| 摘要 |
PURPOSE:To weld a 9Cr steel with the excellent resistance to cracking at a high temp. by using a welding material contg. specifically composed Ti, REM, C, Cr, Mo, Nb and adjusting adequately the content of O, N, Si and Mn in the weld metal. CONSTITUTION:The welding material contg., by the total weight of the welding material, 0.01-5.0wt% Ti and/or REM, <=0.15% C, 8-13% Cr, 0.8-2.3% Mo and <=0.15% Nb is used. The 9Cr steel is welded by adjusting the contents in the weld metal in a manner as to contain 0.015-0.060% O, 0.003-0.050% N, <=0.6% Si and <=3% Mn to prevent the generation of the cracking at a high temp. and to provide the weld zone having the mechanical performance at the same level as the mechanical performance of the base metal. The application of the 9Cr steel to a thick-walled structure at and under a high temp. and high pressure is thus made possible. |
