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PROCESS FOR MANUFACTURING HIGH-NITROGEN STAINLESS STEEL PIPE WITH HIGH STRENGTH, HIGH DUCTILITY, AND EXCELLENT CORROSION AND HEAT RESISTANCE
PROCESS FOR MANUFACTURING HIGH-NITROGEN STAINLESS STEEL PIPE WITH HIGH STRENGTH, HIGH DUCTILITY, AND EXCELLENT CORROSION AND HEAT RESISTANCE
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机译:高强度,高延展性和优异的耐腐蚀耐热性的高氮不锈钢管的制造工艺
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摘要
A process for manufacturing a high nitrogen stainless steel pipe material includes keeping an outside surface and/or an inside surface of an austenite stainless steel pipe material in contact with a substance that becomes a nitrogen (N) source, heating the steel pipe together with the nitrogen source substance at a temperature of 800° C. to 1100° C. in a range of temperatures not higher than the critical temperature for crystal grain enlargement of the steel pipe material to cause nitrogen to be absorbed into the surface of the pipe and diffused into the steel solid phase, and applying to the heat-treated pipe material annealing treatment in the range of temperatures in vacuum, inert gas including argon gas or an atmosphere of a gas with a reducing substance including H2 gas added thereto, to result in a decrease of nitrogen concentration gradient.
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