Cold-rolled martensite steel plate with yield strength of 750 MPa grade and manufacturing method thereof

Abstract

The invention relates to a cold-rolled martensite steel plate with yield strength of 750 MPa grade and a manufacturing method thereof, and mainly aims to solve the technical problem that the existingcold-rolled martensite steel plate with yield strength of 750 MPa grade is high in manufacturing cost. The cold-rolled martensite steel plate provided by the invention consists of the following chemical components in percentage by weight: 0.12-0.22% of C, 0.30-0.90% of Si, 1.30-1.90% of Mn, 0.20-0.80% of Cr, 0.010-0.050% of Ti, 0.020-0.060% of Al, less than or equal to 0.015% of P, less than or equal to 0.008% of S, less than or equal to 0.006% of N, 0.0015-0.004% of Ca and the balance of iron and inevitable impurities. The steel plate has yield strength of 790-830 MPa, tensile strength greater than 980 MPa, and percentage elongation after fracture A80 greater than or equal to 6%. The cold-rolled martensite steel plate is mainly used for manufacturing a truck boundary beam, a square tube stand column and the like.

Description

technical field [0001] The invention relates to cold-rolled high-strength steel, in particular to a cold-rolled martensitic steel plate with a yield strength of 750 MPa and a manufacturing method thereof, belonging to the technical field of iron-based alloys. Background technique [0002] With the rapid development of the global automobile industry, energy saving, environmental protection, and safety have become the leading trends in future research and development. A series of experiments have shown that the energy consumption of automobiles has a linear relationship with its own weight. For ordinary passenger cars, if the weight is reduced by 10%. , fuel consumption can be reduced by 8%, and emissions can be reduced by 4%. Obviously, light weight is of great significance to the energy saving and emission reduction of automobiles. In addition, people tend to increase driving safety requirements, forcing the automotive industry to use a large number of high-strength plates. ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a cold-rolled martensitic steel plate with a yield strength of 750MPa and its manufacturing method, which mainly solves the technical problem of high manufacturing cost of the existing cold-rolled martensitic steel plate with a yield strength of 750MPa. The continuous annealing unit produces cold-rolled martensitic steel plates with a yield strength of 750MPa

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