Standard, non-alloy S275JR per EN 10025-2 does not contain intentional additions of microalloying elements like Niobium (Nb), Vanadium (V), or Titanium (Ti). These elements are hallmarks of high-strength low-alloy (HSLA) steels like S355MC or S460.
However, in modern steelmaking, residual amounts of these elements may be present from scrap metal used in the Electric Arc Furnace (EAF) melting process. Their levels are usually kept very low (<0.01% each) and are not specified in the standard.
If present in trace amounts, their effect is negligible on the properties of S275JR. The strength of S275JR is achieved primarily through:
Carbon and manganese content (solid solution strengthening).
Pearlite volume fraction.
Grain refinement from controlled hot rolling.
The deliberate addition of microalloying elements is a cost-intensive process used to create higher-strength grades (e.g., S355, S460) through precipitation strengthening and finer grain refinement, which is unnecessary for achieving the S275 grade level.