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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
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