Process for producing cast steel billet or steel ingot of titanium-added case hardening steel
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United States of America Patent
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Issued Date -
Feb 14, 2008
app pub date -
Apr 25, 2007
filing date -
Apr 23, 2006
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Abandoned
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Abstract
Disclosed is a production process that can suppress the formation of large-diameter TiN or N-rich TiCN inclusions which adversely affect machinability and consequently can produce a cast steel billet or steel ingot or a steel material of a Ti-added case hardening steel having excellent machinability. The production process comprises the step of casting a steel comprising by weight carbon (C): 0.10 to 0.30%, titanium (Ti): 0.05 to 0.20%, and nitrogen (N): not more than 0.0100% into a round cast steel billet or steel ingot having a diameter of not more than 23 cm or, in the alternative, a rectangular cast steel billet or steel ingot having a short side length of not more than 23 cm.
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