CN117230384A - Method for reducing processing cracks of wheel rim steel produced by sheet billet continuous casting and rolling process - Google Patents
Method for reducing processing cracks of wheel rim steel produced by sheet billet continuous casting and rolling process Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims abstract description 71
- 229910001327 Rimmed steel Inorganic materials 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000009749 continuous casting Methods 0.000 title claims abstract description 45
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 240
- 239000010959 steel Substances 0.000 claims abstract description 240
- 230000008569 process Effects 0.000 claims abstract description 34
- 238000003723 Smelting Methods 0.000 claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 238000010079 rubber tapping Methods 0.000 claims description 48
- 239000002893 slag Substances 0.000 claims description 43
- 238000007670 refining Methods 0.000 claims description 30
- 229910052799 carbon Inorganic materials 0.000 claims description 24
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 11
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 11
- 239000004571 lime Substances 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 2
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 238000003754 machining Methods 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 abstract description 2
- 239000000725 suspension Substances 0.000 abstract description 2
- 239000010936 titanium Substances 0.000 description 16
- 230000035882 stress Effects 0.000 description 14
- 238000002788 crimping Methods 0.000 description 11
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 229910000616 Ferromanganese Inorganic materials 0.000 description 9
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 9
- 229910052791 calcium Inorganic materials 0.000 description 9
- 239000011575 calcium Substances 0.000 description 9
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 9
- 230000004907 flux Effects 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
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- 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
The invention belongs to the technical field of ferrous metallurgy, in particular to a method for reducing machining cracks of wheel rim steel produced by a sheet billet continuous casting and rolling process. The method comprises the steps of controlling smelting and rolling processes, wherein the content of acid-soluble aluminum in the smelting process is controlled to be within a range of 0.012-0.018%, the content of P, S in steel is reduced, the content of P in the steel is controlled to be within 0.015%, and the content of S in the steel is controlled to be within 0.008%; in the rolling process, the final rolling temperature, the external dimension and the like are controlled in a key way. The invention is suitable for production under the conditions of sheet billet continuous casting and rolling process and equipment, and can effectively reduce the processing crack defects of wheel rim steel in the processes of rolling, stamping, suspension pressing, expanding diameter and other deep processing processes by precisely controlling key process parameters in a target zone under the condition that smelting, steel rolling process and equipment conditions are kept stable and normal, thereby ensuring good surface quality of the rim.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for reducing machining cracks of wheel rim steel produced by a sheet billet continuous casting and rolling process.
Background
In the prior art, the production method of the wheel rim steel by a sheet billet continuous casting and rolling process comprises the steps of adding raw materials into molten steel according to mass percent, smelting by a converter, refining by blowing argon into a ladle bottom, refining by an LF furnace to obtain qualified molten steel, casting the molten steel into a casting blank by a continuous casting process, and rolling the casting blank into the wheel rim steel plate with qualified performance by a rolling process.
The main reason for the processing cracking of the wheel rim steel produced by the sheet billet continuous casting and rolling process is as follows: in the deep processing process of the steel plate, the micro-cracks are hidden on the surface and the inside of the steel plate to expand and crack, so that the reduction of the original incidence rate of the micro-crack source of the steel plate is a fundamental measure for solving the problem of the processing cracking of the rim steel of the wheel.
The problem of processing cracking of wheel rim steel produced by a sheet billet continuous casting and rolling process is mainly influenced by the contents of C, ti and Als in the steel, wherein when the content of C is higher than 0.08%, ceq (Ceq calculation method: ceq=C+0.02Mn+0.04Ni-0.1 Si-0.04Cr-0.1 Mo-0.7S) enters a peritectic zone (Ceq: 0.065-0.165%), peritectic reaction occurs to cause the blank shell to shrink unevenly, an air gap is easily formed between a primary solidified blank shell and a crystallizer wall prematurely, and a gap between a casting blank and a crystallizer copper plate is influenced by ferrostatic pressure of molten steel, so that a local gap is pressed. The premature formation and the partial compression of the air gap can cause uneven shrinkage and uneven thickness of the shell, the formation of the air gap also prevents the heat transfer of the casting powder, and surface cracks and internal cracks of the continuous casting blank are extremely easy to occur in the casting process, so that the continuous casting blank becomes a crack source of the hot rolled plate, and even steel leakage accidents occur when the cracks are serious.
