Hobart SubCOR SL 281 Cr description: SubCOR SL 281 Cr is a seamless low-alloy cored wire for welding weathering steel base materials. The nominal weld deposit chemistry is similar to that of many weathering steels, and will provide a color-matching weld patina when joining these materials. Hobart recommends using this wire with the following flux(es): SWX 110.