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13Cr and Stellite Coating

13Cr and Stellite Coating

(OP)
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 ?

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