The Ti content of the wheel rim steel is higher than 0.10%, and when the titanium-containing steel is poured by a continuous casting machine, the Ti is contained in the steel]Weak slag-metal interface reaction with the protecting slag, and the alloy is [ Ti in steel]Mass fraction is reduced to produce TiO 2 、TiN、Ti[C,N]The compound with the same high melting point enters the protective slag, the alkalinity and viscosity of the protective slag are increased, the melting point is increased, the physical properties of the protective slag are changed, and the lubricating and heat transfer functions of the protective slag are adversely affected.
Since Al has a higher reducibility than Si, when Al is contained in the rim steel of the wheel]When too high, [ Al ] in steel]Will be with SiO in the mold flux 2 Generating slag-gold interface reaction to generate Al 2 O 3 Into the mold flux, resulting in Al in the mold flux 2 O 3 Increased content of SiO 2 The content is reduced, and the protecting slag is formed by initial CaO-SiO 2 Conversion of radicals to CaO-SiO 2 -Al 2 O 3 Radicals, or CaO-Al 2 O 3 The change of the composition of the mold flux inevitably causes great change of physical properties, thereby affecting the lubrication and heat transfer functions of the mold flux.
Under the multiple influences of C, ti and Al elements in steel, the solidification shrinkage of a primary blank shell is uneven, the physical property of mold covering slag is changed, the function is reduced, the friction force of a casting blank in the mold is increased, the heat conduction uniformity is reduced, cracks on the surface and inside of the casting blank are increased, the cracks are difficult to eliminate in the rolling process, and the cracks are left in a steel plate and become the source of wheel rim steel processing cracks.
For the processing cracks of the wheel rim steel, the wheel rim steel is used after being repaired when the wheel rim steel is light, and the wheel rim steel is directly judged to be wasted when the wheel rim steel is heavy, so that economic losses are caused. If aging cracks are generated, the rim is cracked after being delivered to a user, so that not only is the loss of the user compensated, but also the enterprise is influenced very badly.
The main marks of the wheel rim steel are 380CL, 440CL, 490CL, 540CL, 590CL and the like, and aiming at three typical marks of 380CL, 440CL and 540CL, the invention describes the method for reducing the processing cracks of the wheel rim steel from the aspects of optimizing steel plate smelting, rolling and process, and can effectively reduce the processing cracks of the wheel rim steel.
Disclosure of Invention
The invention aims to provide a method for reducing processing cracks of wheel rim steel produced by a sheet billet continuous casting and rolling process. The contents of C, als and Ti in the steel are precisely controlled in a narrow interval in the smelting process, and on the basis of meeting the national standard of the performance of the original material of the wheel rim steel hot rolled strip product, the quality of the product after the wheel rim product is prepared by deep processing can be further improved, and the occurrence rate of processing cracks is reduced.
The technical scheme of the invention is as follows:
the method for reducing the processing cracks of the wheel rim steel produced by the sheet billet continuous casting and rolling process comprises converter smelting, LF furnace refining, casting blank and rolling. The method also comprises the control of C, mn, P, S, ti, als content in the steel plate smelting process, and the control of the final rolling temperature, the crimping temperature, the width and the thickness of the steel plate in the rolling process.
The steel plate smelting process comprises the following chemical components in percentage by mass: c:0.04 to 0.06 percent, mn:1.00 to 1.60 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.008 percent, ti:0.010 to 0.040%, als: 0.012-0.018%, and the balance of Fe.
In the above scheme, the method further comprises:
the chemical components in the steel plate smelting process are calculated according to mass percent, and for 380CL wheel rim steel, C:0.04 to 0.06 percent, mn:1.00 to 1.10 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.008 percent, ti:0.010 to 0.020%, als: 0.012-0.018%, and the balance of Fe.
The chemical components in the steel plate smelting process are calculated according to mass percent, and for 440CL wheel rim steel, C:0.04 to 0.06 percent, mn:1.20 to 1.30 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.008 percent, ti:0.015 to 0.025 percent, als: 0.012-0.018%, and the balance of Fe.
The chemical components in the steel plate smelting process are calculated according to mass percent, and for 540CL wheel rim steel, C:0.04 to 0.06 percent, mn:1.50 to 1.60 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.008 percent, ti:0.030 to 0.040 percent, als: 0.012-0.018%, and the balance of Fe.
The CaO content in converter slag is improved in the smelting process, the slag alkalinity is controlled to be 3.0-3.5, a slide plate is adopted to stop slag, slag-free tapping is realized, molten steel rephosphorization is avoided, and the P content in steel is lower than 0.015%.
