seamless carbon steel pipe: 1.material:Astm a 53/106/ API 5LA/B,ST37,ST35.8;Standard:ASTM,DIN,JIS 2.ISO and SGS certificate ... , construction ,shipbuilding,smelting, aviation, power, foodstuff, papermaking, chemical, medical equipment, boiler heat, exchanger, gas metallurgy, etc.Min Order Quantity1 tonsDelivery Time25 ...