780 N/mm2 grade hot-rolled high-strength steel sheet for automotive suspension system

✍ Scribed by Takahiro Kashima; Shunichi Hashimoto; Youichi Mukai

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 659 KB
• Volume: 24
• Category: Article
• ISSN: 0389-4304
• DOI: 10.1016/s0389-4304(02)00248-5

✦ Synopsis

590 N/mm 2 -grade high-strength hot-rolled steel sheet has been applied to an automotive suspension system, and 780 N/mm 2grade has recently been applied on trial to the same parts. Both of the steels used for the suspension system are required to have good formability, especially high stretch-flangeability. This paper describes the effect of the microstructure of the steel on stretchflangeability. The results of mill trials have shown that the bainitic-ferrite mono-phase microstructure has the best mechanical properties.