q345b is equivalent to grade 50
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The ASTM equivalent of Q345B is A572 gr.50. This is a steel plate that is used in the construction of large structures like bridges.
low alloyed steel plate Material: Q345B (which is equivalent to S335JR,JIS G3135 , DIN EN10025) Size: Thickness: 8-200mm Width: 1800mm up Length: 6000-12000mm
Q345B is black carbon steel. The specification of a Q345B steel sheet depends on what you want and ranges from 6 to 120mm thick, 1600 to 3200mm wide and 6000 to 12000mm long.
S355 is slightly stronger than Q345B, and the welding is exactly the same. S355NL grade is a normalized steel (fine-grained steel) in the EN10025-3:2004 standard. EN 10025-2 S355JR material is a low-alloy high-strength structural steel that meets the European standard EN10025. ensteelstandardcom/FAQ/what-is-the-difference-between-s355-and-q345b-steel.html
Heat the plate then, insert the rod. Hole in plate slightly smaller than rod.