Method for manufacturing an ultra-highstrength steel bar
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United States of America Patent
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Dec 1, 2015
Grant Date -
Apr 25, 2013
app pub date -
Apr 18, 2011
filing date -
Jun 28, 2010
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Abstract
This invention relates to an ultra-high-strength steel bar and to a method of manufacturing the same, in which the steel bar includes C: 0.05 to 0.45 wt %, Si: 0.10 to 0.35 wt %, Mn: 0.1 to 0.85 wt %, Cr: 0.6 to 1.20 wt %, and Mo: 0.05 to 0.35 wt %, with the remainder being Fe, wherein a martensite structure is formed at a surface layer and a fine ferrite structure is formed at a center layer.
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