| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel sheet which has excellent deep drawability, to provide a steel tube which has excellent workability, and to provide their production methods. SOLUTION: The high strength cold rolled steel sheet having excellent deep drawability has a composition comprising, by mass, 0.025 to 0.25% C, 0.001 to 3.0% Si, 0.01 to 3.0% Mn, 0.001 to 0.15% P,≤0.05% S, 0.0005 to 0.010% N, <0.008% Al and 0.0005 to 0.010% B, and the balance iron with inevitable impurities, has a metallic structure comprising one or more kinds selected from bainite, austenite, martensite and pearlite by a volume ratio of≥2%, and has a mean r value of≥1.1. COPYRIGHT: (C)2004,JPO&NCIPI
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