1.Commodity:large diameter galvanized welded steel pipe 2.Small order acceptable 3. Delivery ... spiral steel pipe, hot dip galvanized steel pipe , large diameter galvanized welded steel pipe ,electric galvanized pipe, pre-galvanized pipe, square and rectangular ... liquids conveyance, such as water, gas, and construction4) Surface: Galvanized (inside & outside)5) Zinc coating: 300-400g/m26)Small ...