DIN7300/DIN2391 seamless steel tube: steel grade: A135-A, 10#, A315-B, 20#, St37, St45 High Pressure Seamless Tube ... for Diesel EngineSteel grade: A135-A, 10#, A315-B, 20#, St37, St45 or low alloy steel ... "), WT: 2mm-22mm (0.0787"-0.8661"); Dimension tolerance: O.D.: +/-0.08mm, W.T.: +/-10%;Application: This product adopts advanced ...