Forging Parts, Industrial Machinery Parts, Casting & Forging manufacturer / supplier in China, offering DIN2391 St52 Cold Rolled Precision Seamless Steel Pipe Honed Tube Tubing Cylinder, Cold Rolled Stkm11A Seamless Steel Pipe Precision Honed Cylinder Tube for Oil Boiler ASTM En Certified GS, JIS G3445 Stkm17A Precision Seamless Steel Tube Carbon Steel for Drilling Welding Cutting Bending and so on.