the uniformity of the wire rod structure and performance to be reduced, the wire rod is partially easy to generate a martensitic structure when the cooling rate is too high, and the partial sorbite quantity of the wire rod is insufficient when the cooling rate is too low and the performance is low. Therefore, the cold control process of the spring steel 55SiCrA should be combined with the comprehensive control of wire rod decarburization and property and tissue uniformity to ensure the indexes such as subsequent drawing property, fatigue property and the like.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the depth of the decarburized layer of the produced spring steel wire rod is reduced to below 0.6% D, the same-circle performance is extremely poor and controlled within 40MPa, the sorbite proportion is more than 95%, the uniformity is better, the wire rod decarburization is reduced, the problem of extremely poor tissue performance is solved, and the fatigue life of the wire rod is prolonged.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the tensile strength of the produced spring steel wire rod is 1005-1045MPa, the shrinkage rate is 51.0-54.7%, the sorbite proportion is 95-96%, the grain size is 8.5 level, the decarburization is less than or equal to 0.6% D, and the tissue and performance uniformity are greatly improved.
Drawings
FIG. 1 is a metallographic photograph of a 55SiCrA wire rod for an automotive suspension spring prepared by a method according to one embodiment of the invention with respect to grain size;
FIG. 2 is a metallographic photograph of a 55SiCrA wire rod for an automotive suspension spring prepared according to one method of the present embodiment with respect to the proportion of sorbite;
fig. 3 is a metallographic photograph of a 55SiCrA wire rod for an automotive suspension spring, prepared by a method according to an embodiment.
Detailed Description
The first embodiment is as follows:
the preparation method of the 55SiCrA wire rod for the automobile suspension spring comprises the following steps of: converter smelting, LF refining, RH vacuum degassing, continuous casting of a six-machine six-flow arc billet continuous casting machine, billet grinding, heating by a heat accumulating type heating furnace, high-pressure water dephosphorization, wire rod rolling and coil cooling control, bundling, weighing, listing and warehousing.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, disclosed by the embodiment, the tapping temperature is 1650-1700 ℃ in the converter smelting process, the ladle argon bottom blowing is strongly stirred in the tapping process, and the deoxidizing agent and the alloy slag are added in sequence: after 40 tons of steel are tapped, 800kg of lime, 10kg of low-aluminum ferrosilicon, 9.4kg of silicomanganese, 8kg of high-purity ferrosilicon, 7.5kg of low-titanium high-chromium alloy are added, and after 50 tons of steel are tapped, 150kg of fluorite is added.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, in the LF refining process, carbon powder, ferrosilicon powder or silicon carbide is used as a deoxidizer, the white slag refining time is more than 15 minutes, and the deoxidizer is added in the LF refining process in sequence: 50kg of fluorite particles, 20kg of carbon powder and 65kg of silicon carbide are added in batches of 250kg of silica, 200kg of acid slag, 45kg of silicon carbide and 25kg of carbon powder 10 minutes before the refining is finished.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the components in the LF refining process are adjusted to 0.53-0.57wt% of C, 1.43-1.50wt% of Si, 0.63-0.68wt% of Mn, 0.63-0.68wt% of Cr, less than or equal to 0.015wt% of P, less than or equal to 0.015wt% of S, less than or equal to 0.005wt% of Al, less than or equal to 0.005wt% of Ti and less than or equal to 0.0008wt% of Ca, and the molten steel temperature is transferred to the next working procedure at 1602-1632 ℃.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the RH vacuum degassing process is that the vacuum maintaining time is 15-20 minutes when the vacuum degree is less than or equal to 67Pa, soft blowing is carried out for more than 20 minutes after the vacuum is finished, 60-80kg of carbonized rice husk is added for heat preservation, and the temperature of molten steel is 1527-1547 ℃ and is transferred to the next working procedure.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, a six-machine six-flow arc billet continuous casting machine is used for continuously casting six-machine six-flow arc 200mm square billet continuous casting machines, the liquid level insertion depth is 100-120mm, argon is filled into the continuous casting machines for purging 3min before casting, the whole process is protected by argon, the continuous casting machines adopt static light reduction of 15mm, reduction of 0mm of a 1# tension leveler, reduction of 3mm of a 2# tension leveler, reduction of 4mm of a 3# tension leveler, reduction of 5mm of a 4# tension leveler and reduction of 0mm of a 5-6# tension leveler.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, disclosed by the embodiment, the temperature of a heating preheating section of a regenerative heating furnace is 885 ℃, the temperature of a heating section is 996 ℃, the temperature of a soaking section is 1017 ℃, the heating time is 114min, and the content of residual oxygen in the furnace is controlled below 1.5%.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, which is disclosed by the embodiment, the cogging temperature in the wire rod rolling process is 900-980 ℃, the large reduction is more than or equal to 53mm, the temperature of a finishing mill group is controlled to be 885 ℃, and the coiling and spinning temperature is controlled to be 902 ℃.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, a Steyr air cooling line is adopted for controlled cooling, an air cooling line roller way is divided into 13 sections, the length of the first section is 3.5 meters, the sections 2-12 are 8.8 meters respectively, the section 13 is 5 meters, the speed of the Steyr air cooling line roller is controlled to be 0.5m/s of the speed of the first section, the advance coefficient of the section 2-12 is 3%, and the advance coefficient of the section 13 is 0.9%.
