Free-machining austenitic stainless — fittings, shafts, fasteners where corrosion + machining matter.
| Property | Typical value |
|---|---|
| Density | 8000 kg/m³ |
| Yield | ~190 MPa |
| Tensile | 500–700 MPa |
| Elongation | ~40 % |
| Young's E | 193 GPa |
| Hardness | ≤230 HB |
| CTE | ~17 µm/m·K |
| Thermal cond. | ~16 W/m·K |
| Max service | ~760 °C |
| Poisson ν | ~0.29–0.30 |
| Shear modulus G | ~75 GPa (derived) |
| Shear strength | ≈0.6 × UTS (design convention — not test data) |
| Specific heat | ~500 J/kg·K |
| Elec. resistivity | ~0.73 µΩ·m |
| Melting range | ~1400–1420 °C |
| Fatigue (indicative) | — (sulphide inclusions degrade fatigue — prefer 304/316 for cyclic duty) |
~78%. Sulphur aids chip; still work-hardens — sharp tools, positive feed.
Sulphur causes hot cracking — not recommended for welding. Use 304 if welding needed.
| System | Designation |
|---|---|
| EN | X8CrNiS18-9 / 1.4305 |
| DIN | X10CrNiS18-9 / 1.4305 |
| AISI | 303 |
| ASTM | A582 303 |
| JIS | SUS303 |
| BS | BS 970 303S31 |
| UNS | S30300 |
Equivalents & alternatives: 1.4305 (X8CrNiS18-9); AISI 303; UNS S30300. Alt: 304 (weldable), 316 (better corrosion).
The workhorse austenitic stainless — food, architectural, general corrosion resistance, weldable.
Stainless steelMolybdenum-bearing austenitic — the default grade for marine, chemical and chloride environments.
Stainless steelFerritic, magnetic, nickel-free stainless — trim, appliance panels, splashbacks. Cheaper than 304 with lower corrosion resistance and toughness.
