Hastelloy X vs Haynes 230: Both solid-solution combustor alloys — 230 is superior in most aspects
Hastelloy X vs Haynes 230
Side-by-side chemical composition and mechanical property comparison.
Overview
Hastelloy X
2.4665
Nickel-chromium-iron-molybdenum solid-solution superalloy — exceptional combination of oxidation resistance, fabricability, and high-temperature strength. NOT age-hardenable (solid-solution only). Oxidation-resistant to 1200°C, good ductility after 16000h at 650-870°C. Outstanding formability and weldability for a superalloy. Used for gas turbine combustor cans, transition ducts, afterburners, furnace hardware, and petrochemical process equipment.
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.
| Hastelloy X | Haynes 230 | |
|---|---|---|
| Material Number | 2.4665 | 2.4733 |
| Category | Nickel Alloys | Nickel Alloys |
| Standard | ASTM B435 | ASTM B435 |
Chemical composition (wt%)
| Element | Hastelloy X | Haynes 230 | Overlap |
|---|---|---|---|
| C | 0.05–0.15% | 0.05–0.1% | OK |
| Si | 0–1% | 0.25–0.75% | OK |
| Mn | 0–1% | 0.3–1% | OK |
| Cr | 20.5–23% | 20–24% | OK |
Mechanical properties
| Property | Hastelloy X | Haynes 230 | Unit |
|---|---|---|---|
| tensile_strength | 690–760 | ≥ 760 | MPa |
| yield_strength | 275–345 | ≥ 310 | MPa |
| elongation | 35–45 | ≥ 40 | % |
Compatibility Assessment
Haynes 230 has higher creep-rupture strength, better oxidation resistance, and superior thermal stability (W strengthening). Hastelloy X has better fabricability and wider availability. 230 is increasingly replacing X in new gas turbine designs. Choose 230 for new designs; X where proven service history matters.
Frequently Asked Questions
Is Hastelloy X the same as Haynes 230?
Hastelloy X and Haynes 230 have a 70% composition overlap. Both solid-solution combustor alloys — 230 is superior in most aspects
Can I replace Hastelloy X with Haynes 230?
In many cases, yes. The compositions overlap significantly (70%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between Hastelloy X and Haynes 230?
The main differences are in the following elements: Mo, W, Fe. Hastelloy X is a Nickel Alloys grade, while Haynes 230 is a Nickel Alloys grade.
Related Comparisons
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