... , L45StandardGB/T9711.1Length5m-12mUsageline pipe, casing and tubing, fluid pipe, water delivery, heating pipe, power pipe, structure pipe, scaffold, piling pipeManufacture ... Shearing and welding-Accumlator-Forming-Telepathy Welding-Seam Heat Treatment-Air/Water Cooling-Body/Seam UT-Sizing Straightening-Cutting-Visual and dimension ...