In this paper, we review the evolution of 12CrlMoV steel standards at home and abroad, analyze the effects of various elements and determine their optimal contents in steel. The influence of heat treatment and microst...In this paper, we review the evolution of 12CrlMoV steel standards at home and abroad, analyze the effects of various elements and determine their optimal contents in steel. The influence of heat treatment and microstructure on the creep strength of 12CrlMoV steel is investigated. Statistical results from conventional mechanical properties, ductile-brittle transition temperature, high temperature oxidation resistance, aging, instant high temperature properties, and creep are introduced. The results show that the chemical composition and heat treatment process of 12CrlMoVG steel identified in the GB 5310 - 2008 standard is appropriate, resulting in a steel with higher creep strength and good comprehensive properties.展开更多
采用微合金化技术,以低C含Mn钢为基础,设计出壁厚大于25 mm X65Q钢级管线用无缝钢管的化学成分,并通过实验室研究确定出最佳热处理工艺。试验结果表明,采用“910℃淬火+670℃回火”热处理工艺时,材料的强度及低温冲击韧性匹配良好,钢中...采用微合金化技术,以低C含Mn钢为基础,设计出壁厚大于25 mm X65Q钢级管线用无缝钢管的化学成分,并通过实验室研究确定出最佳热处理工艺。试验结果表明,采用“910℃淬火+670℃回火”热处理工艺时,材料的强度及低温冲击韧性匹配良好,钢中的显微组织主要为贝氏体+少量回火索氏体,晶粒度为8.5级;工业化批量生产检验,材料在-30℃低温冲击功达120 J以上,材料的屈服强度有近80 MPa富余量。设计的钢种可用于壁厚大于25 mm的X65Q及以上钢级管线管生产,满足用户相关性能指标要求。展开更多
文摘In this paper, we review the evolution of 12CrlMoV steel standards at home and abroad, analyze the effects of various elements and determine their optimal contents in steel. The influence of heat treatment and microstructure on the creep strength of 12CrlMoV steel is investigated. Statistical results from conventional mechanical properties, ductile-brittle transition temperature, high temperature oxidation resistance, aging, instant high temperature properties, and creep are introduced. The results show that the chemical composition and heat treatment process of 12CrlMoVG steel identified in the GB 5310 - 2008 standard is appropriate, resulting in a steel with higher creep strength and good comprehensive properties.