Process technology and steel development in press hardening

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• 作者：Bian JianHardy MohrbacherWANG Li
• 会议时间：2013-06-01
• 关键词：press hardening steel ; martensite ; grain refinement ; grain boundary cohesion ; toughness ; delayed cracking
• 作者单位：Bian Jian(Niobium Tech Asia,068898 Singapore)Hardy Mohrbacher(NiobelCon bvba,2970 Schilde,Belgium)WANG Li(Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China)
• 母体文献：第五届宝钢学术年会论文集
• 会议名称：第五届宝钢学术年会
• 会议地点：上海
• 主办单位：中国金属学会
• 语种：chi

摘要

Over the last decade press hardening process has become a key lightweight technology for the automotive industry worldwide because it offers ultra - high strength up to 1 500 MPa for the safety components;adopts the modern manufacturing technology to form the ultra - high steels and finally gives carmakers new opportunities to achieve the lightweight design.Today to use press hardening steel up to 26% in the car body is the state of art and it could reach 40% in the future.However the alloying concept of the standard press hardening steel 22MnB5 was not originally designed for automotive application.Due to the martensitic microstructure and the high strength level the crash performance of press hardening steel is highly dependent on its toughness,bendability ( 3 - point - bending test) and resistance to delayed hydrogen induced cracking.Based on this consideration the potential problems of the conventional alloying concept will be discussed and some latest research results,which are related to the improvement of press hardening steels for a better crash performance,will be presented.Finally this paper will introduce the novel alloying designs for high strength steels which are tailored for press hardening process and suitable for automotive application.The key of the new alloying concept is to adopt Nb microalloying and to remove boron from the concept.