The 55SiCrA wire rod for the automotive suspension spring comprises 0.53-0.57wt% of C, 1.43-1.50wt% of Si, 0.64-0.70wt% of Mn, 0.64-0.70wt% of Cr, less than or equal to 0.015wt% of P, less than or equal to 0.015wt% of S, less than or equal to 0.10wt% of Ni, less than or equal to 0.08wt% of Cu, less than or equal to 0.010wt% of Mo, less than or equal to 0.005wt% of Al, less than or equal to 0.005wt% of Ti, and the balance of Fe.
The preparation method of the 55SiCrA wire rod for the automobile suspension spring comprises the following components in percentage by weight: 0.56wt%, si:1.47wt%, mn:0.66wt%, cr:0.67wt%, P:0.010wt%, S:0.006wt%, ni:0.01wt%, cu:0.02wt%, mo:0.01wt%, al:0.004wt%, ti:0.002wt% and the balance of Fe.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, ti, mo and Ni waste steel is forbidden to be added in the converter smelting process so as to prevent high-temperature oxides from being generated and reduce the service life of the finished spring. The steel tapping component is regulated according to the internal control lower limit to reduce carburetion in the refining process, the stirring is carried out to increase the nitrogen content, the content of C is 0.47-0.50wt%, the content of Si is 1.38-1.43wt%, the content of Mn is 0.60-0.65wt%, the content of Cr is 0.60-0.65wt%, and the content of P is less than or equal to 0.010wt%. In order to ensure the content of residual aluminum and titanium in the steel, the use level of final deoxidized aluminum and silicon-manganese alloy is controlled, the silicon iron only has the function of increasing Si, the alloy adopts low-aluminum alloy, and the Al content in the steel is controlled below 0.005 wt%.
According to the preparation method of the 55SiCrA wire rod for the automobile suspension spring, refining slag in the LF refining process is prepared according to SiO 2 25-30wt% of CaO, 48-55wt% of Al 2 O 3 The content of FeO and MnO is less than or equal to 0.8wt percent, and the alkalinity R of a slag refining system is controlled to be 2.5-3.0.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the RH furnace is mainly used for circulation degassing in the RH vacuum degassing process, alloy components are not regulated in principle, and only the components deviating from each other can be added with corresponding alloys for fine adjustment.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the mold flux of the crystallizer in the continuous casting process of the six-machine six-flow arc-shaped billet continuous casting machine adopts the mold flux special for peritectic steel, the starting pulling speed is controlled to be 0.60m/min, the process pulling speed is controlled to be 1.30m/min, the water flow rate of the crystallizer is 125 m/h, the stirring current at the head end of electromagnetic stirring is 250A, the frequency is 3Hz, the stirring at the tail end is 100A, the frequency is 18Hz, and the fluctuation of the liquid level in the crystallizer is less than or equal to +/-3 mm.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the casting blank is subjected to grinding treatment, the face grinding depth is 2mm, the corner inclined plane depth is more than or equal to 10mm, and the surface of the steel blank is ground to be smooth and free of burrs.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the total length of an air cooling wire loose coil cooling wire in a cooling control process is 105.3 meters, 10 groups of 30 centrifugal fans are arranged, 3 fans in each group are sequentially arranged in the left, the middle and the right, the air quantity of the fans can be independently adjusted, the power of the fans is 160KW, and the maximum air quantity is 120000 m/h. The air cooling line is provided with a heat preservation cover to realize delay cooling, the cooling speed range is 0.5-20 ℃/s, and the delay cooling and standard cooling can be realized. The air cooling line roller way is divided into 13 sections, the length of the first section is 3.5 meters, the lengths of the 2 nd section and the 12 th section are respectively 8.8 meters, the 13 th section is 5 meters, and each section of roller way is provided with an independent motor to realize the sectional control of the roller way speed. Except the first section of roller way, each of the other sections is provided with 2 heat preservation covers. The roller speed settings of each section of the stelmor air cooling line in this embodiment are shown in table 1:
table 1 stelmor air-cooled line section roller speed setting
The preparation method of the 55SiCrA wire rod for the automobile suspension spring according to the embodiment comprises the following steps of: the opening degree of the middle fans of the first four groups is 80%, and the opening degree of the fans at the two sides is 90%; the opening degree of the middle fans of the fifth group is 30%, and the opening degree of the fans at the two sides is 40%; the rest fans are turned off.
