X1CrNiMoCuN20-18-7
1.45476% Mo super austenitic stainless steel — trade name 254 SMO (Outokumpu). PREN 42-44, equivalent to super duplex but fully austenitic = non-magnetic, better weldability, wider temperature range (-196 to +300°C). Strength nearly 2× that of 300-series stainless. Used for seawater systems, offshore oil/gas, FGD scrubbers, bleach plants, and desalination where super duplex is limited by temperature or magnetic concerns.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS S31254 / 254 SMO / F44 | S31254 | REF |
| 🇪🇺 | EN | Europe | X1CrNiMoCuN20-18-7 / 1.4547 | 1.4547 | 100% |
Sources: ASTM A240, EN 10088-3
Chemical composition comparison (wt%)
Side-by-side: X1CrNiMoCuN20-18-7 (EN) (EN 10088-3) vs X1CrNiMoCuN20-18-7 / 1.4547 (EN) (EN 10088-3)
| Element | X1CrNiMoCuN20-18-7 (EN) | X1CrNiMoCuN20-18-7 / 1.4547 (EN) | Overlap |
|---|---|---|---|
| C | 0–0.02% | 0–0.02% | OK |
| Si | 0–0.8% | 0–0.8% | OK |
| Mn | 0–1% | 0–1% | OK |
| Cr | 19.5–20.5% | 19.5–20.5% | OK |
| Mo | 6–6.5% | 6–6.5% | OK |
| Ni | 17.5–18.5% | 17.5–18.5% | OK |
| Cu | 0.5–1% | 0.5–1% | OK |
| N | 0.18–0.22% | 0.18–0.22% | OK |
Mechanical properties
Solution annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 650 | MPa |
| Yield Strength | ≥ 300 | MPa |
| Elongation | ≥ 35 | % |
| Elastic Modulus | ≥ 195 | GPa |
| Density | ≥ 8 | g/cm3 |
Compatibility verdict
X1CrNiMoCuN20-18-7 and X1CrNiMoCuN20-18-7 / 1.4547: 100% 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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