Equivalent grades of steel X8CrNiS18-9 (1.4305)
Jun 04, 2025
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X8CrNiS18-9 (1.4305) is a free-machining austenitic stainless steel grade defined under the EN standard, and it is equivalent to AISI 303 (UNS S30300) in the American system and SUS303 in the Japanese JIS standard. Other equivalents include BS 303S21 (UK) and AFNOR Z8CNF18-09 (France).
Equivalent grades of steel X8CrNiS18-9 (1.4305)
| Standard | Equivalent Grade |
|---|---|
| EN | X8CrNiS18-9 (1.4305) |
| AISI / ASTM | 303 / UNS S30300 |
| JIS (Japan) | SUS303 |
| ISO | X8CrNiS18-9 |
| BS (UK) | 303S21 |
| AFNOR (France) | Z8CNF18-09 |
| GOST (Russia) | 08Х17Н9С4 |
SUS303 equivalent material
| Grade : | X8CrNiS18-9 | |||||
| Number: | 1.4305 | |||||
| Classification: | Austenitic stainless steel | |||||
| Density: | 7.9 g/cm ³ | |||||
| Standard: |
|
Material Properties of SS303 / 1.4305
| Property | Typical Value |
|---|---|
| Tensile Strength (Rm) | 500–750 MPa |
| Yield Strength (Rp0.2) | ≥ 190 MPa |
| Elongation (A5) | ≥ 35% |
| Hardness (HB) | ≤ 230 HB |
| Density | 7.9 g/cm³ |
| Thermal Conductivity | ~16.3 W/m·K at 100 °C |
| Modulus of Elasticity | ~200 GPa |
| Magnetic Response | Non-magnetic in annealed state (may become slightly magnetic after cold working) |
SS303 vs SS304 – What's the Difference?
| Feature | SS303 (1.4305) | SS304 (1.4301) |
|---|---|---|
| Machinability | Excellent (due to sulfur) | Moderate |
| Corrosion Resistance | Lower than 304 | Higher |
| Weldability | Poor (not recommended) | Excellent |
| Typical Use | Turned parts, fasteners, bushings | Tanks, sinks, food equipment |
| Sulfur Content | 0.15–0.35% | ≤ 0.03% |
