| 摘要 |
PROBLEM TO BE SOLVED: To provide Pb-free free-cutting steel whose tool life is further improved. SOLUTION: The Pb-free free-cutting steel comprises, by mass, 0.1-0.7% C, 0.01-2.5% Si, 0.1-3% Mn, 0.01-0.2% S, 0.0002-0.02% Ca and 0.0002-0.01% Mg and contains sulfide inclusions of≥200 pieces per 100 mm<SP>2</SP>, wherein each sulfide inclusion has an area of≥20μm<SP>2</SP>and a total content of Mg and Ca of≥3 mass%. COPYRIGHT: (C)2005,JPO&NCIPI
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