ASTM A106 steel pipe is mainly used for the transportation of oil, natural gas, water and coal gas, even some solid materials. Its raw materials come into carbon steel and alloy steel, and it is manufactured strictly according to ISO9001 quality management system, resulting in high quality. Size of ASTM A106 Steel Pipe Seamless Pipe: 1/2\" ~24\", DN15~DN600, OD21.3MM~609.6MM Welded Pipe: 1/2\" ~48\", DN15~DN1200, OD21.3MM~1219.2MM