| Steel Grade (DIN) | Carbon Content (C%) | Tensile Strength (MPa) | Typical Use | | :--- | :--- | :--- | :--- | | (or RRSt 2) | ≤ 0.10% | 280 – 420 | Simple bending, non-critical deep drawing | | St 3 (or RRSt 3) | 0.08 – 0.15% | 320 – 460 | General cold forming, washers, clips | | St 4 (or RRSt 4) | 0.12 – 0.22% | 370 – 520 | High-strength stampings, springs, saw blades | | St 5 | 0.18 – 0.28% | 440 – 620 | High wear resistance, leaf spring strips |
is a withdrawn German standard. It was titled “Steel grades with specific magnetic properties – Technical delivery conditions for flat products made of magnetic steel” (roughly: Magnetic steel strip for electrical and electromechanical devices ). din 1624 standard pdf
For legal and compliance reasons, the most reliable source is the original publisher. | Steel Grade (DIN) | Carbon Content (C%)
Engineering universities often maintain archives of historical standards. din 1624 standard pdf