In the LF refining process, the lime addition amount is more than or equal to 2500kg, the ton steel addition amount is more than or equal to 17.24kg/t, and the addition amount is calculated according to 145-155 t of tapping amount of a 120t converter; controlling the alkalinity of refining slag between 4.0 and 6.0, improving the desulfurization efficiency of molten steel and enabling the S content in the steel to be lower than 0.008 percent.
The final rolling temperature is controlled between 825 and 855 ℃ in the rolling process, the curling temperature is controlled between 565 and 595 ℃, the width tolerance of the steel plate is controlled between +10 and 15mm, and the thickness tolerance of the steel plate is controlled between-0.05 and +0.1 mm.
The yield strength of the 380CL wheel rim steel is 330-385MPa, the tensile strength is 429-470MPa, and the elongation is 33-38%; the yield strength of 440CL wheel rim steel is 361-390MPa, the tensile strength is 473-508MPa, and the elongation is 30-35%;540CL wheel rim steel has yield strength of 425-447MPa, tensile strength of 569-583MPa and elongation of 25-29%.
The circumferential stress of the steel of the rim of the 380CL wheel is controlled between 465 and 485MPa, and the axial stress is controlled between 375 and 384 MPa; the circumferential stress of the 440CL wheel rim steel is controlled between 467 and 482MPa, and the axial stress is controlled between 378 and 386 MPa; the circumferential stress of the 540CL wheel rim steel is controlled between 492 and 512MPa, and the axial stress is controlled between 409 and 423 MPa; the incidence of deep processing cracks is less than 0.52%.
The invention has the advantages that:
1. through the accurate control of the narrow component interval of C, P, S, als, ti content in steel, especially the accurate control of the Als content, effective control measures are implemented for each link of converter, refining and continuous casting, so that the Als content in the steel is controlled to be in the interval of 0.012% -0.018%. The Als content reaches more than 0.012 percent, so that the Al element can play roles of improving the heat deformation capacity, refining grains, ensuring the elongation to reach the standard stably and the like in the rolling process, and the hot-rolled steel plate has good processing performance.
2. By summarizing a large amount of process optimization adjustment data and quality feedback data in the deep processing process of manufacturing the rim in the production of the wheel rim steel by the sheet billet continuous casting and rolling process, the method discovers that on the basis of accurately controlling the Ti content in a narrow interval which is 0.003-0.008% higher than the lower limit of the designed chemical composition, the C content is controlled in a range of 0.04-0.06%, and the Als content in the steel is in a range of 0.012-0.018%, the physical performance caused by the change of the covering slag component is not obviously deteriorated, the lubricating and heat transfer functions of the covering slag are stable, the crack defect incidence rate of casting blanks and steel plates is low, the deep processing crack incidence rate of the wheel rim steel is low, and the comprehensive performance of the product is good.
3. The wheel rim steel produced by the method in the sheet billet continuous casting and rolling production line has various performance indexes which stably meet the standard requirements, the deep processing performance is obviously improved, and the occurrence rate of deep processing cracks is reduced from 35.57 percent before improvement to within 0.52 percent.
Detailed Description
Examples 1-9, wherein examples 1-3 were 380CL wheel rim steels, examples 4-6 were 440CL wheel rim steels, and examples 7-9 were 540CL wheel rim steels.
The smelting process flow for reducing the production of wheel rim steel by the sheet billet continuous casting and rolling process comprises the following steps: 120t top-bottom combined blowing converter, ladle bottom blowing argon refining, LF furnace refining and sheet billet continuous casting and rolling machine.
The method for reducing the processing cracks of the wheel rim steel produced by the sheet billet continuous casting and rolling process comprises the steps of controlling the C, mn, P, S, ti, als content in the steel plate smelting process, controlling the finishing temperature, the crimping temperature, the width and the thickness of the steel plate in the rolling process, and specifically comprises the following steps:
example 1
For 380CL wheel rim steel, the carbon content of the converter endpoint in the steel plate smelting process is 0.030%, the alkalinity of converter slag is 3.0, a slide plate is adopted to stop slag and realize slag-free tapping, so that the P content in the steel is controlled to be 0.012%, and the rephosphorization amount of molten steel is 0; 1800kg of low-carbon ferromanganese is added after tapping of the converter, the adding amount of ton steel is 12.41kg/t (the adding amount reference of ton steel is that the tapping amount of the converter is 120t, 145-155 t), the Mn content in the steel is controlled to be 1.02%, and the C content in the steel is controlled to be 0.041%.
