... , 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 ... price and excellent product. Description of alloy steel pipes: Technique: high frequency weldThickness: 0.5mm ... /Z window section 28mm/38mm 0.5mm-1.5mm any length Samples: