spiral welded pipe | Q235、Q345、20、X42~X65 | APISpec5L、GB/T9711.1/2-97/99、SY/T5037-2000 | Long-distance transport pipeline used for petroleum, natural gas,
water supply, heat supply, mortar grouting, bittern ,etc.
andproject auxiliaries for chemical industry, electric power,
hot-gas, irrigation, well face, piling tube, etc. | 159~3200×4~24 |