The addition amount of refined lime in an LF furnace is more than or equal to 2500kg, the addition amount of ton steel is more than or equal to 17.24kg/t (reference of the addition amount of ton steel is 120t converter tapping amount 145-155 t), the alkalinity of refining slag is controlled to be 5.2, the S content in steel is controlled to be 0.0023%, 100kg of ferrotitanium is added before calcium treatment, the addition amount of ton steel is 0.69kg/t (reference of the addition amount of ton steel is 120t converter tapping amount 145-155 t), the Ti content in steel is controlled to be 0.016%, aluminum wire 120kg is added after molten steel enters the LF furnace refining furnace, and the Als content is controlled to be 0.0158%.
Molten steel is poured by a sheet billet continuous casting machine to form a steel billet, the superheat degree is controlled to be 17 ℃, and the pulling speed is controlled to be 3.6m/min.
Rolling the steel billet into a steel plate by a sheet billet continuous casting and rolling machine, wherein the final rolling temperature is controlled to be 837 ℃; the crimping temperature is controlled to 582 ℃; the width tolerance of the steel plate is controlled to be +11mm, and the thickness tolerance of the steel plate is controlled to be between-0.02 mm and +0.05mm.
Example 2
For 380CL wheel rim steel, the carbon content of the converter endpoint in the steel plate smelting process is 0.035%, the alkalinity of converter slag is 3.1, a slide plate is adopted to stop slag and realize slag-free tapping, so that the P content in the steel is controlled to be 0.012%, and the rephosphorization amount of molten steel is 0; 1800kg of low-carbon ferromanganese is added after tapping of the converter, the adding amount of ton steel is 12.41kg/t (the adding amount reference of ton steel is that the tapping amount of the converter is 120t, 145-155 t), the Mn content in the steel is controlled to be 1.05%, and the C content in the steel is controlled to be 0.046%.
The addition amount of refined lime in an LF furnace is more than or equal to 2500kg, the addition amount of ton steel is more than or equal to 17.24kg/t (reference of the addition amount of ton steel is 120t converter tapping amount 145-155 t), the alkalinity of refining slag is controlled to be 5.5, the S content in steel is controlled to be 0.0015%, 100kg of ferrotitanium is added before calcium treatment, the addition amount of ton steel is 0.69kg/t (reference of the addition amount of ton steel is 120t converter tapping amount 145-155 t), the Ti content in steel is controlled to be 0.014%, the aluminum wire 120kg is added after molten steel enters the LF furnace refining furnace, and the Als content is controlled to be 0.0162%.
Molten steel is poured by a sheet billet continuous casting machine to form a steel billet, the superheat degree is controlled to be 21 ℃, and the pulling speed is controlled to be 3.6m/min.
Rolling the steel billet into a steel plate by a sheet billet continuous casting and rolling machine, wherein the final rolling temperature is controlled to be 840 ℃; the crimping temperature is controlled to 579 ℃; the width tolerance of the steel plate is controlled to be +13mm, and the thickness tolerance of the steel plate is controlled to be between-0.01 mm and +0.04 mm.
Example 3
For 380CL wheel rim steel, the carbon content of the converter endpoint in the steel plate smelting process is 0.040%, the alkalinity of converter slag is 3.3, a slide plate is adopted to stop slag and realize slag-free tapping, so that the P content in the steel is controlled to be 0.011%, and the rephosphorization amount of molten steel is 0; 1800kg of low-carbon ferromanganese is added after tapping of the converter, the adding amount of ton steel is 12.41kg/t (the adding amount reference of ton steel is that the tapping amount of the converter is 120t, 145-155 t), the Mn content in the steel is controlled to be 1.00%, and the C content in the steel is controlled to be 0.052%.
The addition amount of refined lime in an LF furnace is more than or equal to 2500kg, the addition amount of ton steel is more than or equal to 17.24kg/t (the addition amount of ton steel is referenced as 120t converter tapping amount 145-155 t), the alkalinity of refining slag is controlled to be 5.4, the S content in steel is controlled to be 0.0032%, 100kg of ferrotitanium is added before calcium treatment, the addition amount of ton steel is 0.69kg/t (the addition amount of ton steel is referenced as 120t converter tapping amount 145-155 t), the Ti content in steel is controlled to be 0.015%, the aluminum wire 120kg is added after molten steel enters the LF furnace refining furnace, and the Als content is controlled to be 0.0147%.
Molten steel is poured by a sheet billet continuous casting machine to form a steel billet, the superheat degree is controlled to be 15 ℃, and the pulling speed is controlled to be 3.6m/min.
