Steel plate and production method thereof

Abstract

The invention relates to a steel plate which comprises the following chemical components in percentage by mass: 0.08%-0.15% of C, 0.1%-0.6% of Si, 1.9%-3.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.015%-0.065% of Als, 0.01%-0.05% of Ti, 0.02%-0.05% of Nb, 0.3%-0.7% of Cr and the balance of Fe and inevitable impurities. The production method of the steel plate comprises the production steps of hot rolling, acid rolling and continuous annealing, in the acid rolling process, a rolling mill is a CVC five-rack six-roller continuous rolling mill, racks F1-F3 adopt working rollers with the convexity of 75 microns, a rack F4 adopts working rollers with the convexity of 80-90 microns, and a rack F5 adopts working rollers with the convexity of 90-100 microns. The work hardening index of the finished steel plate is greater than or equal to 0.2, and the thickness difference of the same plate is within + / -3%.

Description

technical field [0001] The invention belongs to the technical field of steel plate rolling, and particularly relates to a steel plate and a production method thereof. Background technique [0002] With the continuous development of automobile lightweight, the application proportion of advanced high-strength steel in automobiles continues to increase. Gepa-grade cold-rolled sheet has high strength and good weldability, which can not only reduce the quality of the car body, but also improve the bearing capacity of the car body. Generally, high-strength steel is mainly used for the processing and manufacturing of simple automobile structural parts, and the dimensional accuracy requirements are relatively low. However, in recent years, with the deepening of the lightweight of automobiles, some high-precision key structural parts of automobiles have also begun to be replaced by cold-rolled high-strength steel, which puts forward high-precision requirements for high-strength stee...

AI Technical Summary

Problems solved by technology

[0004] A single-stand rolling mill is used for high-strength steel rolling. The roll diameter of the single-stand rolling mill is small, and the rigidity of the rolling mill is relatively high, which can alleviate the problem of excessive thickness at the head and tail. However, its production efficiency is low and the cutting loss at the head and tail is large, which seriously affects the production rhythm. and Yield

[0005] At present, there is no method suitable for rolling Gipa grade high-precision cold-rolled steel sheets in CVC continuous rolling mills

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