High tensile steel and process for producing the same
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United States of America Patent
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Oct 4, 1983
Issued Date -
N/A
app pub date -
Jun 9, 1982
filing date -
Jun 29, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high tensile steel which has a satisfactory yield strength of 60 kg/mm.sup.2 or more and excellent resistances to sulfide corrosive cracking and corrosion, and which comprises, as indispensable components, 0.05 to 0.50 wt % of C, 0.1 to 1.0 wt % of Si, 0.1 to 2.0 wt % of Mn, 0.05 to 1.50 wt % of Co and the balance consisting of Fe, is produced by hot-or cold-rolling it, rapidly heating the rolled steel to austenitize it, quenching the austenitized steel and, finally, tempering the quenched steel at a temperature not higher than the Ac.sub.1 point of the steel.
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