Rolling the steel billet into a steel plate by a sheet billet continuous casting and rolling machine, wherein the final rolling temperature is controlled to be 839 ℃ in the rolling process; the crimping temperature is controlled to 577 ℃; the width tolerance of the steel plate is controlled to be +10mm, and the thickness tolerance of the steel plate is controlled to be between-0.03 mm and +0.03 mm.
Example 4
For 440CL wheel rim steel, the carbon content of the converter endpoint in the steel plate smelting process is 0.033%, the alkalinity of converter slag is 3.2, a slide plate is adopted to stop slag and realize slag-free tapping, so that the P content in the steel is controlled to be 0.013%, and the rephosphorization amount of molten steel is 0; 2200kg of low-carbon ferromanganese is added after tapping of the converter, the adding amount of ton steel is 15.17kg/t (the adding amount reference of ton steel is that the tapping amount of the converter is 120t, 145-155 t), the Mn content in the steel is controlled to be 1.24%, and the C content in the steel is controlled to be 0.046%.
The addition amount of refined lime in an LF furnace is more than or equal to 2500kg, the addition amount of ton steel is more than or equal to 17.24kg/t (reference of the addition amount of ton steel is 120t converter tapping amount 145-155 t), the alkalinity of refining slag is controlled to be 4.9, the S content in steel is controlled to be 0.0017%, 130kg of ferrotitanium is added before calcium treatment, the addition amount of ton steel is 0.89kg/t (reference of the addition amount of ton steel is 120t converter tapping amount 145-155 t), the Ti content in steel is controlled to be 0.018%, aluminum wire 120kg is added after molten steel enters the LF furnace refining furnace, and the Als content is controlled to be 0.0152%.
Molten steel is poured by a sheet billet continuous casting machine to form a steel billet, the superheat degree is controlled to be 20 ℃, and the pulling speed is controlled to be 3.6m/min.
Rolling the steel billet into a steel plate by a sheet billet continuous casting and rolling machine, wherein the final rolling temperature is controlled to 842 ℃; the crimping temperature is controlled to be 580 ℃; the width tolerance of the steel plate is controlled to be +11mm, and the thickness tolerance of the steel plate is controlled to be between-0.04 mm and +0.02 mm.
Example 5
For 440CL wheel rim steel, the carbon content of the converter endpoint in the steel plate smelting process is 0.037%, the alkalinity of converter slag is 3.1, a slide plate is adopted to stop slag and realize slag-free tapping, so that the P content in the steel is controlled to be 0.010%, and the rephosphorization amount of molten steel is 0; 2200kg of low-carbon ferromanganese is added after tapping of the converter, the adding amount of ton steel is 15.17kg/t (the adding amount reference of ton steel is that the tapping amount of the converter is 120t, 145-155 t), the Mn content in the steel is controlled to be 1.27%, and the C content in the steel is controlled to be 0.048%.
The addition amount of refined lime in an LF furnace is more than or equal to 2500kg, the addition amount of ton steel is more than or equal to 17.24kg/t (reference of the addition amount of ton steel is 120t converter tapping amount 145-155 t), the alkalinity of refining slag is controlled to be 5.3, the S content in steel is controlled to be 0.0022%, 130kg of ferrotitanium is added before calcium treatment, the addition amount of ton steel is 0.89kg/t (reference of the addition amount of ton steel is 120t converter tapping amount 145-155 t), the Ti content in steel is controlled to be 0.020%, the aluminum wire 120kg is added after molten steel enters the LF furnace refining furnace, and the Als content is controlled to be 0.0166%.
Molten steel is poured by a sheet billet continuous casting machine to form a steel billet, the superheat degree is controlled to be 22 ℃, and the pulling speed is controlled to be 3.6m/min.
Rolling the steel billet into a steel plate by a sheet billet continuous casting and rolling machine, wherein the final rolling temperature is controlled to 844 ℃; the crimping temperature is controlled to 576 ℃; the width tolerance of the steel plate is controlled to be +12mm, and the thickness tolerance of the steel plate is controlled to be between-0.02 mm and +0.04 mm.
Example 6
For 440CL wheel rim steel, the carbon content of the converter endpoint in the steel plate smelting process is 0.032%, the alkalinity of converter slag is 3.3, a slide plate is adopted to stop slag and realize slag-free tapping, so that the P content in the steel is controlled to be 0.009%, and the rephosphorization amount of molten steel is 0; 2200kg of low-carbon ferromanganese is added after tapping of the converter, the adding amount of ton steel is 15.17kg/t (the adding amount reference of ton steel is that the tapping amount of the converter is 120t, 145-155 t), the Mn content in the steel is controlled to be 1.25%, and the C content in the steel is controlled to be 0.050%.
