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    高鉻鐵素體耐熱鋼管發(fā)展中的問題及爭議(下)

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

    • 摘要: 討論高鉻鐵素體耐熱鋼管發(fā)展中的一些問題及爭議。介紹造成高鉻鐵素體耐熱鋼管發(fā)生早期損毀的主要原因——焊接熱影響區(qū)的Ⅳ型開裂；分析國外高鉻鐵素體耐熱鋼管母材和焊接接頭橫向的蠕變斷裂特性，及該產(chǎn)品國產(chǎn)化進展情況和國內(nèi)產(chǎn)品的蠕變特性；解析T/P/G91鋼的Ⅱ型化學(xué)成分設(shè)計及存在的異議；探討高鉻鐵素體耐熱鋼蠕變的宏觀力學(xué)規(guī)律和微觀演化動力，以及焊縫熱影響區(qū)蠕變劣化比母材快和G91鋼焊縫金屬化學(xué)成分附加w（Mn+Ni）≤1.4%的原因等。

       

      Abstract: 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 theⅡtype 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%.

       

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