Common standards for pipe fittings are 1) welded seamless steel pipe fittings GB/T 12459—20052) butt welded steel pipe fittings made of steel plate GB/T 1340 1—20053) butt welded steel pipe fittings for power stations DL/t695-/kloc-0. 999SH3408 steel butt welded seamless steel pipe fittings SH 3409 steel plate ANSB16.1Socket welded and thread forged pipe fittings ASME/ANSB16.28 steel butt welded small radius elbows and bent backs ASME B 1 6.5 pipe flanges and flange fittings MSS SP-43 forged stainless steel butt welded pipe fittings MSS SP-83 socket welding and threaded union MSS SP-97 socket welding, and the threaded and butt welded ends integrally strengthen the pipe socket ASME b 6544.
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