... )Coil DM: I.D: Φ508mm/610mm O.D: Max Φ1400mmSurface type: Big spangle ,normal spangle, min-spangle, zero-spangle;Surface treatment ... -2.5Main usageWelded pipe production, billet for cold-formed steel, C/U channel, T-bar, saw blade, washer, blade etc.Annual output150 ... of 130,000 square meters, equipped with 2 advanced 1250 type prepainted steel coil production lines, 1 hot-dip galvanized steel ...