JFE Steel has newly developed two kinds of steel tubes having excellent fatigue endurance for automotive suspension parts. The tube employed to torsion beam has an excellent combination of fatigue endurance, hydro-formability and delayed fracture resistance. These properties can be obtained by the low C (less than 0.3%) based chemistry and the high precision controlled rolling and cooling technique in hot rolling. Further developed steel tube for stabilizer exhibits also excellent fatigue endurance induced from its high r-value (more than 1.5) property. This excellent crystallographic characteristics can be obtained by the warm reducing in the 'HISTORY' process and contribute to improve the fatigue life by suppressing the wall thickness reduction during bending applications. Moreover, JFE Steel has been promoting the application of steel tube to automotive suspension parts, with not only newly developed steel tubes mentioned above, but also with the analysis of the formability of high strength tube in rotary draw bending process and the development of the related new rotary bending method without both mandrel and wiper. (Engl. translation from JFE Giho No.9 (Aug 2005), P.30-35 (jap.))
High performance steel tube for automotive parts
Hochwertige Stahlrohre für Fahrzeugbauteile
JFE Technical Report ; 7 ; 33-39
2006
7 Seiten, 12 Bilder, 4 Tabellen, 22 Quellen
Aufsatz (Zeitschrift)
Englisch
Fahrzeugbauteil , Mikrostruktur , Stahlrohr , Rohrherstellung , technische Entwicklung , Trend (Entwicklung) , Anwendung im Fahrzeugbau , thermomechanische Behandlung , Ermüdungslebensdauer , Drehungsermüdungsverhalten , Kerbschlagzähigkeit , Wasserstoffversprödung , hochfester niedrig legierter Stahl , Kaltumformbarkeit
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