| 摘要 |
A hot-rolled shape steel for crude oil tanks which has a composition containing by mass C: 0.001 to 0.16%, Si: 0.01 to 1.5%, Mn: 0.1 to 2.5%, P: 0.025% or below, S: 0.01% or below, Al: 0.005 to 0.1%, N: 0.001 to 0.008%, W: 0.001 to 0.5% and Cr: 0.06 to less than 0.20% with the balance consisting of Fe and unavoidable impurities and a ferrite/pearlite microstructure containing deformed ferrite in an amount of 10% or above in terms of area ratio based on the whole microstructure and which exerts excellent resistance to uniform or local corrosion independent of coating and exhibits a strength corresponding to YP of 315MPa or above; and a process for manufacturing the steel. |
