General bright mild steel bar — weldable, case-hardenable, good all-rounder for machined parts.
| Property | Typical value |
|---|---|
| Density | 7850 kg/m³ |
| Yield | ~215 MPa (hot rolled/normalised); ~350+ MPa (bright drawn, size-dependent — verify batch) |
| Tensile | 430–500 MPa (normalised/turned); ~500–560 MPa (bright drawn) |
| Elongation | ~20 % (normalised); ~10–14 % drawn |
| Young's E | 210 GPa |
| Hardness | ~130 HB |
| CTE | ~12 µm/m·K |
| Thermal cond. | ~50 W/m·K |
| Max service | ~350–400 °C |
| Poisson ν | ~0.29 |
| Shear modulus G | ~81 GPa (derived) |
| Shear strength | ≈0.6 × UTS (design convention — not test data) |
| Specific heat | ~460–480 J/kg·K |
| Elec. resistivity | ~0.15–0.20 µΩ·m |
| Melting range | ~1450–1520 °C |
| Fatigue (indicative) | ~190–250 MPa (≈0.45–0.5 × UTS) — rotating-bend, polished specimen; indicative only, surface/size/loading factors apply |
~60%. Gummier than EN1A; sharp tooling, good coolant.
Readily weldable; can be case-hardened (carburised) for wear surface.
| System | Designation |
|---|---|
| EN | C22E / 1.1151 (≈C22 / 1.0402) |
| DIN | Ck22 / C22 |
| AISI | 1020 |
| JIS | S20C |
| BS | BS 970 070M20 (EN3B) |
| UNS | G10200 |
Equivalents & alternatives: 070M20 (EN3B); 1.0402 (C22); AISI 1020. Alt: EN1A (better machining), EN8 (higher strength).
General structural mild steel — sections, plate, weldments. The default for fabrication.
Carbon steelHigher-strength structural steel — same weldability as S275 with ~30% more yield.
Carbon steelFree-cutting bright mild steel — first choice for high-volume machined parts, studs, fittings.
Carbon steelMedium-carbon steel — shafts, studs, gears, keys. Through-hardenable to moderate strength.
