Nb-Cr X80钢管不同强度匹配下的接头韧性研究  

Research on Welding Joint Toughness of Nb-Cr X80 Steel Pipe Under Different Strength Matching

作　　者：杨天冰[1] 靳海成[1] 黄志辉[1] 刘文虎[1] 

机构地区：[1]中国石油天然气管道科学研究院,河北廊坊065001

出　　处：《焊管》2011年第5期17-19,23,共4页Welded Pipe and Tube

摘　　要：研究了不同强度匹配下Nb-Cr X80钢手工焊环焊接头的低温韧性和韧脆转变温度,结果表明,在相同的试验条件,不同强度匹配下焊缝中心冲击功变化不大;对于同种强度,焊缝试验温度从-10～-40℃,冲击功随着温度的降低而明显降低,试验温度在-50～-60℃时,冲击功下降变化趋缓。通过实测和曲线拟合得出焊接接头的韧脆转变温度为:低强匹配(E9018焊条)焊缝为-52.4℃,HAZ为-41℃;等强匹配(E10018焊条)焊缝为-50.6℃,HAZ为-54.5℃;高强匹配(E11018焊条)焊缝为-49.2℃,HAZ为-32.5℃。This article studied the impact toughness and fracture apperance transition temperature of Nb-Cr X80 steel SMAW joints under different strength matching.The results indicated that under the same test condition,the impact energy value in weld center did not change obviously under different strength matching;But for the same strength matching,the test temperature was from-10 ～-40 ℃,the impact energy value reduced obviously along with the temperature reducing.When the test temperature was-50 ～-60 ℃,the impact energy value reduced slowly.The ductile-brittle transition temperatures were obtained through actual measurement and the curve fitting：With low strength matching（E9018 electrode） in weld the temperature is-52.4 ℃,in HAZ is-41 ℃.With the same strength matching（E10018 electrode） in weld the temperature is-50.6 ℃,in HAZ is-54.5 ℃.With high strength matching（E11018 electrode） in weld the temperature is-49.2 ℃,in HAZ is-32.5 ℃.

关 键 词：Nb-CrX80钢管 焊条电弧焊 冲击韧性 韧脆转变温度. 

分 类 号：TG407[金属学及工艺—焊接]