Incoloy 890 Alloy
High-Temperature Oxidation & Sulfidation Resistant Nickel-Iron-Chromium Alloy
Supplied by Huaxiao-Alloy – Your Trusted Global Alloy Partner
Incoloy® 890 Alloy is a high-chromium nickel-iron alloy designed for extreme high-temperature service where oxidation, sulfidation, carburization, and thermal fatigue resistance are critical. With its very high chromium content, Incoloy 890 forms a stable and adherent oxide scale, providing long service life in aggressive furnace and combustion environments.
Huaxiao-Alloy supplies Incoloy 890 Alloy in all product forms, strictly manufactured to ASTM / ASME / UNS standards, supporting industrial furnaces, petrochemical plants, power generation, and heat-treatment equipment worldwide.
1. Incoloy 890 Alloy Overview
Incoloy 890 is specifically engineered for continuous operation at elevated temperatures, outperforming conventional stainless steels such as 310S and 253MA in oxidizing and sulfur-bearing atmospheres. Its alloy design focuses on:
Very high chromium content for oxidation resistance
Nickel-iron matrix for structural stability
Excellent resistance to sulfidation and metal scaling
Good resistance to thermal cycling and spalling
This makes Incoloy 890 ideal for furnace hardware and hot-gas exposure components.
2. Chemical Composition (%)
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 24.0 – 27.0 |
| Nickel (Ni) | 20.0 – 23.0 |
| Iron (Fe) | Balance |
| Carbon (C) | ≤ 0.10 |
| Manganese (Mn) | ≤ 1.50 |
| Silicon (Si) | ≤ 1.50 |
| Sulfur (S) | ≤ 0.015 |
📌 Key Metallurgical Feature
The very high chromium level promotes formation of a dense Cr₂O₃ protective layer, ensuring long-term oxidation and sulfidation resistance at high temperature.
3. Mechanical Properties (Typical, Annealed)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 550 MPa |
| Yield Strength (0.2%) | ≥ 240 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 200 HB |
| Creep Resistance | Good up to 1100°C |
4. Physical Properties
| Property | Value |
|---|---|
| Density | ~7.9 g/cm³ |
| Melting Range | 1370 – 1400°C |
| Thermal Conductivity | ~14 W/m·K |
| Electrical Resistivity | ~0.95 μΩ·m |
| Thermal Expansion (20–1000°C) | ~15.8 μm/m·K |
5. Key Features & Advantages
🔥 Outstanding Oxidation Resistance
Excellent performance in air and combustion gases up to 1100°C.
🛡️ Excellent Sulfidation Resistance
Superior to many stainless steels in sulfur-containing atmospheres.
♨️ High-Temperature Structural Stability
Maintains shape and integrity during long-term exposure and thermal cycling.
🧰 Good Fabricability
Can be formed, machined, and welded using standard nickel-alloy practices.
6. Available Product Forms (Huaxiao-Alloy Supply)
Huaxiao-Alloy supplies Incoloy 890 Alloy in full commercial and custom forms:
Tubular Products
Seamless pipes
Welded pipes
Furnace tubes
Radiant tubes
Flat Products
Plates
Sheets
Coils
Strips
Long Products
Round bars
Square & flat bars
Forged bars
Wire & wire rod
Fabricated Components
Furnace rollers
Trays & baskets
Retorts
Burner components
Custom machined parts
7. Standards & Equivalent Grades
| Standard | Designation |
|---|---|
| UNS | N08890 |
| ASTM | B409 / B407 |
| ASME | SB-409 / SB-407 |
| EN / DIN | Equivalent on request |
| ISO | Heat-resistant nickel alloy |
📄 Certification: EN 10204 3.1 / 3.2, PMI, full traceability available
8. Corrosion & High-Temperature Performance
Incoloy 890 shows excellent resistance to:
High-temperature oxidation
Sulfur-bearing flue gases
Combustion atmospheres
Thermal fatigue & scale spallation
⚠️ It is not intended for strong aqueous corrosion environments; alloy selection support is recommended where liquids are present.
9. Typical Applications
Industrial Furnaces
Radiant tubes
Furnace muffles
Retorts & trays
Burner nozzles
Petrochemical & Refining
Furnace internals
Hot gas ducts
Reforming furnace components
Power Generation
Waste heat recovery systems
High-temperature ducting
Metallurgical Industry
Heat-treatment fixtures
Annealing and sintering equipment
10. Fabrication & Welding Guide
Forming
Hot working: 1100–950°C
Cold working: Good, with intermediate annealing if required
Heat Treatment
Solution annealing: 1050–1150°C, rapid cooling
Welding
GTAW / GMAW / SMAW
Nickel-based filler metals recommended
Preheating not required
11. Quality Control & Certifications
Huaxiao-Alloy ensures:
Chemical composition analysis
Mechanical & hardness testing
Ultrasonic & surface inspection
Dimensional inspection
PMI testing
EN 10204 3.1 / 3.2 certificates
12. Why Choose Huaxiao-Alloy for Incoloy 890?
✔ Direct mill sourcing
✔ Large inventory & fast delivery
✔ Custom sizes & fabrication
✔ Furnace-grade quality control
✔ Export-ready packaging
✔ Technical application support
📍 Factories: Wuxi · Foshan · Shanghai Baoshan
🌍 Export Markets: North America · Europe · Middle East · Southeast Asia
High-temperature furnace and combustion applications.
Incoloy 890 offers better oxidation and sulfidation resistance and longer service life.
Up to 1100°C in oxidizing environments.
Moderate resistance; alloys like Incoloy 803 or 602CA may be better for severe carburization.
Yes, fully customized fabrication is available.
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