What is Incoloy 800? Complete Guide to the Alloy Used in Instant Hot Water Tanks
[2025-10-23] | By Xiamen Smart Water Technology Co., Ltd. Allen Huang
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- Introduction to Incoloy 800
- Composition and Grades (800 / 800H / 800HT)
- Key Properties and Performance
- Applications in Industry
- Why Incoloy 800 is Ideal for Instant Hot Water Tanks
- Comparison with Other Alloys
- FAQs About Incoloy 800
- Partner with Xiamen Smart Water Technology Co., Ltd.
Incoloy 800 is a nickel-iron-chromium alloy developed by INCO in the 1950s. Known for its excellent strength and oxidation resistance at high temperatures, it's a material trusted in petrochemical, power generation, and heating applications.
At Xiamen Smart Water Technology Co., Ltd., every instant hot water tank uses INCO-800 super high-quality heating elements. Paired with a SUS 304 food-grade stainless steel water tank, it guarantees clean, safe, and efficient hot water performance for residential and commercial users.
The Incoloy 800 family includes Incoloy 800, 800H, and 800HT, each with specific mechanical enhancements.
| Grade | Carbon Content | Al + Ti Content | Key Features |
|---|---|---|---|
| Incoloy 800 | ≤0.10% | - | Standard version with balanced performance |
| Incoloy 800H | 0.05–0.10% | - | Improved high-temperature strength |
| Incoloy 800HT | 0.06–0.10% | ≥0.85% | Superior creep and oxidation resistance |
Chemical Composition (ASTM B409 Standard)
| Element | 800 (%) | 800H (%) | 800HT (%) |
|---|---|---|---|
| Ni | 30.0–35.0 | 30.0–35.0 | 30.0–35.0 |
| Cr | 19.0–23.0 | 19.0–23.0 | 19.0–23.0 |
| Fe | Balance | Balance | Balance |
| C | ≤0.10 | 0.05–0.10 | 0.06–0.10 |
| Al + Ti | - | - | ≥0.85 |
Incoloy 800 series stands out due to its balance of heat resistance, strength, and corrosion resistance, making it ideal for heating elements inside instant hot water tanks.
| Property | Specification |
|---|---|
| Density | 7.95 g/cm³ |
| Melting Point | 1350–1400°C |
| Thermal Conductivity (100°C) | 12.5 W/(m·K) |
| Tensile Strength | 520–720 MPa |
| Yield Strength | 210–350 MPa |
| Elongation | 30–45% |
| Max. Operating Temperature | 1150°C (Continuous Use) |
| Oxidation Resistance | Excellent up to 1150°C |
| Creep Strength (800HT @800°C/1000h) | ≥50 MPa |
These properties make Incoloy 800 a perfect material for continuous heating and hot water dispensing systems, where reliability and thermal stability are critical.
| Industry | Typical Application | Benefits |
|---|---|---|
| Petrochemical | Furnace tubes, cracking units | Anti-carburization and oxidation resistance |
| Nuclear Power | Steam generator tubing | Excellent stress corrosion cracking resistance |
| Heat Treatment | Furnace rollers, trays | High-temperature oxidation resistance |
| Energy | Gas turbine components | Outstanding thermal fatigue resistance |
| Consumer Products | Instant hot water tanks | Long lifespan and safety for daily use |
Xiamen Smart Water Technology Co., Ltd. selects Incoloy 800 heating elements for its instant hot water tanks for several reasons:
- Superior Heat Resistance: Maintains performance up to 1150°C without deformation or oxidation.
- Anti-Corrosion Strength: Resistant to scaling, sulfur corrosion, and carbon penetration.
- Longer Lifespan: Performs reliably under repeated heating and cooling cycles.
- Food-Safe Integration: Used with SUS 304 food-grade stainless steel tanks to ensure water purity.
- Stable Energy Efficiency: Delivers consistent hot water without compromising safety or taste.
This combination makes our tanks not just efficient-but built for long-term safety, durability, and comfort.
| Feature | Incoloy 800 | 304H Stainless Steel | Inconel 600 |
|---|---|---|---|
| Max. Operating Temp | 1150°C | 870°C | 1100°C |
| Carburization Resistance | ★★★★ | ★★ | ★★★ |
| Cost Efficiency | ★★★ | ★★★★★ | ★★ |
| Typical Use | Industrial & water heating systems | General stainless use | High-end turbine systems |
Incoloy 800 offers the best balance between performance and cost, making it the preferred material for modern instant hot water dispensers.
Q1: Why is Incoloy 800 used in instant hot water tanks?
Because it withstands high temperatures, resists corrosion, and ensures consistent heat transfer without contamination-ideal for daily hot water systems.
Q2: What's the difference between Incoloy 800, 800H, and 800HT?
They share similar compositions, but 800H and 800HT have better high-temperature strength. 800HT is specifically optimized for creep and oxidation resistance.
Q3: Is Incoloy 800 safe for drinking water systems?
Yes. When paired with food-grade SUS 304 stainless steel, it meets international safety standards for potable water applications.
Q4: How long does an Incoloy 800 heating element last?
Typically, over 10 years under normal operation-thanks to its high thermal and oxidation resistance.
Q5: Can Incoloy 800 be used in other heating devices?
Absolutely. It's widely used in boilers, heat exchangers, and electric heating systems.
Looking for a reliable ODM manufacturer for instant hot water tanks with premium Incoloy 800 heating elements?
👉 Partner with Xiamen Smart Water Technology Co., Ltd. - the trusted OEM/ODM supplier behind many top international under-sink drinking water brands.
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