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Procedure for the manufacture of seamless tubes of high-tenacity, high-tenacity, martensitic stainless steel
Procedure for the manufacture of seamless tubes of high-tenacity, high-tenacity, martensitic stainless steel
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机译:高强度,高强度马氏体不锈钢无缝管的制造程序
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摘要
A method of producing a high-strength high-toughness martensitic stainless steel seamless pipe which includes heating a martensitic stainless steel raw material to an austenitic range and subjecting the raw material to piercing and elongating to form an original pipe. The original pipe is cooled to form a structure substantially composed of martensite in the original pipe. The original pipe is reheated to a temperature in the dual-phase range between the Ac1 transformation point and the Ac3 transformation point, and is subjected to finishing rolling at an initial rolling temperature T ( DEG C) between the Ac1 transformation point and the Ac3 transformation point. The original pipe is then cooled to form a processed pipe. The processed pipe is tempered at a temperature below the Ac1 transformation point. The reduction in area R in the finishing rolling step may be in the range of 10% to 90%, and the initial rolling temperature T and the reduction in area R may satisfy the relationship: 800 T - 0.625R 850. IMAGE
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