Development of Nb-V microalloyed hot forming steel based on 22MnB5

doi:10.13251/j.issn.0254-6051.2021.01.021

Abstract

Abstract: Based on the common technical problems of insufficient cold bending performance and strong hydrogen embrittlement sensitivity of existing hot forming steel parts,the design idea of Nb and V microalloying was adopted on the basis of 22MnB5 steel,and the microstructure,hardenability and extreme tip cold bending performance of the tested steels were studied.The results show that the microstructure of hot forming steel 22MnB5 before and after microalloying is all martensite,while becomes finer after microalloying;Nb-V microalloying can effectively improve the hardenability of the 22MnB5 hot forming steel,the depth of hardened layer reaches 13-14 mm,and the extreme tip cold bending angle of the tested steels reaches 58°-72°,which further widens the processing window of hot forming forming.Based on the test results of microstructure,hardenability and extreme tip cold bending performance of the tested steels,the comprehensive strength and plasticity of the steel are improved by adding 0.04%Nb and 0.04%V,and meet the requirements of automotive parts with high extreme tip cold bending performance.

Key words: 22MnB5 steel, microalloying, extreme tip cold bending performance

CLC Number:

TG142.45

Liu Gang, Gan Yong, Liu Chong, Ma Mingtu, Wu Jian, Yang Yingdong, Hu Chunlin. Development of Nb-V microalloyed hot forming steel based on 22MnB5[J]. Heat Treatment of Metals, 2021, 46(1): 109-113.

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