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ASME SA387 SA387 GR.11/12/22 Boiler and Pressure Vessel Steel Plate SA 387 GR.11 Equivalent Grades : Grade BS ASTM/ASME UNS EN GR.11 621B A387 / SA 387 K11789 - GR.12 620B A387 / SA 387 K11757 3 CRMO ...