Haynes 230 vs Inconel 625: Both high-performance Ni alloys — different strengthening mechanisms
Haynes 230 vs Inconel 625
Side-by-side chemical composition and mechanical property comparison.
Overview
Haynes 230
2.4733
Nickel-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.
Inconel 625
2.4856
Nickel-chromium-molybdenum-niobium superalloy. Solid-solution strengthened (no precipitation hardening required). Outstanding corrosion resistance from cryogenic to 982°C. Used for jet engine exhaust systems, marine components, chemical processing, flare stacks, and nuclear applications.
| Haynes 230 | Inconel 625 | |
|---|---|---|
| Material Number | 2.4733 | 2.4856 |
| Category | Nickel Alloys | Nickel Alloys |
| Standard | ASTM B435 | ASTM B443 |
Chemical composition (wt%)
| Element | Haynes 230 | Inconel 625 | Overlap |
|---|---|---|---|
| C | 0.05–0.1% | 0–0.1% | OK |
| Si | 0.25–0.75% | 0–0.5% | Partial |
| Mn | 0.3–1% | 0–0.5% | Partial |
| Cr | 20–24% | 20–23% | OK |
Mechanical properties
| Property | Haynes 230 | Inconel 625 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 760 | ≥ 827 | MPa |
| yield_strength | ≥ 310 | ≥ 414 | MPa |
| elongation | ≥ 40 | ≥ 30 | % |
Compatibility Assessment
Haynes 230 uses W (14%) for solid-solution strengthening and excels in oxidation to 1149°C with outstanding thermal stability. Inconel 625 uses Mo+Nb for higher strength and better aqueous corrosion resistance. Choose 230 for gas turbine combustors (max oxidation); 625 for marine/chemical (max corrosion).
Frequently Asked Questions
Is Haynes 230 the same as Inconel 625?
Haynes 230 and Inconel 625 have a 40% composition overlap. Both high-performance Ni alloys — different strengthening mechanisms
Can I replace Haynes 230 with Inconel 625?
Generally not recommended. The compositions differ significantly (40% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between Haynes 230 and Inconel 625?
The main differences are in the following elements: Si, Mn, Mo, Al. Haynes 230 is a Nickel Alloys grade, while Inconel 625 is a Nickel Alloys grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
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