13Cr and Stellite Coating 13Cr and Stellite Coating nickypaliwal (Materials) (OP) 24 Aug 15 18:27 Our client asks for 13%Cr coating on SS410 wedge and stellite for seat of valve. Why 13Cr is required on SS410 since it is same material? Does it has any benefit ? Also, is it not necessary to have both closure member and seat facing with hard facing of similar hardness level ? Is it acceptable to coat only seat or closure member ?