| 摘要 |
A method of manufacturing a 13Cr steel pipe which satisfies a hardness (HRC) of at most 22 with 13Cr grade L80 of American Petroleum Institute (API) standards, which is an indicator of a high strength, high yield ratio, and good corrosion resistance, is provided. A steel billet having a chemical composition comprising, in mass percent, C: 0.15 - 0.21%, Si: 0.16 - 1.0%, Mn: 0.35 - 1.0%, Cr: 10.5 - 14.0%, P: at most 0.020%, S: at most 0.0050%, Al: 0.025 - 0.050%, and a remainder of Fe and impurities is subjected to hot working with a finishing temperature of 800 - 960° C to form a mother pipe, which is immediately quenched at a cooling rate of at least air cooling and then tempered by heating. |