Table 2 stelmor air cooling line fan volume setting
The preparation method of the 55SiCrA wire rod for the automotive suspension spring according to the embodiment, and the opening/closing control of the heat preservation cover are shown in Table 3: the 1 st to 6 th section roller way heat preservation cover is opened, the 7 th to 12 th section roller way heat preservation cover is closed, and the 13 th section roller way heat preservation cover is opened.
TABLE 3 Stalmor air-cooled line insulation cover on/off control settings
The embodiment of the preparation method of the 55SiCrA wire rod for the automobile suspension spring, the temperatures of the left, middle and right three parts of the position coil are monitored by using a high-precision pyrometer, namely, the spinning temperature, 1 group of fans, 2 groups of fans, 3 groups of fans, 4 groups of fans, 5 groups of fans, 6 groups of fans, 7 groups of fans, 8 groups of fans, 9 groups of fans, 10 groups of fans and the position coil.
TABLE 4 temperature of the air-cooled roller table at each position
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the temperature of the wire rod starts to be stable at the position of the 3 rd group of fans, the temperature range of generating sorbite tissues is reached, and austenite starts to be converted into the sorbite tissues. The temperature of the left side, the middle side and the right side of the wire rod is extremely 3-11 ℃, the interlayer spacing of pearlite sheets converted in the temperature range tends to be consistent, and the sorbite rate, the grain size and the performance uniformity are high.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, which is disclosed by the embodiment, each circle of the prepared wire rod coil is 3.1-3.3 m long, the coil produced by the process is cut into one circle, the coil is segmented according to 300mm, 01-10 is marked according to the sequence, and the performance and the structure are inspected, so that the tensile strength is 1005-1045MPa and the extremely poor 37.0MPa are obtained; the shrinkage rate is 51.0-54.7%, and the rate is extremely poor at 3.7%; the sorbite proportion is 95-96% and the extremely poor is 1%; the grain size is 8.5 grade, and the depth of decarburized layer is 66.36-71.01 μm (less than or equal to 0.6% D). The performance test is shown in table 5:
TABLE 5 same circle performance organization
The metallographic images are shown in FIGS. 1 to 3, the grain size is 8.5 grade as seen in FIG. 1, the sorbite ratio is 95% as seen in FIG. 2, and the decarburized layer depth is 71 μm and 0.59% D as seen in FIG. 3.
The second embodiment is as follows:
the preparation method of the 55SiCrA wire rod for the automobile suspension spring comprises the following steps of: converter smelting, LF refining, RH vacuum degassing, continuous casting of a six-machine six-flow arc billet continuous casting machine, billet grinding, heating by a heat accumulating type heating furnace, high-pressure water dephosphorization, wire rod rolling and coil cooling control, bundling, weighing, listing and warehousing.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, si content in the spring steel 55SiCrA component is high, and reasonable heating, rolling and cooling control processes are adopted to reduce wire rod decarburization during production; the inherent characteristics of the stelmor air cooling line lead the cooling rate of the wire rod to be inconsistent under the same condition, and finally lead the uniformity of the wire rod structure and performance to be reduced, the wire rod is partially easy to generate a martensitic structure when the cooling rate is too high, and the partial sorbite quantity of the wire rod is insufficient when the cooling rate is too low and the performance is low. Therefore, the cold control process of the spring steel 55SiCrA should be combined with the comprehensive control of wire rod decarburization and property and tissue uniformity to ensure the indexes such as subsequent drawing property, fatigue property and the like.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the depth of the decarburized layer of the produced spring steel wire rod is reduced to below 0.6% D, the same-circle performance is extremely poor and controlled within 40MPa, the sorbite proportion is more than 95%, the uniformity is better, the wire rod decarburization is reduced, the problem that the tissue performance is extremely poor is solved, and the fatigue life of the wire rod is prolonged.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the tensile strength of the produced spring steel wire rod is 1005-1045MPa, the shrinkage rate is 51.0-54.7%, the sorbite proportion is 95-96%, the grain size is 8.5 level, the decarburization is less than or equal to 0.6% D, and the tissue and performance uniformity are greatly improved.
