we are professionally in manufacturing SMLS,ERW,SSAW,LSAW steel pipes as follows:Carbon/Aolly Seamless steel pipe (OD 1/4 inch-30inch W.T 1.25mm to 50mm)ERW/LSAW/DSAW steel pipe (OD 1/2inch-52inch W.T 1.65mm to 25mm )Spirally welded steel pipe ( 219mm to 3120mm .W.T 3mm to 25mm)Oil pipe, casing, tubing, line pipe