Alloy 31
1.4562Super austenitic Ni-Cr-Mo alloy — Ni 31%, Cr 27%, Mo 6.5%. Between 926 (Ni 25%) and C-276 (Ni 57%) in the alloy hierarchy. PREN >50. Outstanding resistance to pitting, crevice corrosion, and SCC in highly aggressive chloride and acid environments. Used for FGD scrubbers, phosphoric acid production, sulfuric acid condensers, and seawater systems. Trade name: Nicrofer 3127 hMo (VDM).
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS N08031 / Alloy 31 | N08031 | REF |
| 🇪🇺 | EN | Europe | X1NiCrMoCu32-28-7 / 1.4562 | 1.4562 | 100% |
Sources: ASTM B625, EN 10088-3
Chemical composition comparison (wt%)
Side-by-side: Alloy 31 (UNS) (ASTM B625) vs X1NiCrMoCu32-28-7 / 1.4562 (EN)
| Element | Alloy 31 (UNS) | X1NiCrMoCu32-28-7 / 1.4562 (EN) | Overlap |
|---|---|---|---|
| C | 0–0.015% | — | — |
| Cr | 26–28% | — | — |
| Mo | 6–7% | — | — |
| Ni | 30–32% | — | — |
| Cu | 1–1.4% | — | — |
| N | 0.15–0.25% | — | — |
| Fe | — | — | — |
Mechanical properties
Solution annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 650 | MPa |
| Yield Strength | ≥ 270 | MPa |
| Elongation | ≥ 35 | % |
| Elastic Modulus | ≥ 195 | GPa |
| Density | ≥ 8.1 | g/cm3 |
Compatibility verdict
Alloy 31 and X1NiCrMoCu32-28-7 / 1.4562: 100% composition match
Close equivalents but NOT identical.
Related materials
Hastelloy C-22
2.4602Improved version of Hastelloy C-276 with better resistance to oxidizing media and higher chromium. Considered the most versatile Ni-Cr-Mo alloy for chemical processing. Resists both oxidizing and reducing acids, chlorides, and mixed media. Used for flue gas desulfurization, pharmaceutical, and universal chemical processing.
Alloy 20 / Carpenter 20
2.4660Austenitic Ni-Fe-Cr alloy specifically developed for sulfuric acid resistance. Nb-stabilized against sensitization. Cu addition gives outstanding resistance to H2SO4 at all concentrations up to 80%. Used for sulfuric acid piping, heat exchangers, mixing tanks, pickling equipment, and pharmaceutical processing.
Nimonic 80A
2.4952Nickel-chromium age-hardenable alloy with Ti + Al for gamma-prime strengthening. Developed originally for gas turbine blades. Good creep resistance to ~700°C. Used for exhaust valves, springs at elevated temperatures, nuclear engineering fasteners, and gas turbine components. ≈ UNS N07080.
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