And a third specific embodiment:
according to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, which is disclosed in the second embodiment, the tapping temperature is 1650-1700 ℃ in the converter smelting process, the ladle argon bottom blowing is strongly stirred in the tapping process, and the deoxidizing agent and the alloy slag are added in sequence: after 40 tons of steel are tapped, 800kg of lime, 10kg of low-aluminum ferrosilicon, 9.4kg of silicomanganese, 8kg of high-purity ferrosilicon, 7.5kg of low-titanium high-chromium alloy are added, and after 50 tons of steel are tapped, 150kg of fluorite is added.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, ti, mo and Ni waste steel is forbidden to be added in the converter smelting process so as to prevent high-temperature oxides from being generated and reduce the service life of the finished spring. The steel tapping component is regulated according to the internal control lower limit to reduce carburetion in the refining process, the stirring is carried out to increase the nitrogen content, the content of C is 0.47-0.50wt%, the content of Si is 1.38-1.43wt%, the content of Mn is 0.60-0.65wt%, the content of Cr is 0.60-0.65wt%, and the content of P is less than or equal to 0.010wt%. In order to ensure the content of residual aluminum and titanium in the steel, the use level of final deoxidized aluminum and silicon-manganese alloy is controlled, the silicon iron only has the function of increasing Si, the alloy adopts low-aluminum alloy, and the Al content in the steel is controlled below 0.005 wt%.
The specific embodiment IV is as follows:
according to the preparation method of the 55SiCrA wire rod for the automotive suspension spring in the second embodiment, carbon powder, ferrosilicon powder or silicon carbide is adopted as a deoxidizer in the LF refining process, the white slag refining time is more than 15 minutes, and the deoxidizer is added in the LF refining process in sequence: 50kg of fluorite particles, 20kg of carbon powder and 65kg of silicon carbide are added in batches of 250kg of silica, 200kg of acid slag, 45kg of silicon carbide and 25kg of carbon powder 10 minutes before the refining is finished.
According to the preparation method of the 55SiCrA wire rod for the automobile suspension spring, refining slag in the LF refining process is prepared according to SiO 2 25-30wt% of CaO, 48-55wt% of Al 2 O 3 The content of FeO and MnO is less than or equal to 0.8wt percent, and the alkalinity R of a slag refining system is controlled to be 2.5-3.0.
Fifth embodiment:
according to the method for preparing the 55SiCrA wire rod for the automotive suspension spring, which is disclosed in the second embodiment, the components in the LF refining process are adjusted to 0.53-0.57wt% of C, 1.43-1.50wt% of Si, 0.63-0.68wt% of Mn, 0.63-0.68wt% of Cr, less than or equal to 0.015wt% of P, less than or equal to 0.015wt% of S, less than or equal to 0.005wt% of Al, less than or equal to 0.005wt% of Ti, less than or equal to 0.0008wt% of Ca, and the molten steel temperature is transferred to the next working procedure at 1602-1632 ℃.
Specific embodiment six:
according to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, which is disclosed in the second embodiment, the RH vacuum degassing process is that the vacuum maintaining time is 15-20 minutes when the vacuum degree is less than or equal to 67Pa, soft blowing is performed for more than 20 minutes after the vacuum is finished, 60-80kg of carbonized rice husk is added for heat preservation, and the temperature of molten steel is 1527-1547 ℃ to be transferred to the next working procedure.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the RH furnace is mainly used for circulation degassing in the RH vacuum degassing process, alloy components are not regulated in principle, and only the components deviating from each other can be added with corresponding alloys for fine adjustment.
