PRODUCTION METHOD FOR SEAMLESS STEEL PIPE USED IN LINE PIPE, AND SEAMLESS STEEL PIPE USED IN LINE PIPE

WIPO Patent Application WO/2011/093117

A1

Disclosed is a production method for seamless steel pipes used in line pipes, whereby the toughness of seamless steel pipes used in line pipes can be improved. A round billet having a chemical composition that includes, in mass%, 0.02 to 0.15% C, no more than 0.5% Si, and 0.5 to 2.5% Mn, with the remainder comprising Fe and impurities, is heated (S1). Rotary piercing is performed on the heated round billet to produce a blank tube (S2). The blank tube is rolled and the diameter thereof is fixed, thereby producing a seamless steel pipe (S3). The seamless steel pipe is cooled with water, and water cooling is halted when the temperature of the seamless steel pipe reaches 450°C or lower (S5). The cooled seamless steel pipe is quenched (S6). The quenched seamless steel pipe is tempered (S7).

HITOSHIO, Keisuke (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
一入　啓介 (〒41 大阪府大阪市中央区北浜４丁目５番３３号　住友金属工業株式会社内 Osaka, 〒5410041, JP)
KONDO, Kunio (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)

JP2011/050174

August 04, 2011

January 07, 2011

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SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 Osaka, 〒5410041, JP)
HITOSHIO, Keisuke (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
一入　啓介 (〒41 大阪府大阪市中央区北浜４丁目５番３３号　住友金属工業株式会社内 Osaka, 〒5410041, JP)

C21D8/10; B21B23/00; C21D9/08; C22C38/00; C22C38/04; C22C38/58

UEBA Hidetoshi et al. (Intelix International, Aqua Dojima West4-16, Dojimahama 1-chome,Kita-ku, Osaka-shi, Osaka 04, 〒5300004, JP)

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