I have problem in reviewing QC document for Pressure reducing desuperheating valve (PRDS)material: A216 WCCrating : ASME 600#Plug and seat ring material: 410 SS (ANSI 410)1. i asked for NDE liquid penetrant (PT) test form hard facing area form plu and seat ring material.but our contractor said NDE (PT) test is not required since the material is 410 SS, if the material is 316 SS (A276-316) then it is required.I am confused why plug and seat ring does not require NDE (PT) test if the material 410 SS??I have problem in reviewing QC document for Pressure reducing desuperheating valve (PRDS)material: A216 WCCrating : ASME 600#Plug and seat ring material: 410 SS (ANSI 410)my question:1. i asked for NDE liquid penetrant (PT) test for hard facing area for plu and seat ring material.but our contractor said NDE (PT) test is not required since the material is 410 SS, if the material is 316 SS (A276-316) then it is required.I am confused why plug and seat ring does not require NDE (PT) test if the material 410 SS? unless it is 316SS material. is there any ASME standard for this??

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