Seventh embodiment:
according to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, which is disclosed in the second specific embodiment, the six-machine six-flow arc billet continuous casting machine is a six-machine six-flow arc 200 mm/200 mm billet continuous casting machine, the liquid level insertion depth is 100-120mm, argon is filled into the billet for purging 3min before casting, the whole process argon is protected, the continuous casting billet adopts static light reduction 15mm, the reduction of the 1# tension leveler is 0mm, the reduction of the 2# tension leveler is 3mm, the reduction of the 3# tension leveler is 4mm, the reduction of the 4# tension leveler is 5mm, and the reduction of the 5-6# tension leveler is 0mm.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the mold flux of the crystallizer in the continuous casting process of the six-machine six-flow arc-shaped billet continuous casting machine adopts the mold flux special for peritectic steel, the starting pulling speed is controlled to be 0.60m/min, the process pulling speed is controlled to be 1.30m/min, the water flow rate of the crystallizer is 125 m/h, the stirring current at the head end of electromagnetic stirring is 250A, the frequency is 3Hz, the stirring at the tail end is 100A, the frequency is 18Hz, and the fluctuation of the liquid level in the crystallizer is less than or equal to +/-3 mm.
Eighth embodiment:
according to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, which is disclosed in the second embodiment, the temperature of a heating preheating section of a regenerative heating furnace is 870-930 ℃, the temperature of a heating section is 980-1020 ℃, the temperature of a soaking section is 1010-1030 ℃, the heating time is 100-130min, and the residual oxygen content in the furnace is controlled below 1.5%.
Detailed description nine:
according to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, which is disclosed in the second embodiment, the cogging temperature of a wire rod in the rolling process is 900-980 ℃, the large reduction is more than or equal to 53mm, the temperature of a finishing mill group is 880-910 ℃, and the coiling and spinning temperature is 890-920 ℃.
Detailed description ten:
according to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, which is disclosed in the second embodiment, the controlled cooling adopts a Steyr air cooling line, an air cooling line roller way is divided into 13 sections, the length of the first section is 3.5 meters, the sections 2-12 are 8.8 meters respectively, the section 13 is 5 meters, the speed of the Steyr air cooling line roller is controlled to be 0.5m/s of the speed of the first section, the advance coefficient of the section 2-12 is 3%, and the advance coefficient of the section 13 is 0.9%.
According to the preparation method of the 55SiCrA wire rod for the automotive suspension spring, the total length of an air cooling wire loose coil cooling wire in a cooling control process is 105.3 meters, 10 groups of 30 centrifugal fans are arranged, 3 fans in each group are sequentially arranged in the left, the middle and the right, the air quantity of the fans can be independently adjusted, the power of the fans is 160KW, and the maximum air quantity is 120000 m/h. The air cooling line is provided with a heat preservation cover to realize delay cooling, the cooling speed range is 0.5-20 ℃/s, and the delay cooling and standard cooling can be realized. The air cooling line roller way is divided into 13 sections, the length of the first section is 3.5 meters, the lengths of the 2 nd section and the 12 th section are respectively 8.8 meters, the 13 th section is 5 meters, and each section of roller way is provided with an independent motor to realize the sectional control of the roller way speed. Except the first section of roller way, each of the other sections is provided with 2 heat preservation covers.
Eleventh embodiment:
the method for manufacturing a 55SiCrA wire rod for an automotive suspension spring according to the second embodiment comprises the following steps of 0.53-0.57wt% of C, 1.43-1.50wt% of Si, 0.64-0.70wt% of Mn, 0.64-0.70wt% of Cr, less than or equal to 0.015wt% of P, less than or equal to 0.015wt% of S, less than or equal to 0.10wt% of Ni, less than or equal to 0.08wt% of Cu, less than or equal to 0.010wt% of Mo, less than or equal to 0.005wt% of Al, less than or equal to 0.005wt% of Ti, and the balance of Fe.
