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1,000 MPa level hot-rolled TRIP steel based on CSP process and manufacturing method

A manufacturing method and process technology, applied in 1000MPa grade hot-rolled TRIP steel and its manufacturing field, can solve the problems of precipitation of micro-alloy elements and control difficulty of phase proportion, etc., and achieve good strong plasticity effect

Active Publication Date: 2018-01-09
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thin slab continuous casting and rolling process has unique physical and metallurgical laws, and it is difficult to take into account the precipitation of microalloying elements and the control of the phase ratio.

Method used

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  • 1,000 MPa level hot-rolled TRIP steel based on CSP process and manufacturing method
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  • 1,000 MPa level hot-rolled TRIP steel based on CSP process and manufacturing method

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Embodiment Construction

[0057] The present invention will be further described in detail below in conjunction with the examples to facilitate a clearer understanding of the present invention, but they do not limit the present invention.

[0058] The hot-rolled TRIP steel of the present invention is produced by a converter-thin slab continuous casting and rolling CSP process, and the specific steps include converter smelting, refining, thin slab continuous casting, continuous casting slab soaking, high-pressure water descaling, controlled rolling, controlled cooling, coiled.

[0059] The steel is smelted using the converter steelmaking-LF-RH process, and the deep desulfurization pretreatment of molten steel is used in the converter steelmaking to ensure a low S content in the steel. The calcium and magnesium deoxidizer is used for deoxidation to reduce the oxygen and Aluminum, and improve the shape, size and distribution of inclusions. After the RH vacuum treatment, molten steel having chemical compo...

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Abstract

The invention discloses 1,000 MPa level hot-rolled TRIP steel based on the CSP process. The 1,000 MPa level hot-rolled TRIP steel comprises chemical elements and components including, by weight percent, 0.16%-0.20% of carbon, 1.60%-1.80% of silicon, 1.50%-1.60% of manganese, 0.20%-0.24% of vanadium, smaller than or equal to 0.008% of phosphorus, smaller than or equal to 0.005% of sulfur, 0.015%-0.060% of acid soluble aluminum, 0.015%-0.025% of nitrogen and the balance iron and inevitable impurities. The steel manufacturing method comprises converter smelting, refining, sheet billet continuouscasting, continuous casting blank uniform heating, high-pressure water descaling, controlled rolling, controlled cooling and coiling. Through the V-N adding microalloying component design, a ferrite phase and a bainite phase are strengthened, meanwhile, carbon concentration is not reduced, stability of retained austenite is maintained, and good strength and plasticity matching is achieved.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled iron and steel strip production, and in particular relates to a 1000MPa hot-rolled TRIP steel based on a CSP process and a manufacturing method. Background technique [0002] With the improvement of people's requirements for the environment, energy, safety, etc., automobiles are developing in the direction of lightweight, high strength, and low cost. The adoption of AHSS (Advanced high-strength steels) is what the automobile and steel industry needs to respond to this trend. The main measures taken together. In AHSS, TRIP steel (transformation-induced plasticity steel) has attracted much attention because of its high matching of strength and elongation, and good comprehensive performance. TRIP steel is mainly used to make car baffles, car door guards, bumpers, chassis components, wheel rims and door impact beams. In Japan, TRIP steel plates have been used to make about 80 parts on the chassis...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/02C22C38/04C22C38/06B21C37/02C21D8/02C21D11/00
Inventor 刘洋毛新平汪水泽徐进桥甘晓龙孙宜强蔡珍刘志勇
Owner 武汉钢铁有限公司
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