X6CrNiNb18-10
1.4550Niobium-stabilized austenitic stainless — European equivalent of AISI 347. Nb (10×C min) binds carbon to prevent Cr-carbide precipitation during welding or service at 400-800°C ("sensitization"). Same base composition as 304 but immune to intergranular corrosion after thermal cycling. Used for welded constructions in chemical plant, nuclear reactor internals, exhaust manifolds, and any 18/10 austenitic application with repeated heat exposure.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 347 / UNS S34700 | S34700 | REF |
| 🇪🇺 | EN | Europe | X6CrNiNb18-10 / 1.4550 | 1.4550 | 100% |
| 🇯🇵 | JIS | Japan | SUS347 | — | 95% |
Sources: ASTM A240, EN 10088-3, JIS G4303
Chemical composition comparison (wt%)
Side-by-side: X6CrNiNb18-10 (EN) (EN 10088-3) vs SUS347 (JIS)
| Element | X6CrNiNb18-10 (EN) | SUS347 (JIS) | Overlap |
|---|---|---|---|
| C | 0–0.08% | — | — |
| Si | 0–1% | — | — |
| Mn | 0–2% | — | — |
| P | ≤ 0.045% | — | — |
| S | ≤ 0.015% | — | — |
| Cr | 17–19% | — | — |
| Ni | 9–11.5% | — | — |
| Nb | ≤ 1% | — | — |
Mechanical properties
Solution annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 500–700 | MPa |
| Yield Strength | ≥ 190 | MPa |
| Elongation | ≥ 40 | % |
| Elastic Modulus | ≥ 200 | GPa |
| Density | ≥ 7.9 | g/cm3 |
Solution annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 510–740 | MPa |
| Yield Strength Rp0.2 | ≥ 200 | MPa |
| Elongation A | ≥ 40 | % |
| Hardness HB | ≤ 215 | HB |
| Impact Energy KV | ≥ 100 | J |
General
| Property | Value | Unit |
|---|---|---|
| Density | 7.9 | g/cm³ |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_annealing | 1000–1080 °C | water/air | — | Rapid cool to avoid sensitization |
| stabilization_anneal | 850–900 °C | air | 2-4h | Optional — drives Nb-C precipitation |
Compatibility verdict
X6CrNiNb18-10 and SUS347: 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.
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