... WT:2.5~60mm Standards:ASTM A53/ASTM A106/API 5L/API 5CT/JISG3452 /JISG3454/DIN1629 Gr.A,B,X42,X46 ... 45#, 16Mn, A25,A25P,A,B,X42,X46, X52,X56,X60,X70 C20, C45, St52, GB8162, GB8163, GB9711.1- ... 1997, GB3087 Standards:ASTM, API, JIS,DIN, BS,GB, CNSSurface: Varnish coating or according ... and fittings, please feel free to contact us. API 5L/5CT ASTM A106 GR.B/A53 GR.B Seamless ...