1.natural gas pipe 2.material:ST37,ST35.8,ST44,ST45,ST52; ... , power, foodstuff, papermaking, chemical, medical equipment, boiler heat, exchanger, gas metallurgy, etc.Min Order Quantity1 tonsDelivery Time25 days after conformedQualityFirst ... yearOthers1.Special design available according to requirement2.anti-corrosion and high-temperature resistant with black painting3. All the production process ...