| 摘要 |
PROBLEM TO BE SOLVED: To obtain free-cutting steel which has an excellent service life in cutting, and to improve efficiency in cutting. SOLUTION: The free-cutting steel contains, by mass, 0.001 to 0.040% S, 0.04 to 0.20% Al, 0.0080 to 0.0250% N, and satisfying Al/N: 2.0 to 15.0, and containing no free-cutting elements. COPYRIGHT: (C)2003,JPO
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