254 SMO / X1CrNiMoCuN20-18-7
1.4547Super-austenitic stainless steel with 6% Mo. PREN >40 for outstanding pitting and crevice corrosion resistance. Bridges the gap between standard austenitics and nickel alloys. Used in seawater systems, flue gas desulfurization, bleach plants, and offshore.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | UNS S31254 | S31254 | REF |
| 🇪🇺 | EN | Europe | X1CrNiMoCuN20-18-7 | 1.4547 | 100% |
Sources: ASTM A240, EN 10088-2
Chemical composition comparison (wt%)
Side-by-side: 254 SMO / X1CrNiMoCuN20-18-7 (EN) (EN 10088-2) vs X1CrNiMoCuN20-18-7 (EN) (EN 10088-2)
| Element | 254 SMO / X1CrNiMoCuN20-18-7 (EN) | X1CrNiMoCuN20-18-7 (EN) | Overlap |
|---|---|---|---|
| C | 0–0.02% | 0–0.02% | OK |
| Si | 0–0.7% | 0–0.7% | OK |
| Mn | 0–1% | 0–1% | OK |
| P | 0–0.03% | 0–0.03% | OK |
| S | 0–0.01% | 0–0.01% | 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 Treated
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 650–850 | MPa |
| Yield Strength | ≥ 300 | MPa |
| Elongation | ≥ 35 | % |
| Elastic Modulus | ≥ 195 | GPa |
| Density | ≥ 8 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 1150–1200 °C | water | Rapid cooling critical | High solution temp needed to dissolve sigma phase |
Compatibility verdict
254 SMO / X1CrNiMoCuN20-18-7 and X1CrNiMoCuN20-18-7: 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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