Lead-free steel for machine structural use with excellent machinability and low strength anisotropy
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United States of America Patent
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Nov 4, 2008
Grant Date -
Mar 17, 2005
app pub date -
Aug 6, 2004
filing date -
Feb 10, 2000
priority date (Note) -
Expired
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Abstract
A lead-free steel for machine structural use with excellent machinability and low strength an isotropy, which does not contain Pb and is equal to or higher than a conventional D Pb-containing free cutting steel in properties, is provided. This steel includes, on the weight basis, C: 0.10 to 0.65%; Si: 0.03 to 1.00%; Mn: 0.30 to 2.50%; S: 0.03 to 0.35%; Cr: 0.1 to 2.0%; Al: less than 0.010%; Ca: 0.0005 to 0.020%; Mg: 0.0003 to 0.020%; 0: less than 20 ppm; and the balance being Fe and inevitable impurities.
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