Mark & model ： Φ21.3mm~Φ3000mm Material: A105, ST37.2, S235, A350LF2, C22.8, S400, SQ235, A694, 304, 304L, 316, 316L etc. Origin ： Asia and Pacific Area China Quality standard ： International H.S.Classification ： Metal Articles Articles of Iron or Steel 7307 Tube or pipe fittings, of iron or...