Material: A106 GR B, A53 GR B,API 5L GR B, X42-X80 Function: Use for Construction, Gas and Oil transportation. Size: 1/2"-40" 1)Product name:&CertificateSeamless Black Steel Pipe & ISO900, API2)Standard executived:ASTM:ASTM A335,ASTM A213,ASTM A269,ASTM A312,ASTM A333,ASTM A106,ASTM A53,ASTMA210,ASTM A179,ASTM A192,ASTM A178,ASTM A199DIN:DIN17175-79,DIN17458,DIN1629,DIN1626,DIN2448JIS:JIS G3467- ...