... transportation. Size: 1/2"-40" 1)Product name:&CertificateSeamless Black Steel Pipe & ISO900, API2)Standard executived:ASTM:ASTM A335,ASTM A213,ASTM ... .8,ST35.4,ST42,ST42.2,ST45.8,ST45.4,ST52.4,ST52,TT ST35N,etc4)O.D.&Wall thickness:Seamless DN15 ... ,JIS G3452,G3454,;DIN1629,DIN17175,DIN2448 Seamless,welded ST37.2/ST52.4/ST35.8 carbon black Steel Pipe