... B, X42-X80 Function: Use for Construction, Gas and Oil transportation. Size: 1/2"-40" 1)Product name:&CertificateSeamless ... 1.4438,1.4541 ,ST33,ST37,ST37.2,ST35.8,ST35.4,ST42,ST42.2,ST45.8,ST45.4,ST52.4 ... ,also can be required by customers.9)Usage:For conveying gas,water and oil in both the ... A106,A53,JIS G3452,G3454,;DIN1629,DIN17175,DIN2448 Seamless,welded ST37.2/ST52.4/ST35.8 carbon black Steel Pipe