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KAWASAKI STEEL TECHNICAL REPORT
No.19 ( November 1988 )
Steel Pipe
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Characteristics of Stainless Steel for Automotive Exhaust Systems and Its Production by Tandem Cold Rolling

Makoto Kobayashi, Tatsuo Kawasaki, Yasuo Mihara, Hirotake Sato, Masakazu Takada, Fumiya Yanagishima
Synopsis:
Ferritic stainless steels for automotive exhaust systems are reexamined for corrosion resistance and properties at elevated temperatures. Production process of the steels using conventional facilities for plain carbon steels in studied. Stainless steels have good corrosion resistance to inner condensate and outer road salt. Ti-stabilized type 409L is better than nonstabilized type 410L in both corrosive environments. Type 409L also has better properties at elevated temperature and better press formability, and is considered to be the optimum material for these automotive applications. It is shown that rolling by the high-productive tandem mill and optimizing the condition of the annealing process can provide stainless steel strips with sufficient quality of dimensions, surfaces, and properties.
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