| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for inexpensively producing an automotive exhaust system steel pipe excellent in oxidation resistance. SOLUTION: In a method for producing an automotive exhaust system steel pipe in which a steel pipe containing, by mass, <=0.015% C, <=0.015% N, 1 to 10% Cr, 0.5 to 5% Al, <=3% Si and <=3% Mn is heated at 800 to 1200 deg.C and is thereafter cooled to <=400 deg.C within 300 sec, by this invention, an automotive exhaust system steel pipe low in the content of Cr as a componential element and furthermore low in a process cost because of the elimination of cold annealing and excellent in oxidation resistance compared to the case of the conventional automotive exhaust system ferritic stainless steel pipe can be provided.
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