Dear all,
I got a problem, our sepc says :
- 4" 300# Production Choke Valve, RF (Angle)
- ASTM A-216 Gr. WCB, Stl, Flg’d,
Our supplier uses CS A1020 (Casting) to produce material up to A 216 WCB, is this normal practice as chemical compositions are different, shouldn't CS A216 material be...