Boron containing steel plate for heat treatment and manufacturing method thereof

Abstract

A boron containing steel plate for heat treatment and a manufacturing method thereof. The steel plate comprises 0.15-0.4wt% of C, 0.20-0.60 wt% of Si, 1.00-2.00wt% of Mn, P no more than 0.030wt%, S no more than 0.015wt%, N no more than 0.008wt%, 0.0005-0.005wt% of B, 0.02-0.06wt% of Al, 0.1-0.5wt% of Cr, and 0.01-0.08wt% of Ti, wherein an atomic ratio of Ti to N is 1-50, and others are Fe and inevitable impurities. According to the invention, a contradiction between that steel plate is not easy to be shaped complexly and that a final component intensity is required to be higher than 1000Mpa can be solved. A routine manufacturing process is employed in the invention to produce the steel plate, so that a set does not need to be reconstructed or upgraded, and production costs are low. The steel plate of the invention can be used for manufacturing automobile safety components such as reinforcement rod in vehicle door, back and forth bumpers, and A/B column reinforcements.

Description

technical field [0001] The invention relates to steel for automobiles, in particular to a steel plate for heat treatment containing boron and a manufacturing method thereof. The tensile strength of the steel plate is above 1000 MPa, and it is used as a safety reinforcement for automobiles, such as an anti-collision bar in a car door or an A / B pillar reinforcement, etc. . Background technique [0002] In order to improve the collision safety performance of automobiles, especially the side collision and frontal collision performance, it is a development trend of steel sheets for vehicles to increase the strength of steel plates and reduce the thickness of steel plates in recent years. [0003] At present, there are two ways to obtain high-strength parts. One is to directly use ultra-high-strength steel plates with a tensile strength greater than 1000MPa, which are manufactured by stamping or rolling forming, but more complex parts cannot be manufactured; the other is to use te...

AI Technical Summary

Problems solved by technology

[0004] The first method is the current mainstream idea, but the production of steel plates with a tensile strength greater than 1000MPa requires a special production unit, which requires a large investment, and the subsequent processing and forming requires high equipment requirements, such as cold stamping machines with large tonnage and edge trimming. The tool requirements are high and difficult

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