Wheel steel with tensile strength being at level of 590 MPa and production method

A technology of tensile strength and production method, applied in the field of metallurgy, which can solve the problems of bursting, large-sized oxides and nitrides, cracking, etc.

Inactive Publication Date: 2017-05-10
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Automobile wheel steel has relatively strict requirements on welding performance and elongation. Wheel steel is composed of two parts: rim and spoke. The rim is cut into strips and welded. After welding, it is rolled and formed. After each forming, welding is required. Welding is required in the process And roll forming, poor welding performance will cause bursting, low elongation will form cracks in the process of rolling, affecting the yield of wheel steel
[0004] In the current existing technology, usually low-grade automobile wheel steel is strengthened by carbon-manganese, and higher-grade automobile wheel steel is strengthened by niobium-titanium and vanadium to increase the strength of the wheel steel. However, the increase in carbon equivalent caused by carbon-manganese and vanadium strengthening will reduce the Welding performance of steel, while niobium-titanium composite strengthening leads to high alloy cost, and titanium is easy to generate large-scale oxides and nitrides during the welding process, resulting in high bursting rate and micro-cracking rate, which affects the yield

Method used

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  • Wheel steel with tensile strength being at level of 590 MPa and production method

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Embodiment 1

[0029] A wheel steel with a tensile strength of 590MPa, the chemical composition and weight percentage are: C: 0.05%, Si: 0.1%, Mn: 1.4%, P: 0.015%, S: 0.008%, Nb: 0.04%, O: 0.0025% , N: 0.0040%, Als: 0.015%, the balance is Fe and unavoidable impurities.

[0030] Using 150 tons of converter smelting, LF refining, slab continuous casting, heating, high pressure water descaling, controlled rolling (rough rolling→hot coil box→finish rolling), controlled rolling cooling, coiling production process,

[0031] The micro-positive pressure in the LF refining process ensures deoxidation and desulfurization, outbound [O]: 20ppm, [N]: 30ppm; the slab continuous casting process performs large and medium ladle protection to prevent inhalation oxidation, product requirements [O]: 25ppm, [ N]: 40ppm.

[0032] Qualified slabs are heated to 1300°C, the exit temperature of the 5th pass of rough rolling is 1140°C, the exit temperature of the 7th pass of finish rolling is 890°C after passing thro...

Embodiment 2

[0034] A wheel steel with a tensile strength of 590MPa, the chemical composition and weight percentage are: C: 0.06%, Si: 0.08%, Mn: 1.5%, P: 0.013%, S: 0.006%, Nb: 0.045%, O: 0.0023% , N: 0.0038%, Als: 0.019%, the balance is Fe and unavoidable impurities.

[0035] It adopts 150-ton converter smelting, LF refining, slab continuous casting, heating, high-pressure water descaling, controlled rolling (rough rolling→finish rolling), controlled rolling cooling, and coiling production processes.

[0036] The micro-positive pressure in the LF refining process ensures deoxidation and desulfurization, outbound [O]: 18ppm, [N]: 33ppm; the slab continuous casting process performs large and medium ladle protection to prevent inhalation oxidation, product requirements [O]: 23ppm, [ N]: 38ppm.

[0037] The qualified slab is heated to 1250°C, the exit temperature of the 5th pass of rough rolling is 1090°C, the exit temperature of the 7th pass of finish rolling is 870°C, after cooling at 28°...

Embodiment 3

[0039] A wheel steel with a tensile strength of 590MPa, the chemical composition and weight percentage are: C: 0.07%, Si: 0.07%, Mn: 1.6%, P: 0.012%, S: 0.005%, Nb: 0.050%, O: 0.0022% , N: 0.0037%, Als: 0.023%, the balance is Fe and unavoidable impurities.

[0040] It adopts 150-ton converter smelting, LF refining, slab continuous casting, heating, high-pressure water descaling, controlled rolling (rough rolling→hot coil box→finish rolling), controlled rolling cooling, and coiling production processes.

[0041] The micro-positive pressure in the LF refining process ensures deoxidation and desulfurization, outbound [O]: 10ppm, [N]: 35ppm; the slab continuous casting process performs large and medium ladle protection to prevent inhalation oxidation, product requirements [O]: 22ppm, [ N]: 37ppm.

[0042] The qualified slab is heated to 1280°C, the exit temperature of the 5th pass of rough rolling is 1110°C, the exit temperature of the 7th pass of finish rolling is 850°C, after c...

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Abstract

The invention discloses wheel steel with the tensile strength being at level of 590 MPa and a production method. The wheel steel with the tensile strength being at level of 590 MPa comprises, by weight, 0.05%-0.09% of C, no more than 0.1% of Si, 1.4%-1.7% of Mn, no more than 0.015% of P, no more than 0.008% of S, 0.04%-0.055% of Nb, no more than 0.0025% of O, no more than 0.0040% of N, 0.015%-0.045% of Als, and the balance Fe and inevitable impurities. The production method comprises the following steps of converter smelting, LF refining, continuous casting of a slab, heating of the slab, descaling with high-pressure water, controlled rolling, cooling for controlled rolling, and curling. A hot-rolled curled plate produced through the method is reinforced through Nb, the C content is decreased, the welding performance and forming performance of the wheel steel are improved, and industrial production is achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a wheel steel with a tensile strength of 590MPa and a production method thereof. Background technique [0002] Automobile wheels carry the weight of the entire vehicle and have very strict requirements on quality. With the rapid development of the current automobile industry, the requirements for lightweight automobiles are constantly improving. The strength level of wheel steel is constantly increasing from 380MPa, 420MPa, and 480MPa. Improvement, while the strength level is increased, the welding performance and formability of the wheel steel cannot be reduced, which puts forward higher requirements for high-strength automobile wheel steel. [0003] Automobile wheel steel has relatively strict requirements on welding performance and elongation. Wheel steel is composed of two parts: rim and spoke. The rim is cut into strips and welded. After welding, it is rolled ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/04C22C38/02C22C38/06C21D8/02
CPCC22C38/12C21D8/0226C22C38/001C22C38/02C22C38/04C22C38/06
Inventor 刘伟梁静召田鹏高海王倩乔俊
Owner HEBEI IRON AND STEEL
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