Nickel Alloy 625 / 2.4856 / UNS N06625 Datasheet
Nickel Alloy 625 Superalloy – UNS N06625 Bar, Sheet, Pipe, Strip & Custom Forgings
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Key Features:
✅ Solid-solution strengthened – no age hardening required
✅ Outstanding resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking
✅ Excellent oxidation resistance up to 1,050°C
✅ High creep-rupture strength from cryogenic to elevated temperatures
✅ Good fabricability and weldability
✅ Fatigue and thermal fatigue resistance
✅ Maintains dimensional stability under thermal cycling
Material Considerations:
Higher cost than standard stainless steels – but offers superior corrosion resistance and temperature capability
Machining requires appropriate tooling, particularly when work-hardened
Creep resistance suitable for long-term exposure up to ~980°C
Technical Specifications
Chemical Composition (Typical Values)
| Element | Content (%) | Element | Content (%) |
|---|---|---|---|
| Nickel (Ni) | ≥ 58.0 | Manganese (Mn) | ≤ 0.50 |
| Chromium (Cr) | 20.0 – 23.0 | Silicon (Si) | ≤ 0.50 |
| Molybdenum (Mo) | 8.0 – 10.0 | Phosphorus (P) | ≤ 0.015 |
| Iron (Fe) | ≤ 5.0 | Sulfur (S) | ≤ 0.015 |
| Niobium + Tantalum (Nb+Ta) | 3.15 – 4.15 | Aluminum (Al) | ≤ 0.40 |
| Cobalt (Co) | ≤ 1.0 | Titanium (Ti) | ≤ 0.40 |
| Carbon (C) | ≤ 0.10 | Copper (Cu) | ≤ 0.07 |
Chemical composition conforms to ASTM B443, B444, B446, and AMS 5599,AMS 5666 specifications. Actual mill test report values are provided with every shipment.
Mechanical Properties (Typical Values – Annealed)
| Property | Value |
|---|---|
| Tensile Strength | 120 – 150 ksi (830 – 1,100 MPa) |
| Yield Strength (0.2% Offset) | 60 – 95 ksi (414 – 655 MPa) |
| Elongation | 30 – 60% |
| Hardness | ≤ 300 HB |
| Modulus of Elasticity | ~207 GPa (30,000 ksi) |
Mechanical Properties at Elevated Temperatures
| Temperature (°C) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| 24 (Room) | ≥ 830 | ≥ 415 | ≥ 30 |
| 200 | ~ 760 | ~ 380 | ~ 35 |
| 400 | ~ 725 | ~ 360 | ~ 35 |
| 600 | ~ 690 | ~ 340 | ~ 40 |
| 800 | ~ 490 | ~ 290 | ~ 50 |
Values are typical and may vary based on product form and heat treatment condition.
Physical Properties
| Property | Value |
|---|---|
| Density | 8.44 g/cm³ (0.305 lb/in³) |
| Melting Range | 2,350 – 2,460°F (1,290 – 1,350°C) |
| Maximum Service Temperature | Up to 1,800°F (980°C) |
| Thermal Conductivity (20°C) | ~ 9.8 W/m·K |
| Specific Heat Capacity (20°C) | ~ 410 J/kg·K |
| Electrical Resistivity (20°C) | ~ 128 μΩ·cm |
| Coefficient of Thermal Expansion (20-100°C) | ~ 12.8 × 10⁻⁶/°C |
Available Product Forms
ZYTC Alloy offers alloy 625 in a wide variety of product forms to meet diverse industrial requirements. Our manufacturing and stocking capabilities ensure reliable supply for both standard and custom orders.
