PRODUCT INFORMATION Category: Stainless Steel Wire Alloy: WW420 Class: ER420 Description: ER420 This alloy is often used for surfacing applications which call for superior resistance to abrasion. It requires preheat and interpass temperatures of not less than 400°F, followed by slow cooling. Post weld heat treatment is used to temper the weld deposit. Chemical Composition C 0.25-0.40 Cr 12.0-14.0 Ni 0.60 max Mo 0.75 max Mn 0.60 max Si 0.50 max P 0.03 max S 0.03 max Cu 0.75