This product adopts the high quality coil, retest qualified after slitting or coil of automatic forming and welding, in computer control optimal fusing temperature at the same time, pipe inside and outside burr removal, passing the nondestructive detection of steel pipe in rare oxidation atmosphere in the whole heating to 910 C 950 DEG C is released, descaling by tension reducing mill multi pass rolling, steel pipe throughout the microstructure, grain, geometric dimensions and mechanical properties of full uniform. Product implementation of SPEC 5L API, SPEC 5CT API, EN10217 standard. This product is widely used in the combustible and non combustible fluid transport pipeline and boiler, steel structure. Products to fill gaps in domestic production, the company currently has four production lines, with an annual output of 89- Phi Phi 630mm hot-rolled steel pipe 200 thousand tons.