The addition amount of refined lime in an LF furnace is more than or equal to 2500kg, the addition amount of ton steel is more than or equal to 17.24kg/t (reference of the addition amount of ton steel is 120t converter tapping amount 145-155 t), the alkalinity of refining slag is controlled to be 5.8, the S content in steel is controlled to be 0.0030%, 130kg of ferrotitanium is added before calcium treatment, the addition amount of ton steel is 0.89kg/t (reference of the addition amount of ton steel is 120t converter tapping amount 145-155 t), the Ti content in steel is controlled to be 0.022%, aluminum wire 120kg is added after molten steel enters the LF furnace refining furnace, and the Als content is controlled to be 0.0152%.
Molten steel is poured by a sheet billet continuous casting machine to form a steel billet, the superheat degree is controlled to be 23 ℃, and the pulling speed is controlled to be 3.6m/min.
Rolling the steel billet into a steel plate by a sheet billet continuous casting and rolling machine, wherein the final rolling temperature is controlled to be 837 ℃; the crimping temperature is controlled to be 575 ℃; the width tolerance of the steel plate is controlled to be +13mm, and the thickness tolerance of the steel plate is controlled to be between-0.04 mm and +0.02 mm.
Example 7
For 540CL wheel rim steel, the carbon content of the converter endpoint in the steel plate smelting process is 0.035%, the alkalinity of converter slag is 3.0, a slide plate is adopted to stop slag and realize slag-free tapping, so that the P content in the steel is controlled to be 0.011%, and the rephosphorization amount of molten steel is 0; 2800kg of low-carbon ferromanganese is added after tapping of the converter, the adding amount of ton steel is 19.31kg/t (the adding amount of ton steel is referenced as 145-155 t of tapping amount of the converter of 120 t), the Mn content in the steel is controlled to be 1.53%, and the C content in the steel is controlled to be 0.052%.
The addition amount of refined lime in an LF furnace is more than or equal to 2500kg, the addition amount of ton steel is more than or equal to 17.24kg/t (the addition amount of ton steel is referenced to be 120t converter tapping amount of 145-155 t), the alkalinity of refining slag is controlled to be 5.1, the S content in steel is controlled to be 0.0019%, 220kg of ferrotitanium is added before calcium treatment, the addition amount of ton steel is 1.52kg/t (the addition amount of ton steel is referenced to be 120t converter tapping amount of 145-155 t), the Ti content in steel is controlled to be 0.034%, the aluminum wire 120kg is added after molten steel enters the LF furnace refining furnace, and the Als content is controlled to be 0.0162%.
Molten steel is poured by a sheet billet continuous casting machine to form a steel billet, the superheat degree is controlled to be 24 ℃, and the pulling speed is controlled to be 3.6m/min.
Rolling the steel billet into a steel plate by a sheet billet continuous casting and rolling machine, wherein the final rolling temperature is controlled to 842 ℃; the crimping temperature is controlled to 570 ℃; the width tolerance of the steel plate is controlled to be +10mm, and the thickness tolerance of the steel plate is controlled to be between-0.01 mm and +0.04 mm.
Example 8
For 540CL wheel rim steel, the carbon content of the converter endpoint in the steel plate smelting process is 0.034%, the alkalinity of converter slag is 3.1, a slide plate is adopted to stop slag and realize slag-free tapping, so that the P content in the steel is controlled to be 0.011%, and the rephosphorization amount of molten steel is 0; 2800kg of low-carbon ferromanganese is added after tapping of the converter, the adding amount of ton steel is 19.31kg/t (the adding amount of ton steel is referenced as 145-155 t of tapping amount of the converter of 120 t), the Mn content in the steel is controlled to be 1.58%, and the C content in the steel is controlled to be 0.055%.
The addition amount of refined lime in an LF furnace is more than or equal to 2500kg, the addition amount of ton steel is more than or equal to 17.24kg/t (the addition amount of ton steel is referenced to be 120t converter tapping amount of 145-155 t), the alkalinity of refining slag is controlled to be 5.6, the S content in steel is controlled to be 0.0015%, 220kg of ferrotitanium is added before calcium treatment, the addition amount of ton steel is 1.52kg/t (the addition amount of ton steel is referenced to be 120t converter tapping amount of 145-155 t), the Ti content in steel is controlled to be 0.037%, the aluminum wire 120kg is added after molten steel enters the LF furnace refining furnace, and the Als content is controlled to be 0.0149%.
