... 16MN(Q345B) ASTM A53 GR. A , GR. B, GR. C ASTM A106 GR. A , GR. B, GR. C DIN 162 St 37 ... .0, St 44.0, St 52.0 API 5L A B X42,X46, X52, X60, X65, X70, X80 ASTM ... steel pipe: ASTM A 53 specification for black steel seamless pipes ASTM A 106 Gr. B seamless carbon steel pipes ... painting as customer's request. Size:(outer diameter,wall thickness,length) Outer diameter:21.3mm-762mm Wall thickness:2.11mm ...