| Product Form | Size Range | Specifications |
|---|---|---|
| Round Bar | 10mm – 350mm | Hot-rolled, forged, or peeled/bright – ASTM B446, AMS 5666 |
| Flat Bar | Custom widths/thicknesses | ASTM B446 |
| Sheet | 0.5mm – 6mm thick | ASTM B443, AMS 5599 |
| Plate | 6mm – 50mm thick | ASTM B443, AMS 5599 |
| Seamless Pipe | OD 6mm – 300mm | ASTM B444, ASME SB444 |
| Welded Pipe | Custom OD and wall thickness | ASTM B705 |
| Seamless Tube | OD 4mm – 150mm | Various wall thicknesses – ASTM B444 |
| Forgings | Rings, discs, blocks, flanges, shafts | Custom per drawing – ASTM B564 |
| Wire | 0.5mm – 8mm | Various tempers – ASTM B446 |
| Welding Wire | ERNiCrMo-3 | AWS A5.14, AMS 5837 |
Custom Processing Services
ZYTC Alloy understands that every project has unique requirements. We provide comprehensive custom processing services to help you get exactly what you need – reducing your downstream operations and saving valuable time.
Applications
Inconel 625's unique combination of properties – high strength, exceptional corrosion resistance, and good fabricability – makes it the material of choice for critical applications across multiple high-performance industries.
Aerospace
Ducting systems, exhaust components, engine hardware, turbine shrouds, seals, fuel lines, and structural fasteners.
Marine & Offshore
Seawater piping, propeller blades, subsea connectors, offshore platform equipment, and marine exhaust systems.
Chemical Processing
Reactors, heat exchangers, pumps, valves, piping systems, acid-resistant equipment, and FGD systems.
Oil & Gas
Downhole tubing, wellhead equipment, subsea manifolds, sour service components (NACE MR0175), and high-pressure piping.
Power Generation
Gas turbine components, nuclear reactor parts, steam generator tubing, and exhaust systems.
Pulp & Paper
Digester components, bleaching equipment, and recovery boiler systems.
 | Quality AssuranceQuality is at the core of everything we do at ZYTC Alloy. Our comprehensive quality assurance system ensures that every product leaving our facility meets or exceeds your expectations. We are committed to delivering materials you can trust, backed by full documentation and traceability. Certifications & Compliance
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Frequently Asked Questions
What is Inconel 625 used for?
Inconel 625 is used across aerospace (ducting, exhaust systems), marine (seawater piping, propellers), chemical processing (reactors, heat exchangers), oil & gas (downhole tubing, wellhead equipment), and power generation (gas turbine components).
What are the equivalent standards for Inconel 625?
Inconel 625 corresponds to UNS N06625, ASTM B443/B444/B446, AMS 5599/5666, DIN/EN 2.4856, GB/T GH3625, and NACE MR0175/ISO 15156-3.
What is the maximum service temperature for Inconel 625?
Inconel 625 can operate at temperatures up to 1,800°F (980°C) while maintaining good mechanical properties. Oxidation resistance extends to 1,050°C.
Can Inconel 625 be welded?
Yes. Inconel 625 offers excellent weldability. Filler metal ERNiCrMo-3 (AWS A5.14) is commonly used, with TIG/MIG as recommended processes.
What forms does ZYTC Alloy supply Inconel 625 in?
We supply Inconel 625 in round bar, flat bar, sheet, plate, seamless pipe, welded pipe, tube, forgings (rings, discs, blocks, flanges), wire, and welding wire. Custom sizes available.
Do you provide mill test reports?
Yes. Every shipment includes a complete, traceable Mill Test Report (MTR) with chemical composition and mechanical properties. Additional documentation (EN 10204 Type 3.1/3.2, third-party reports) is available upon request.
What is your minimum order quantity?
We have no fixed MOQ for standard stock items. Small quantities are welcome – even 1 piece if in stock. Custom forgings are handled on a case-by-case basis.
What is your lead time?
Stock items: 3–7 days. Custom orders/forgings: 2–4 weeks. Bulk orders: 4–6 weeks. Expedited options available.
Do you offer custom sizes?
Yes. We offer custom sizes, cut-to-length services, custom forgings, and machined parts based on your drawings or specifications.
What payment methods do you accept?
We accept T/T (30% deposit + 70% balance). Other payment methods (PayPal, Western Union) are negotiable for sample orders.
Do you ship internationally?
Yes. We ship worldwide from Tianjin, China, to North America, Europe, Asia, the Middle East, and other regions.
Do you provide samples?
Yes. Samples are free – the buyer pays freight, and the freight cost will be returned in the future order.
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