Steel welding Cap Describe: CapManufacture Standard:ASME/ANSI B16.9GB12459 (Seamless), GB/T13401 (Welded)SH3408 (Seamless), SH3409 (Welded) TypeOval, Butterfly (with Straight End)Raw MaterialSteel sheetManufacture ProcessCold Pressing, Hot Pressing, Cold machining, Hot machining, Welding, Heat treatment