高铬铁素体耐热钢管发展中的问题及争议(下)  

Controversial Issues Concerning Development of Hi-Cr Ferrite Heat-resisting Steel Tube(Part Ⅲ)

作　　者：何德孚 王晶滢 HE Defu;WANG Jingying(Shanghai Jiuli Industrial and Trade Development Co.,Ltd.,Shanghai 200135,China;Zhejiang Datrans Piping Co,Ltd.,Huzhou 313103,China)

机构地区：[1]上海久立工贸发展有限责任公司,上海200135 [2]浙江德传管业有限公司,浙江湖州313103

出　　处：《钢管》2020年第1期7-13,共7页Steel Pipe

摘　　要：讨论高铬铁素体耐热钢管发展中的一些问题及争议。介绍造成高铬铁素体耐热钢管发生早期损毁的主要原因--焊接热影响区的Ⅳ型开裂;分析国外高铬铁素体耐热钢管母材和焊接接头横向的蠕变断裂特性,及该产品国产化进展情况和国内产品的蠕变特性;解析T/P/G91钢的Ⅱ型化学成分设计及存在的异议;探讨高铬铁素体耐热钢蠕变的宏观力学规律和微观演化动力,以及焊缝热影响区蠕变劣化比母材快和G91钢焊缝金属化学成分附加w(Mn+Ni)≤1.4%的原因等。Discussed here in the essay are some controversial issues related to development of the hi-Cr ferrite heatresisting steel tube. Described is the critical reason for the early-stage damage of such tube,i.e.,the Ⅳ type cracking as occurring in the welding HAZ. Also analyzed are the property of the transversal creep rupture of the base metal and the weld joint of a certain hi-Cr ferrite heat-resisting steel tube as imported from abroad, and the progress as made in localization of such tube,and the creep property of the similar tube as made at home. Analyses are carried out for the Ⅱtype chemical composition design of T/P/G91 steels as well as relevant objections. Discussed are the macro mechanics law and micro dynamic evolution of the said steel,and the reasons for that the creep deterioration of the weld seam HAZ is faster than that of the base metal,and that the additional w(Mn+Ni)of the weld seam metal chemical composition of G91 steel is ≤1.4%.

关 键 词：耐热钢管 高铬铁素体 服役寿命 蠕变断裂强度 蠕变速率 扩散和蠕变劣化 Ⅳ型开裂 

分 类 号：TG142.73[一般工业技术—材料科学与工程]