| 摘要 |
PURPOSE:To prevent exactly a hydrogen peeling crack by forming a build-up weld layer which contains C, Si, Mn, Cr, Ni, Mo, Nb and N respectively in specific wt% and of which the delta ferrite amt. calculated by the prescribed formula is within a prescribed range. CONSTITUTION:The build-up weld layer of an austenitic stainless steel is formed to have the compsn. contg. <=0.1% C, <=1.0% Si, <=3.0% Mn, 17.0-23.0% Cr, 7.0- 15.0% Ni, <=0.4% Mo and <=1.0% Nb and consisting of 0.08-0.20% N. The calculated value of the delta ferrite by the prescribed formula is kept within a -2.0-20.0% range, by which generation of a blowhole is obviated and the resistance to the hydrogen peeling crack of a vessel or the like to be used in a hydrogen atmosphere is prevented and said hydrogen peeling crack is prevented. |
