... :Black painting or oiled steel square tube 1)Thickness:0.5 ... CategoryMetallurgy, Mineral & EnergyTechniqueWelded,ERW Cold Rolled,Hot RolledSurfaceBared, Galvanized ... for Survival, Product for Development, Credibility for Cooperation and Service for ... steel pipe manufacturing group. We have cooperated with Bao steel, Wu yang steel, TPCO, Baotou steel, Shou gang Jin tang Steel, An gang Steel, Daye Steel ...