专利名称：Manufacturing method of seamless steel
pipe for mechanical structural parts
发明人：Makoto Samamoto,Katsunori Nagao申请号：US11393801申请日：20060331
公开号：US20060219333A1公开日：20061005
摘要：The present invention provides a manufacturing method of seamless steel pipefor mechanical structural parts. According to this manufacturing method, productionprocess is simplified and production cost is reduced by employing inline quenching, andsimultaneously, the toughness of steel pipe is guaranteed by controlling Ti/N to be 3.5or lower. A manufacturing method of seamless steel pipe, in which steel having thechemical composition: by weight percent, 0.10 to 0.25% of C, not greater than 1.00% of Si,0.20 to 2.00% of Mn, not greater than 0.03% of P, not greater than 0.020% of S, 0.10 to1.5% of Cr, not greater than 0.5% of Mo, 0.005 to 0.030% of Ti, 0.01 to 0.10% of V, andthe balance being Fe and incidental impurities, and Ti/N being 3.5 or lower, is subjected tofinish rolling at temperature of 900° C. or higher and the section-decrease rate of 40% orgreater; then subjected to soaking directly at temperature of 900 to 1000° C. withoutcooling, and then quenching and tempering.
申请人：Makoto Samamoto,Katsunori Nagao
地址：Naga-Gun JP,Wakayama-Shi JP
国籍：JP,JP
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