... :2.5~60mm Standards:ASTM A53/ASTM A106/API 5L/API 5CT/JISG3452 /JISG3454/DIN1629 Gr.A,B,X42 ... St52, GB8162, GB8163, GB9711.1-1997, GB3087 Standards:ASTM, API, JIS,DIN, BS,GB, CNSSurface: Varnish coating or according ... kinds of steel pipes. Such as seamless steel pipe, welded pipe, galvanized pipe, square tube, ERW pipe and ... fittings, please feel free to contact us. API 5L/5CT ASTM A106 GR.B/A53 GR.B ...