Molten steel is poured by a sheet billet continuous casting machine to form a steel billet, the superheat degree is controlled to be 18 ℃, and the pulling speed is controlled to be 3.6m/min.
Rolling the steel billet into a steel plate by a sheet billet continuous casting and rolling machine, wherein the final rolling temperature is controlled to be 831 ℃; the crimping temperature is controlled to 573 ℃; the width tolerance of the steel plate is controlled to be +11mm, and the thickness tolerance of the steel plate is controlled to be between-0.03 mm and +0.03 mm.
Example 9
For 540CL wheel rim steel, the carbon content of the converter endpoint in the steel plate smelting process is 0.038%, the alkalinity of converter slag is 3.0, a slide plate is adopted to stop slag and realize slag-free tapping, so that the P content in the steel is controlled to be 0.012%, and the rephosphorization amount of molten steel is 0; 2800kg of low-carbon ferromanganese is added after tapping of the converter, the adding amount of ton steel is 19.31kg/t (the adding amount of ton steel is referenced as 145-155 t of tapping amount of the converter of 120 t), the Mn content in the steel is controlled to be 1.56%, and the C content in the steel is controlled to be 0.054%.
The addition amount of refined lime in an LF furnace is more than or equal to 2500kg, the addition amount of ton steel is more than or equal to 17.24kg/t (reference of the addition amount of ton steel is 120t converter tapping amount 145-155 t), the alkalinity of refining slag is controlled to be 5.2, the S content in steel is controlled to be 0.0022%, 220kg of ferrotitanium is added before calcium treatment, the addition amount of ton steel is 1.52kg/t (reference of the addition amount of ton steel is 120t converter tapping amount 145-155 t), the Ti content in steel is controlled to be 0.035%, the aluminum wire 120kg is added after molten steel enters the LF furnace refining furnace, and the Als content is controlled to be 0.0167%.
Molten steel is poured by a sheet billet continuous casting machine to form a steel billet, the superheat degree is controlled to be 20 ℃, and the pulling speed is controlled to be 3.6m/min.
Rolling the steel billet into a steel plate by a sheet billet continuous casting and rolling machine, wherein the final rolling temperature is controlled to be 838 ℃ in the rolling process; the crimping temperature is controlled to 577 ℃; the width tolerance of the steel plate is controlled to be +11mm, and the thickness tolerance of the steel plate is controlled to be between-0.02 mm and +0.04 mm.
The factory performance indexes of the steel plates are shown in table 1; the user deep processing index and crack occurrence rate are shown in table 2.
Table 1: steel plate delivery performance index
| Rolling specification mm | Yield strength MPa | Tensile strength MPa | Elongation percentage% | |
| Example 1 | 8.4 | 330 | 429 | 38 |
| Example 2 | 8.4 | 345 | 433 | 35 |
| Example 3 | 8.4 | 385 | 470 | 33 |
| Example 4 | 7.4 | 373 | 493 | 35 |
| Example 5 | 7.4 | 361 | 473 | 34 |
| Example 6 | 7.4 | 390 | 508 | 30 |
| Example 7 | 5.5 | 447 | 583 | 29 |
| Example 8 | 5.5 | 432 | 575 | 27 |
| Example 9 | 5.5 | 425 | 569 | 25 |
Table 2: deep processing index and crack incidence rate of user
| Hoop stress MPa | Axial stress MPa | Crack occurrence% | |
| Example 1 | 470 | 381 | 0.39 |
| Example 2 | 465 | 375 | 0.41 |
| Example 3 | 485 | 384 | 0.42 |
| Example 4 | 473 | 378 | 0.37 |
| Example 5 | 467 | 382 | 0.45 |
| Example 6 | 482 | 386 | 0.33 |
| Example 7 | 504 | 412 | 0.42 |
| Example 8 | 492 | 409 | 0.40 |
| Example 9 | 512 | 423 | 0.34 |
As shown in Table 2, after the wheel rim steel and the steel plate produced by the method are subjected to deep processing such as rounding, stamping, suspension pressing and the like, the hoop stress of the 380CL wheel rim steel is controlled between 465 MPa and 485MPa, and the axial stress is controlled between 375 MPa and 384 MPa; the circumferential stress of the 440CL wheel rim steel is controlled between 467 and 482MPa, and the axial stress is controlled between 378 and 386 MPa; the circumferential stress of the 540CL wheel rim steel is controlled between 492 and 512MPa, and the axial stress is controlled between 409 and 423 MPa; the crack occurrence rate is controlled within 0.52%, so that the processing crack occurrence rate of the wheel rim is effectively reduced.
