Sheet steel with tensile strength of 1500 MPa levels and used for hot stamping forming and cast steel plate (CSP) production method thereof

Abstract

The invention discloses sheet steel with the tensile strength of 1500 MPa levels and used for hot stamping forming and a cast steel plate (CSP) production method thereof. The sheet steel comprises, by weight, 0.20-0.25% of C, 0.25-0.40% of Si, 1.00-1.30% of Mn, 0-0.025% of P, 0-0.01% of S, 0.015-0.035% of Als, 0-0.005% of N, 0-0.005% of B, 0.020-0.060% of Nb, 0.010-0.040% of Ti, and the balance Fe and inevitable microelements. According to the sheet steel with the tensile strength of 1500 MPa levels and used for hot stamping forming and the cast steel plate (CSP) production method thereof, the process steps comprises molten steel smelting, vertical bending type CSP sheet blank continuous casting, descaling, roller bottom type tunnel furnace soaking, thermal mechanical control processing (TMCP) six machine frame hot continuous rolling, laminar cooling, reeling, unreeling pickling, flattening and reeling; sheet material cold rolling and annealing heat treatment are omitted, and a traditional cold-rolled sheet product is replaced by a hot rolled sheet product; the comprehensive production cost is reduced, and the cost of the steel per ton can be reduced by over 600 yuan.

Description

technical field [0001] The invention belongs to the technical field of steel for ultra-high strength hot forming in the metallurgical industry, and in particular relates to a thin steel plate for hot stamping forming with a tensile strength of 1500 MPa and a CSP production method thereof. Background technique [0002] With the increasing environmental problems, automobile lightweight has become the core issue in today's automobile manufacturing field. The use of high-strength steel for lightweight design of automobile bodies is the best way to meet the needs of automobile lightweight and improve collision safety. However, for ultra-high-strength steel above 1000MPa, iron and steel companies must use specialized ultra-high-strength steel equipment for production; at the same time, automobile companies have technical problems such as difficult control of stamping springback and poor dimensional accuracy. [0003] The birth of hot stamping forming technology has solved the abo...

AI Technical Summary

Problems solved by technology

In the above-mentioned production process, raw materials need to undergo uncoiling and coiling, heating and cooling treatment repeatedly in hot rolling, cold rolling, annealing treatment and other processes. The production cost of repeated processes will inevitably lead to high prices of the final thin steel plate products produced.

Images