Since hot rolled steel sheets for automobile suspension and chassis parts are frequently formed by burring, materials for these applications must possess hole expansionability as well as high strength. This paper introduces two high performance high strength steel sheets which are suitable for realizing weight reduction and securing crashworthiness in the automobile body, particularly in parts that are important for safety, such as suspension and chassis parts: 1) 'NANOHITEN' is a type of precipitation-hardened steel with a soft ferrite single phase matrix and ultra-fine carbides of single nanometer size which successfully satisfies both strength and hole expansionability requirements. 2) 'BHT steel' achieves a very large increase in tensile strength in baking treatment utilizing the strain aging effect of N, which has a high solubility limit. As a result, strength after forming is on virtually the same level as when conventional materials with higher strength levels are used. In addition to the properties obtained, these two high strength steel sheets are also extremely original in terms of the sheet microstructure, the means of achieving the microstructure, and the metallurgical principles involved. Expanded application is expected in the future. (English translation from JFE Giho, No 16 (2007), P. 28-33 (jap.)).
Hot rolled high strength steels for suspension and chassis parts "NANOHITEN" and "BHT Steel"
Warmgewalzte hochfeste Stähle für Radaufhängung und Fahrwerksteile - 'NANOHITEN' und 'BHT Steel'
JFE Technical Report ; 10 ; 19-25
2007
7 Seiten, 12 Bilder, 3 Tabellen, 12 Quellen
Article (Journal)
English
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