The yield strength (ReH) shall not be less than 420 MPa; the tensile strength (Rm/Re) must be at least 1.15 times the yield strength; and the total elongation at maximum force (Agt) shall be guaranteed to be 7.5 per cent or higher. With regard to the control of chemical composition through smelting analysis, the carbon (C) content is capped at 0.22 per cent, whilst harmful elements such as phosphorus (P) and sulphur (S) are strictly limited to 0.050 per cent or less, ensuring excellent on-site weldability.