... , painting, cutting. MS ERW black rectangular steel tube/pipe. As the profeesional steel pipes and pipe fittings manufacture in China,we ... cansupply straight seam steel pipe,spiral steel pipe,seamless steel pipe,elbow, bend,end cap,flange, ... with competitive price and excellent product. Description of alloy steel pipes: Technique: high frequency weldThickness: 0.5mm --15mmSize ...