1000mpa grade hot-rolled trip steel based on csp process and its manufacturing method

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...

AI Technical Summary

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.

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