tube 1.material:ST37,ST35.8,ST44,ST45,ST52;Standard:DIN1626,1629,1630,17175,2391,2448 2.ISO and SGS ... aviation, power, foodstuff, papermaking, chemical, medical equipment, boiler heat, exchanger, gas metallurgy, etc.Min Order Quantity1 tonsDelivery Time25 days after ... .Special design available according to requirement2.anti-corrosion and high-temperature resistant with black painting3. All the ...