Precision bright tube inside and outside the wall without oxide layer, withstand high pressure without leakage, high precision, high finish, cold bending without deformation, flaring, flattening without cracks and so on a little, so it is mainly used for the production of pneumatic or hydraulic components of the product, such as cylinders or cylinders, can be a seamless tube, but also welded tubes. The chemical composition of precision bright tube has carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, chromium Cr.