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HIGH-STRENGTH SEAMLESS STEEL PIPE FOR OIL COUNTRY TUBULAR GOODS AND METHOD OF PRODUCING THE SAME (AS AMENDED)
HIGH-STRENGTH SEAMLESS STEEL PIPE FOR OIL COUNTRY TUBULAR GOODS AND METHOD OF PRODUCING THE SAME (AS AMENDED)
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机译：石油国家管状产品用高强度无缝钢管及其制造方法（经修正）
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摘要
Provided is a high-strength seamless steel pipe having the composition which contains, by mass %, 0.20 to 0.50% C, 0.05 to 0.40% Si, 0.3 to 0.9% Mn, 0.015% or less P, 0.005% or less S, 0.005 to 0.1% Al, 0.008% or less N, 0.6 to 1.7% Cr, 0.4 to 1.0% Mo, 0.01 to 0.30% V, 0.01 to 0.06% Nb, 0.0003 to 0.0030% B, and 0.0030% or less O (oxygen). The high-strength seamless steel pipe has the microstructure where a volume fraction of a tempered martensitic phase is 95% or more, and prior austenitic grains have a grain size number of 8.5 or more, and a segregation degree index Ps which is defined by a formula Ps=8.1 (XSi+XMn+XMo)+1.2XP relating to XM which is a ratio between a segregated portion content and an average content is set to less than 65.
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机译：本发明提供一种高强度无缝钢管，该高强度无缝钢管具有以质量％计含有0.20〜0.50％的C，0.05〜0.40％的Si，0.3〜0.9％的Mn，0.015％以下的P，0.005％以下的S，0.005的组成。到0.1％的铝，0.008％或更少的N，0.6到1.7％的Cr，0.4到1.0％的Mo，0.01到0.30％的V，0.01到0.06％的Nb，0.0003到0.0030％的B和0.0030％或更少的O 。高强度无缝钢管的组织为回火马氏体相的体积分数为95％以上，且现有奥氏体晶粒的晶粒尺寸数为8.5以上，偏析度指标Ps由a定义。公式Ps = 8.1（X Si + X Mn + X Mo ）+ 1.2X P 与X <将隔离部分含量与平均含量之比的Sub> M 设置为小于65。
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