Production Method: Heavy wall steel tube is usually produced by seamless steel tube production method, which can be by cold drawn or hot rolled manufacturing process. Usually heavy wall steel tube is based on technical standard ASTM A519.   TORICH manufacturing and Supply Capability for Size: OD 0.5-15mm, WT4.0-80 mm Tolerance: Outer Diameter: +/- 0.05mm Thickness: +/-...