| 摘要 |
<p>A steel stock consisting, in basic composition, of C ?0.12%, 0.5 - 1.0% Mn, 0.10 - 0.25%Si, p ? 0.015%, S? 0.0020%, Nb ? 0.050%, 0.0010 - 0.0060%Ca and the remainder of Fe and negligible traces of impurities is hot rolled, this hot rolling being finished at a temperature above 870.degree.C. The steel is then rapidly cooled on a runout table at an average cooling rate of from 5.degree.C to 30.degree.C per second, and finally, the steel is coiled at a temperature below 570.degree.C. The steel stock has superior resistance to sour gas.</p> |
