Hot rolled steel sheet for oil country tubular goods, method for manufacturing the same and steel pipe manufactured using the same
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United States of America Patent
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Jun 30, 2016
app pub date -
Dec 23, 2015
filing date -
Dec 26, 2014
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Abstract
Provided is a hot rolled steel sheet for oil country tubular goods (OCTG). The hot rolled steel sheet for oil country tubular goods (OCTG) according to an aspect of the present invention comprises C: 0.08 to 0.18 wt %, Si: 0.10 to 0.50 wt %, Mn: 1.2 to 2.0 wt %, P: 0.020 wt % or less, S: 0.003 wt % or less, Nb: 0.04 to 0.1 wt %, Cr: 0.05 to 0.5 wt %, Ti: 0.01 to 0.05 wt %, B: 0.0005 to 0.003 wt %, Ca: 0.001 to 0.006 wt %, N: 0.008 wt % or less, a balance of Fe and inevitable impurities, and satisfy Relational Expression 1,
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