Would anyone happen to know the hardness values (Brinell or Vickers would be great) for steel grades S235 and S255?
Any help would be appreciated.
Not enough information given - which code or standard, specification and condition are you interested in.
Wild [educated] guess for hardness: assuming carbon steel with a maximum tensile of 70ksi/ 500 MPa, the hardness should be a HB [brinnell 3000 kg] of about 200.
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