ASTM STANDARD RELATED BOOK TO STEEL PIPING, TUBING,& FITTINGS WILL BE A GOOD REFERANCE TO YOU .
ASTM A216 : IT HAS THREE GRADE AS WCA,WCB&WCC ,IT COVERS CARBON STEEL CASTINGS FOR VALVES, FLANGES,FITTINGS FOR HIGH TEMPERATURE SERVICE .
GR. WCA GR.WCB GR.WCC
YIELD POINT 30000 36000 40000
MIN (PSI)