Hastelloy X vs Inconel 625: Gas Turbine Duty
Date: 2026年9月15日 Categories: News Views: 385
By Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier | ISO 9001:2015 | Est. 2012
Contact: sales@hangboalloy.com | hangbo@nickel-alloy.com | WhatsApp (Lisa): +86 13611656360
Quick Answer: What Is the Difference Between Hastelloy X and Inconel 625?
Hastelloy X (UNS N06002) and Inconel 625 (UNS N06625) are both Ni-Cr-Mo high-temperature alloys, but they are optimized for different failure modes. Hastelloy X is designed primarily for high-temperature strength and oxidation resistance in combustion environments — it is the classic alloy for gas-turbine combustion chambers, transition ducts, and afterburner components operating up to ~1200C. Inconel 625 is optimized for corrosion resistance (its 9% molybdenum and niobium) while retaining good high-temperature strength to ~980C. Rule: hot gas/oxidation duty → Hastelloy X; corrosion + moderate heat → 625.
Composition Comparison (wt.%)
| Element | Hastelloy X (N06002) | Inconel 625 (N06625) |
|---|---|---|
| Nickel | Balance (~47%) | Balance (~61%) |
| Chromium | 20.5-23 | 20-23 |
| Molybdenum | 8-10 | 8-10 |
| Iron | 17-20 | 5 max |
| Cobalt | 0.5-2.5 | 1 max |
| Tungsten | 0.2-1.0 | -- |
| Niobium | -- | 3.15-4.15 |
Key: Hastelloy X's higher iron and cobalt content supports high-temperature strength; 625's niobium plus low iron supports corrosion resistance.
High-Temperature Performance Comparison
| Property | Hastelloy X | Inconel 625 |
|---|---|---|
| Max continuous service | ~1200C | ~980C |
| Oxidation resistance | Excellent | Good |
| Creep strength (800C) | Excellent | Good |
| Creep strength (900C) | Good | Moderate |
| Thermal fatigue | Excellent | Good |
| Carburization resistance | Good | Good |
Mechanical Properties (Annealed, RT)
| Property | Hastelloy X | Inconel 625 |
|---|---|---|
| Tensile Strength | 655-760 MPa | 830-960 MPa |
| Yield Strength | 240-345 MPa | 410-550 MPa |
| Elongation | 35-50% | 42-50% |
Which One for Your Application?
| Application | Best Choice | Why |
|---|---|---|
| Combustion chamber liners | Hastelloy X | Oxidation + thermal fatigue |
| Transition ducts | Hastelloy X | High-temp creep |
| Afterburner components | Hastelloy X | 1200C capability |
| Industrial furnace rolls | Hastelloy X | Creep at 1000C |
| Chemical process equipment | Inconel 625 | Corrosion resistance |
| Offshore piping | Inconel 625 | Seawater + acid |
Price Comparison (2026, EXW)
| Form | Hastelloy X | Inconel 625 |
|---|---|---|
| Sheet/Plate | \$40-62/kg | \$50-78/kg |
| Round Bar | \$38-60/kg | \$48-75/kg |
| Tube | \$48-72/kg | \$60-95/kg |
Inconel 625 is typically 20-30% more expensive due to higher nickel and niobium content.
FAQ
Q1: Is Hastelloy X better than Inconel 625?
For high-temperature oxidation and creep above 1000C, yes. For corrosion resistance, 625 is superior.
Q2: What are the UNS numbers?
N06002 = Hastelloy X; N06625 = Inconel 625.
Q3: Can Hastelloy X be used at 1200C?
Yes, for continuous service in oxidizing atmospheres; not recommended in reducing/sulfidizing environments.
Q4: Which has better corrosion resistance?
Inconel 625, thanks to its molybdenum and niobium.
Q5: Which is more expensive?
Inconel 625 is typically 20-30% more expensive.
Q6: Which for gas turbine combustors?
Hastelloy X — the historical standard for combustion components.
Q7: What does Shanghai Hangbo supply?
Both grades in sheets, plates, bars, and tubes with EN 10204 3.1 certification. SGS/TUV/BV available.
Contact & Complete Product Range
Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier
Email: sales@hangboalloy.com | WhatsApp (Lisa): +86 13611656360 | www.nickel-alloy.com
All Grades
Ni: NI200-N6 | Monel: 400-502, K-500, R-405 | Inconel: 600-740H, X-750, 725 | Incoloy: 800-27-7MO | Hastelloy: C-276-HYBRID-BC1, N | Super Austenitic: 904L-AL-6XN | Chromium-Rich: Alloy 33 | High-Strength Stainless: Nitronic 50/60, PH13-8Mo | Chlorination: Alloy 45 | Nimonic: 75-263 | Haynes: 25-HR-160 | RA: 330/333 | Precision: 1J22-4J45 | High-Strength: 18Ni250-AerMet100 | Heating: Cr20Ni80/60 | Specialty: Alloy 20-602CA
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