Haynes 230
2.4733Nickel-chromium-tungsten alloy — THE combustor can material for gas turbines. Outstanding oxidation resistance to 1149°C for prolonged exposure. Excellent long-term thermal stability (no sigma/mu phase after 16000h at 649-870°C). Lower thermal expansion than most high-temp alloys. Lanthanum addition improves oxide scale adherence. Used for gas turbine combustion cans, transition ducts, furnace retorts, and catalyst grids in nitric acid production.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS N06230 | N06230 | REF |
| 🇪🇺 | EN | Europe | NiCr22W14Mo / 2.4733 | 2.4733 | 100% |
| 🇺🇸 | AMS | USA | AMS 5878 (sheet) / AMS 5891 (bar) | — | 100% |
Sources: ASTM B435, DIN 17744, AMS 5878
Chemical composition comparison (wt%)
Side-by-side: Haynes 230 (UNS) (ASTM B435) vs NiCr22W14Mo / 2.4733 (EN)
| Element | Haynes 230 (UNS) | NiCr22W14Mo / 2.4733 (EN) | Overlap |
|---|---|---|---|
| C | 0.05–0.1% | — | — |
| Si | 0.25–0.75% | — | — |
| Mn | 0.3–1% | — | — |
| Cr | 20–24% | — | — |
| Mo | 1–3% | — | — |
| Ni | — | — | — |
| W | 13–15% | — | — |
| Al | 0.2–0.5% | — | — |
| B | 0–0.015% | — | — |
| Co | 0–5% | — | — |
| Fe | 0–3% | — | — |
| La | 0.005–0.05% | — | — |
Mechanical properties
Solution Treated
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 760 | MPa |
| Yield Strength | ≥ 310 | MPa |
| Elongation | ≥ 40 | % |
| Elastic Modulus | ≥ 211 | GPa |
| Density | ≥ 8.97 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treatment | 1177–1246 °C | rapid air or water | — | Not precipitation-hardenable — solution treated only |
Compatibility verdict
Haynes 230 and NiCr22W14Mo / 2.4733: 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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