Our production accord with the standerd of GB/T8163-1999, the specification from 76*4 to 530*10, variety completely, we produce many non-Standard products at the same time, for example: (diameter) 152mm, 140mm, 299mm, 308mm, 351mm, 356mm, 406mm, 500mm, 506mm, 560mm etc, wallthickness from 4mm to 45mm. Our producity is about 200 tons everyday, the products are widely used in long-distance distribution pipelines such as gas, petroleum, chemical industry, power, water resource and so on.