PRODUCT INFORMATION Category: Stainless Steel Wire Alloy: WW309L Class: ER309L Description: ER309L has the same qualities as 309 but with the lower carbon content deemed necessary in many chemical applications. ER309L is preferred over ER309 for cladding over carbon steel or low alloy steels, as weld as for dissimilar joints that undergo heat treatment. Chemical Composition C 0.03 max Cr 23.0-25.0 Ni 12.0-14.0 Mn 1.0-2.5 Si 0.30-0.65 P 0.03 max S 0.03 max Mo 0.75 max Cu 0.75 max