... 316, 316L, 317L, 310S, 904L, etc. 3) Type: Welding neck, Socket welding, Slip-on, Threaded, Lap joint, Blind, etc. 4) Size ... D820mm 4, Pipe fitting made of steel plate from D630mm to D3320mm 5, Socket welding pipe fittings from D3mm to D159mm ... standard, Russia standard and non-standard; high, medium and low voltage models of various specifications of carbon steel, stainless steel, alloy steel material ...