| Grade | GB: Q345B, Q345C, Q345D, Q345E, Q390A, Q390B, Q390C, Q390D, Q390E, Q420, Q420B, Q420C, Q420D, Q420E,Q460D, Q460E, Q500D, Q500E, Q550D, Q550E, Q620D, Q620E, Q690D,Q690E EN: S185, S235JR, S275JR, S355JR, S420NL, S460NL S500Q, S550Q, S620Q, S690Q ASTM: Grade B, Grade C, Grade D, Grade 36, Grade 40, Grade 42, Grade 50, Grade 55, Grade 60, Grade 65, Grade 80 JIS: SPHC, SPFC, SPHD, SPHE |
| Standard | ASTM A106 Gr.B A53 Gr.B steel tube AP175-79, DIN2I5L , ASTM A106 Gr.B, ASTM A53 Gr.B, ASTM A179/A192/A213/A210 /370 WP91, WP11,WP22 DIN17440, DIN2448,JISG3452-54 |
| Surface | Bare,Painting black,varnished,galvanized, anti-corrosion 3PE PP/EP/FBE coating, transparent oil, epoxy coating, etc. |