... Steel Pipe Co., Ltd.Our Steel Pipe (Customized Products Provided)ItemRound Pipe (MM)Square Pipe (MM)Rectangular Pipe (MM)Oval Pipe (MM)LTZ Pipe (MM ... STPG370, STPG410 etc..SurfaceSatiny and Smooth, Oiled or Not, black painted, black varnish, 3PE coating, FBE coating, Bare, varnished, zinc ... shell to form cast-in-place concrete piles,for welded, riveted,or bolted construction of bridges and buildings, ...