... GB 3087-1999, GB/T CommodityASTM hot dipped galvanized steel pipeDimension10-426MMThickness0.6-30MMLength5.8-12M or customizedZinc Coatinghot galvanized ... 10-30 days after depositOther productsWelded steel pipe,square/rectangular hollow section,seamless steel pipe, steel strip, steel coil, square bar,flat bar, ... are made under theISO9001:2000 strictly ASTM, EN Cheap carbon steel seamless pipes tubes