| 摘要 |
PROBLEM TO BE SOLVED: To process a ferritic stainless steel sheet so as to have a sectional shape for components and to prevent a crack etc., from occurring even if the ferritic stainless steel sheet is used for applications where strict processing conditions are requested. SOLUTION: The ferritic stainless steel having the tensile strength TS of≤500 MPa, total elongation EL of≥25%, and an average r value of≥1.3 is made into a ferritic stainless steel tube by winding the steel sheet to a tubular form and welding its butt surfaces. The ferritic stainless steel tube is subjected to such bending that the radius of bending at the central axis of the tube is≤1.2 times the diameter of the ferritic stainless steel tube and that the direction of the central axis of the tube at one end of the ferritic stainless steel tube forms an angle of≥160°with the direction of the central axis of the tube at the other end. In addition, the processing is so performed that the ferritic stainless steel tube has the sectional shape for components. COPYRIGHT: (C)2007,JPO&INPIT
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