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自動車排気部品用ステンレス鋼の特性とタンデム圧延による製造

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.20 (1988) No.1

自動車排気部品用ステンレス鋼の特性とタンデム圧延による製造

Characteristics of Stainless Steel for Automotive Exhaust System and Its Production by Tandem Cold Rolling Mill

小 林 眞(Makoto Kobayashi) 川 崎 龍 夫 (Tatsuo Kawasaki) 三 原 康 雄 (Yasuo Mihara) 佐藤 広武(Hirotake Sato) 高田 正和(Masakazu Takada) 栁島 章也 (Fumiya Yanagishima) 要旨 : 自動車排気系部品用ステンレス鋼について,最適鋼種を耐食性および高温特性の点から検 討した。また,普通鋼冷延設備を用いた製造に関わる問題点について検討した。R410L お よびR409L ステンレス鋼は内面側の排気凝縮水,外面側の塩水の両方に対して優れた耐食 性を示した。両者で比較すると,Ti を添加した R409L が無添加の R410L よりも優れた成 績を示した。また,R409L は高温特性および成形性にも優れ,この種の用途に最も適した 材料である。高い生産性を有するタンデムミルによる圧延と,焼鈍工程に関して検討を行 い普通鋼冷延設備を用いても,板厚精度,表面疵および材質の点で十分な品質のものが製 造できることを示した。 Synopsis :

Ferritic stainless steels for automotive exhaunt systems are reexamined for corrosion resistance and properties at elevated temperatures. Production process of the steels using conventional facilities for plain carbon steels is also studied. Stainless steels have good resistance against corrosion by 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.

(c)JFE Steel Corporation, 2003

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