Claims (3)
1. A preparation method of a 55SiCrA wire rod for an automobile suspension spring is characterized by comprising the following steps: the preparation method of the 55SiCrA wire rod for the automobile suspension spring comprises the following steps: converter smelting, LF refining, RH vacuum degassing, continuous casting of a six-machine six-flow arc billet continuous casting machine, billet grinding, heating by a heat accumulating type heating furnace, high-pressure water dephosphorization, wire rod rolling and coil cooling control, bundling, weighing, listing and warehousing;
in the LF refining process, carbon powder, ferrosilicon powder or silicon carbide is used as a deoxidizer, the white slag refining time is more than 15 minutes, and the deoxidizer is added in the LF refining process in sequence: 50-52kg of fluorite particles, 20-21kg of carbon powder and 65-68kg of silicon carbide are added in a first power transmission mode, 250-255kg of silica, 200-205kg of acid slag, 45-47kg of silicon carbide and 25-26kg of carbon powder are added in batches 10 minutes before refining is finished;
the components in the LF refining process are adjusted to 0.53-0.57wt% of C, 1.43-1.50wt% of Si, 0.63-0.68wt% of Mn, 0.63-0.68wt% of Cr, less than or equal to 0.015wt% of P, less than or equal to 0.015wt% of S, less than or equal to 0.005wt% of Al, less than or equal to 0.005wt% of Ti, less than or equal to 0.0008wt% of Ca, and the temperature of molten steel is transferred to the next working procedure at 1602-1632 ℃;
the six-machine six-stream arc billet continuous casting machine is a six-machine six-stream arc 200mm square billet continuous casting machine, the liquid level insertion depth is 100-120mm, argon is filled into the middle bag for purging 3min before casting, the whole process is protected by argon, the continuous casting billet adopts static light reduction 15mm, the reduction of a 1# withdrawal and straightening machine is 0mm, the reduction of a 2# withdrawal and straightening machine is 3mm, the reduction of a 3# withdrawal and straightening machine is 4mm, the reduction of a 4# withdrawal and straightening machine is 5mm, and the reduction of a 5-6# withdrawal and straightening machine is 0mm;
the cogging temperature in the wire rolling process is 900-980 ℃, the large rolling reduction is more than or equal to 53mm, the temperature of a finishing mill group is controlled to 880-910 ℃, and the coil spinning temperature is 890-920 ℃;
the control cooling adopts a Steyr air cooling line, an air cooling line roller way is divided into 13 sections, the length of the first section is 3.5 meters, the lengths of the 2 nd section and the 12 th section are 8.8 meters respectively, the 13 th section is 5 meters, the speed of the Steyr air cooling line roller is controlled to be 0.5m/s of the first section, the advance coefficient of the 2 nd section to the 12 th section is 3%, and the advance coefficient of the 13 th section is 0.9%;
the 55SiCrA wire rod for the automotive suspension spring comprises 0.53-0.57wt% of C, 1.43-1.50wt% of Si, 0.64-0.70wt% of Mn, 0.64-0.70wt% of Cr, less than or equal to 0.015wt% of P, less than or equal to 0.015wt% of S, less than or equal to 0.10wt% of Ni, less than or equal to 0.08wt% of Cu, less than or equal to 0.010wt% of Mo, less than or equal to 0.005wt% of Al, less than or equal to 0.005wt% of Ti and the balance of Fe;
the heat accumulating type heating furnace heats the preheating section temperature 870-930 ℃, the heating section temperature 980-1020 ℃, the soaking section temperature 1010-1030 ℃ and the heating time 100-130min, and the residual oxygen content in the furnace is controlled below 1.5%;
the air quantity of the fans is controlled to be 80% of the opening degree of the middle fans of the front four groups, and 90% of the opening degree of the fans at the two sides; the opening degree of the middle fans of the fifth group is 30%, and the opening degree of the fans at the two sides is 40%; the rest fans are closed;
the on/off of the heat preservation cover is controlled to be that the heat preservation cover of the roller way of the 1 st section to the 6 th section is opened, the heat preservation cover of the roller way of the 7 th section to the 12 th section is closed, and the heat preservation cover of the roller way of the 13 th section is opened.
2. The method for manufacturing the 55SiCrA wire rod for the automotive suspension spring according to claim 1, which is characterized in that: steel tapping temperature 1650-1700 ℃ in the converter smelting process, steel ladle argon bottom blowing strong stirring in the steel tapping process, deoxidizing agent and alloy slag adding sequence: after 40 tons of steel are tapped, 800-810kg of lime, 10-10.5kg of low-aluminum ferrosilicon, 9.4-9.6kg of ferrosilicon, 8-8.5kg of high-purity ferrosilicon, 7.5-8kg of low-titanium high-chromium alloy are added, and after 50 tons of steel are tapped, 150-155kg of fluorite is added.
3. The method for manufacturing the 55SiCrA wire rod for the automotive suspension spring according to claim 2, which is characterized in that: the RH vacuum degassing process is that the vacuum maintaining time is 15-20 minutes when the vacuum degree is less than or equal to 67Pa, soft blowing is carried out for more than 20 minutes after the vacuum is finished, 60-80kg of carbonized rice husk is added for heat preservation, and the temperature of molten steel is 1527-1547 ℃ to be transferred to the next working procedure.
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