... G3444,GB/T3091-2001Zn coating mass200-400g/m2 (glanvaized square pipe)Length of the Gi Square Pipe3m-12mProcessing techniquecoupling, necking, ... punching and so on.Usage industryPetrol, gas, water pipe,construction,chimney pot.PackagingBundle,bulk in container or as per ... processing to the pipes,like making threads,swaging,punch a hole ,flat squazzing etc. We also can do processing to ...