... seamless tube Typesteel pipePetroleum cracking tube pipe 20#petroleum casing tubeseamless tubeSize1/2"-24"Wall thicknessSch5-Sch160XXSStandardANSI, ... A335/ST37/ST52 Packagingpainting black, cap, In bundle.Applications range petroleum, smelting, foodstuff, power, papermaking, chemical, medical equipment, aviation ... are made under the ISO9001:2000 strictly. Petroleum cracking tube petroleum casing tube