Study on Temper Brittleness of Flux Cored Submerged Welding Wire W220
The temper brittleness of flux cored submerged welding wire W220 used for building up of rollers was studied.The composition of deposited metal of flux cored submerged welding wire W220 was 0.13%～0.17%C,13.1%～14.0%Cr,2.2%～2.8%Mn,4.3%～4.9 %Ni.As-welded deposited metal of submerged welding wire W220 were tempered at different temperatures.By means of hardness testing,impact toughness testing and micro-analysis of fracture surface,the hardness,impact energy and fracture surface aspects of samples after tempering were studied.The results show that the tempering brittleness temperature ranges of W220-deposied metal is 400～550 ℃.It is different from general situation that high temperature temper brittleness of W220-deposied metal occurs at quick cooling instead of slow cooling after high temperature tempering heat preservation.