Free cutting steel
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United States of America Patent
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Feb 28, 2012
Grant Date -
Dec 23, 2004
app pub date -
Nov 29, 2002
filing date -
Nov 30, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A low carbon free cutting steel can be obtained by allowing the steel to contain 0.02 to 0.15 mass % of C, 0.05 to 1.8 mass % of Mn, 0.20 to 0.49 mass % of S, more than 0.01 mass % and not more than 0.03 mass % of O, 0.3 to 2.3% of Cr, and the balance consisting of Fe and inevitable impurities, the Cr/S ratio falling within a range of between 2 and 6.
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