X8CrNiS18-9
1.4305THE free-cutting austenitic stainless — AISI 303. Sulfur 0.15-0.35% for short-breaking chips and excellent machinability. Not weldable (hot cracking risk from S). Reduced corrosion resistance vs 304 due to sulfide inclusions. Used for high-volume CNC screw machine production of fittings, shafts, bushings, valves, and any turned stainless part where machining cost dominates.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 303 / UNS S30300 | S30300 | REF |
| 🇪🇺 | EN | Europe | X8CrNiS18-9 / 1.4305 | 1.4305 | 100% |
| 🇯🇵 | JIS | Japan | SUS303 | — | 95% |
Sources: ASTM A582, EN 10088-3, JIS G4303
Chemical composition comparison (wt%)
Side-by-side: X8CrNiS18-9 (EN) (EN 10088-3) vs SUS303 (JIS)
| Element | X8CrNiS18-9 (EN) | SUS303 (JIS) | Overlap |
|---|---|---|---|
| C | 0–0.1% | — | — |
| Si | 0–1% | — | — |
| Mn | 0–2% | — | — |
| S | 0.15–0.35% | — | — |
| Cr | 17–19% | — | — |
| Ni | 8–10% | — | — |
| Cu | 0–1% | — | — |
Mechanical properties
Solution annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 500–750 | MPa |
| Yield Strength | ≥ 190 | MPa |
| Elongation | ≥ 35 | % |
| Hardness HB | ≤ 230 | HB |
| Density | ≥ 7.9 | g/cm3 |
Solution annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 500–700 | MPa |
| Yield Strength Rp0.2 | ≥ 190 | MPa |
| Elongation A | ≥ 35 | % |
| Hardness HB | ≤ 230 | HB |
Compatibility verdict
X8CrNiS18-9 and SUS303: 95% composition match
Close equivalents but NOT identical.
Related materials
304 Stainless Steel
1.4301The most widely used austenitic stainless steel. Excellent corrosion resistance, good formability and weldability. Standard choice for food processing, chemical, and architectural applications.
316L
1.4404Low-carbon austenitic stainless steel with molybdenum addition. Superior corrosion resistance to 304, especially against chlorides and pitting. Standard choice for chemical processing, marine, medical implants, and pharmaceutical equipment.
430 Stainless Steel
1.4016Ferritic chromium stainless steel with good corrosion resistance and formability. Lower cost than austenitic grades. Used for automotive trim, kitchen sinks, architectural panels, and appliance components.
Not sure which material fits?
🤖 Ask AI Advisor →All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.