| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel for machine structural use which is usable instead of Pb (lead) free-machining steel, has no adverse effect on environment, and can be stably machined. SOLUTION: The steel for machine structural use having excellent machinability contains, by mass%, 0.10 to 0.60% C, 0.05 to 1.0% Si, 0.3 to 2.0% Mn, 0.02 to 0.25% S, 0.002 to 0.030% Al and 0.0005 to 0.01% Ca, consists of, by mass% ratio, 0.1 to 1.0 Ca/Al, and is composed of the balance Fe and unavoidable impurities. COPYRIGHT: (C)2006,JPO&NCIPI
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