| 摘要 |
PURPOSE:To provide sufficient strength and toughness by using steel contg. specific amts. of C, Si, Mn, Cu, Mo, etc. for a welding wire which uses a gaseou mixture of Ar and a specific amt. range of CO2 as a shielding gas. CONSTITUTION:A Cr-Mo welding drive for heat resistant steel which uses a gaseous mixture of Ar and 10-25% CO2 as a shielding gas is made of the following compsn.: The wire consists, by weight %, of 0.04-0.095 C, <0.5 Si, 0.4- 0.9 Mn, <0.3 Cu, 2.2-2.6 Cr, 0.9-1.2 Mo, <0.04 V, <0.05 Nb, <0.01 Sn+Sb+ As, <0.01 P, <0.01 S, and the balance Fe. In some cases, <0.006 B is added to said compsn. |
