Hot stamping molded steel 30MnB5 and production method thereof

Abstract

The invention discloses hot stamping forming steel 30MnB5 and a production method thereof. The hot stamping forming steel 30MnB5 comprises, by mass, 0.27%-0.32% of C, 1.15%-1.45% of Mn, smaller than or equal to 0.010% of S, smaller than or equal to 0.025% of P, smaller than or equal to 0.40% of Si, larger than or equal to 0.010% of Als, 0.020%-0.060% of Ti, 0.0008%-0.0050% of B, 0.25%-0.60% of Cr, smaller than or equal to 0.20% of Ni, smaller than or equal to 0.35% of Mo, smaller than or equal to 0.0060% of N and the balance Fe and inevitable impurities. According to the forming steel, alloy elements are optimized, RE, Nb and V elements do not need to be added, the adding amount of Si and Al is reduced, it is guaranteed that the material has good hardenability, and enough tensile strength can still be obtained after heat treatment; the tensile strength after heat treatment reaches 1.5-1.7 GPa, so that a basis is provided for light weight and high safety performance of automobiles. According to the method, the mechanical property uniformity of the steel strip in the length and width directions is improved, and the phase change swelling amount after coiling is reduced; the obtained steel strip has good performance uniformity, and the yield of later machining is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, in particular to a hot stamping forming steel 30MnB5 and a production method thereof. Background technique [0002] With the continuous improvement of automobile lightweight and safety requirements, steel strips are required for automobile parts: B-pillar, front bumper, front door anti-collision beam, door anti-collision bar, A-pillar reinforcement plate, central channel, threshold, etc. It has sufficient strength after heat treatment. For example, the instability of composition and temperature control caused by the addition of many types and large amounts of alloys, the serious segregation of the continuous casting slab caused by the high content of segregation-prone elements, the poor uniformity of the width and length of hot-rolled coils, and the segregation after coiling. Flat roll and other issues. [0003] Chinese invention patent application CN102286689A discloses a prepa...

AI Technical Summary

Problems solved by technology

However, the product structures in the above documents are austenite and ferrite, and the product strength is low, which is difficult to meet the strength requirements of structural parts for steel

Images