The above description is only of specific embodiments of the present invention, and the various illustrations do not limit the essential content of the present invention.
Claims (7)
1. The method for reducing the processing cracks of the wheel rim steel produced by the sheet billet continuous casting and rolling process comprises converter smelting, LF furnace refining, casting blank and rolling, and is characterized by comprising the control of C, mn, P, S, ti, als content in the steel plate smelting process, and the control of finishing temperature, curling temperature, steel plate width and thickness in the rolling process;
the steel plate smelting process comprises the following chemical components in percentage by mass: c:0.04 to 0.06 percent, mn:1.00 to 1.60 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.008 percent, ti:0.010 to 0.040%, als: 0.012-0.018%, and the balance of Fe.
2. The method for reducing the processing cracks of the wheel rim steel produced by the sheet billet continuous casting and rolling process according to claim 1, wherein the chemical components in the steel plate smelting process are calculated according to the mass percent, and C:0.04 to 0.06 percent, mn:1.00 to 1.10 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.008 percent, ti:0.010 to 0.020%, als: 0.012-0.018%, and the balance of Fe.
3. Method for reducing the processing cracks of wheel rim steel produced by a sheet billet continuous casting and rolling process according to claim 1, characterized in that the chemical components in the steel plate smelting process are calculated in mass percent for 440CL wheel rim steel, C:0.04 to 0.06 percent, mn:1.20 to 1.30 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.008 percent, ti:0.015 to 0.025 percent, als: 0.012-0.018%, and the balance of Fe.
4. Method for reducing the processing cracks of wheel rim steel produced by a sheet billet continuous casting and rolling process according to claim 1, characterized in that the chemical components in the steel plate smelting process are calculated according to mass percent, for 540CL wheel rim steel, C:0.04 to 0.06 percent, mn:1.50 to 1.60 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.008 percent, ti:0.030 to 0.040 percent, als: 0.012-0.018%, and the balance of Fe.
5. The method for reducing cracks in wheel rim steel production by a sheet billet continuous casting and rolling process according to claim 1, 2, 3 or 4, wherein the CaO content of converter slag is increased in the smelting process, the slag alkalinity is controlled between 3.0 and 3.5, and the P content in the steel is lower than 0.015%.
6. The method for reducing the processing cracks of the wheel rim steel produced by the sheet billet continuous casting and rolling process according to claim 1, 2, 3 or 4, which is characterized in that the lime addition amount is more than or equal to 2500kg in the LF furnace refining process, the ton steel addition amount is more than or equal to 17.24kg/t, and the ton steel addition amount is calculated according to 145-155 t of 120t converter tapping amount; controlling the alkalinity of refining slag to be between 4.0 and 6.0, and controlling the S content in steel to be lower than 0.008 percent.
7. The method for reducing cracks in wheel rim steel production by sheet billet continuous casting and rolling process according to claim 1, 2, 3 or 4, wherein the final rolling temperature is controlled between 825 and 855 ℃, the curling temperature is controlled between 565 and 595 ℃, the steel plate width tolerance is controlled between +10 and 15mm, and the steel plate thickness tolerance is controlled between-0.05 and +0.1 mm.
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| KR20030023995A (en) * | 2001-09-14 | 2003-03-26 | 현대자동차주식회사 | A Steel panel having ultra-high strength and Method for preparing the same |
| CN101219434A (en) * | 2008-01-25 | 2008-07-16 | 广州珠江钢铁有限责任公司 | Method for producing steel for automobile wheel based on bar strip continuous casting and rolling flow path |
| CN102787273A (en) * | 2012-08-21 | 2012-11-21 | 武汉钢铁(集团)公司 | Sheet-billet produced hot-rolled pickled steel with thickness of 1.8mm or lower for automobile and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030023995A (en) * | 2001-09-14 | 2003-03-26 | 현대자동차주식회사 | A Steel panel having ultra-high strength and Method for preparing the same |
| CN101219434A (en) * | 2008-01-25 | 2008-07-16 | 广州珠江钢铁有限责任公司 | Method for producing steel for automobile wheel based on bar strip continuous casting and rolling flow path |
| CN102787273A (en) * | 2012-08-21 | 2012-11-21 | 武汉钢铁(集团)公司 | Sheet-billet produced hot-rolled pickled steel with thickness of 1.8mm or lower for automobile and production method thereof |
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