Client piping specification stipulates A216 WCB as check valve body matrial. Vendor is propsing  A487 Gr 4C. Shall I accept or not.
Service: Gas injection
design pressure: 450 bars@70°C
Gas: Not coorosive
ASTM A487 material is generally much higher strength than A216 so given your design pressure, it was probably selected for that reason. However, this is not a listed material in ASME B16.34 so the valve would not be able to be stamped as an ASME B16.34 valve if that is a consideration - depending on the valve standard it is made to, it might be considered an unlisted component under B31.3.
In sour (containing hydrogen sulfide) service, the material may be questionable since the high strength may lead to problems meeting NACE/ISO requirements. 
Other than sour service, I can't think of a general problem with the material right now.

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