Difference in strength, 275 and 355 refer to minimum yield stress of the material (275 MPa and 355 MPa).
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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
S355 in bs
The minimum yield strength of S355 is 355 MPa
7850 kg/m^3
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