The upper boundary for martensite appearance in stainless steel weld metals on the Schaeffler Diagram is shown to be overly conservative. It also does not predict a manganese effect. A modification to the WRC-1992 Diagram is proposed which takes variation of manganese into account. The martensite boundary is based upon magnetic measurements and 2T longitudinal face bend tests of numerous submerged arc weld overlays. Separate boundaries are offered for 1%, 4%, and 10% Mn.