PRODUCT INFORMATION Category: Stainless Steel Wire Alloy: WW630 Class: ER630 Description: ER630 classification is designed primarily for welding ASTM A564 type 630 and some other precipitation-hardening stainless steels. The composition is modified to prevent the formation of ferrite networks in the martensitic microstructure which has a great effect on mechanical properties. The weld metal may be used either as welded, welded and precipitation hardened, or welding and solution treated. Mechanical properties of this alloy are greatly influenced by the heat treatment. Chemical Composition C 0.05 max Cr 16.0-16.75 Ni 4.5-5.0 Mo 0.75 max Mn 0.25-0.75 Si 0.75 max P 0.03 max S 0.03 max Cu 3.25-4.00 Nb 0.15-0.30