JFE Steel has developed and commercialized from TS780 to TS1470 MPa grade cold-rolled ultra high-strength steel sheets with excellent press-formability, spot-weldability, and stability of mechanical properties and dramatically improve crashworthiness and fuel economy when applied in automobile bodies/ reinforcement parts and seat frame parts. in response to strict formability requirements, the company conducted basic and detailed studies of changes in the microstruc-ture and propagation of microscopic cracks during forming, and realized remarkable improvements in elonga-tion and stretch-flange formability in comparison with conventional steels by adopting a low carbon equivalent design. In particular, as expanded application of TS980 MPa grade steel sheets is expected in the future, JFE Steel has developed a lineup of three types of TS980 MPa grade steels with different balances of mechanical properties corresponding to the material application and joining method. These products have already earned an excellent reputation with users. This paper introduces two newly developed TS980 MPa grade cold rolled steel sheets, one with excellent stretch-flange formability and the other for mechanical joining. Surface cracking in mechanical joining, which is strongly related to local elongation, has been suppressed by acheving a single martensite phase. (Engl. translation from JFE GIHO, 2004, No.4, p.33-38, (jap.))


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Ultra high-strength steel sheets for bodies, reinforcement parts, and seat frame parts of automobile - Ultra high-strength steel sheets leading to great improvement in crashworthiness


    Additional title:

    Ultrahochfestes Stahlblech für Karosserien, für armierte Bauteile und für Sitzrahmenteile im Kraftfahrzeug - ultrahochfestes Stahlblech führt zur Verbesserung des Aufprallwiderstandes


    Contributors:

    Published in:

    Publication date :

    2004


    Size :

    6 Seiten, 3 Bilder, 2 Tabellen, 13 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Crashworthiness of Automotive Stamped Parts Using High Strength Steel Sheets

    Yoshitake, A. / Zeng, D. / Sato, K. et al. | SAE Technical Papers | 2002


    Crashworthiness of automotive stamped parts using high strength steel sheets

    Sato,K. / Yoshitake,A. / Zang,D. et al. | Automotive engineering | 2002



    A Study on Improving Crashworthiness of Automotive Parts by using High Strength Steel Sheets

    Yoshitake, Akihide / Sato, Kentaro / Hosoya, Yoshihiro | SAE Technical Papers | 1998


    A study on improving crashworthiness of automotive parts by using high strength steel sheets

    Yoshitake,A. / Sato,K. / Hosoya,Y. et al. | Automotive engineering | 1998