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high strength seamless stainless steel tube and method for manufacturing high strength seamless stainless steel tube
high strength seamless stainless steel tube and method for manufacturing high strength seamless stainless steel tube
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机译：高强度无缝不锈钢管及其制造方法
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摘要
A high strength seamless stainless steel tube that can acquire high strength and high hardness along with excellent corrosion resistance, preventing frequent occurrence of bearing failures is provided. a crude steel tube material having a composition comprising by weight 0.05% or less and 1.0% or less by itself, 0.1 to 0.5% min, 0.05% or less p, 0.005% or less s, more than 16.0% to 18.0% or less cr, more than 2.0% to 3.0% or less by hand, 0.5 to 3.5% cu, 3.0% or more and less than 5.0% ni, 0.01 to 3.0% w, 0.01 to 0.5% nb, 0.001 to 0.3% ti, 0.001 to 0.1% al, less than 0.07% n, and 0.01% or less is heated at a heating temperature which falls within a range of 1210 to 1350 ° C and where an average grain size at (µm) of precipitates of ti and nb at heating temperature and a sum of amounts b (mass%) of ti and nb precipitated satisfy a / b2 / 3¿14,0. A seamless steel pipe is formed by applying the hot pipe to the raw material of heated steel pipe. The seamless steel tube is cooled and then quenching treatment is performed at a heating temperature of 850 to 1050 ° C. Then tempering treatment is performed. thus, it is possible to provide a high strength seamless stainless steel tube having high strength having elastic limit ys of 758 mpa or greater, high hardness having a ve-10 absorption energy value of 40j or more and excellent corrosion resistance.
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