High formability heat-resistance ferritic stainless steel and pipes for automotive exhaust system parts were developed to reduce auto weight and meet stricter emission requirements by making full use of the advanced production facilities recently constructed at Chiba Works. The average r-value of the newly developed stainless steel was improved by more than 1.3 times in comparison with the conventional steel while retaining the same level of heat resistance. This increase in the r-value lead to a remarkable improvement in various forming properties which are important for automotive exhaust system parts, including 1) limit drawing ratio, 2) stretch flanging ratio, 3) limit expansion ratio of pipe, and 4) thickness reduction ration of pipe after bending. In particular, the formability of the newly developed stainless steel pipes was nearly equal to that of conventional stainless steel pipes after stress relief annealing. (Engl. translation from Kawasaki Steel Giho, 33 (2001), Number 2, Pages 72-76 (jap.)) (VDEh)
Ferritic stainless steels and pipes for automotive exhaust systems to meet weight reduction and stricter emission requirements
Ferritische nichtrostende Stähle und Stahlrohre für die Auspuffsysteme von Kraftfahrzeugen zur Erfüllung der Anforderungen hinsichtlich Leichtbau und Emissionsvermeidung
Kawasaki Steel Technical Report ; 46 ; 19-24
2002
6 Seiten, 10 Bilder, 4 Tabellen, 8 Quellen
Article (Journal)
English
ferritischer nichtrostender Stahl , Rohr , Fahrzeugbauteil , Leichtbauweise , Abgasschalldämpfer , Abgasanlage , Abgaskatalysator , Kaltumformbarkeit , Werkstoffwahl , R-Wert , Streckformgeben , Korrosionsbeständigkeit , Zugfestigkeit , Streckgrenze , mechanische Eigenschaft , Schadstoffemission , Tiefziehstahl , IF-Stahl , Auspuffrohr
Advanced stainless steels for stricter regulations of automotive exhaust gas
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