Incoloy 800/800H/800HT
Incoloy alloy 800H: UNS N08810, Material number 1.4876. It is listed in NACE MR0175 for oil and gas service.
Incoloy alloy 800HT: UNS N08811, Material number 1.4958
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Incoloy 800/800H/800HT introduce
Gnee Steel Nickel Based Alloy 800/800H/800HT introduce
800 alloy (N08810) is an iron-nickel-chromium alloy designed as a more economical alternative to nickel-chromium-iron alloys. Nickel and chromium improve its resistance to oxidation, carburization, nitridation, and chlorination. 800 alloy also contains aluminum and titanium, which act as age-hardening components, improving the alloy's resistance to sulfidation and oxidation. However, it should be noted that the aluminum and titanium content is quite low, and alloys with higher aluminum content exhibit significantly better corrosion resistance. This alloy should not be used at temperatures exceeding 650°C.
UNS N08810 / 800H alloy is a variant of 800 alloy with improved high-temperature mechanical properties, allowing its use at temperatures above 650°C.
UNS N08811 / 800HT alloy is an improved version of 800 alloy with higher minimum levels of aluminum and titanium. It features improved high-temperature strength, heat resistance, and creep resistance.
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Common Trade Names:
Incoloy 800 / UNS N08800 / Nickel Alloy 800 / W.Nr 1.4876
Incoloy 800H / UNS N08810 / Nickel Alloy 800H / W.Nr 1.4958
Incoloy 800HT / UNS N08811 / Nickel Alloy 800HT / W.Nr 1.4959
Incoloy 800/800H/800HT Available Shape
Incoloy 800/800H/800HT Alloy Production Standard
Due to the different (Al + Ti) content in the three materials, they are suitable for different environments, as follows:
Incoloy 800 performs well at sub-zero temperatures, room temperature, and high temperatures up to 600℃.
Incoloy 800H, due to its low (Al + Ti) content (less than 0.7%), maintains good tensile strength even above 600℃.
Incoloy 800HT exhibits excellent yield strength at 700℃ and maintains good toughness during prolonged operation below 700℃. It is commonly used in heat exchangers, bellows expansion joints, electric heaters, steel plants, heat treatment components, cellulose acetate production, and the nuclear industry.
| Bar | AMS 5766, ASTM B 408, ASME SB 408, ISO 9723, BS 3076NA15, DIN 17460, EN 10095 |
| Plate | AMS 5871, ASTM A 240/A 480, ASME SA 240/SA 480, ASTM B 409/B 906, ASME SB 409/SB 906, BS 3072NA15, DIN 17460, EN 10028-7, EN 10095 |
| Tube | ASTM B 163, ASME SB 163 (Seamless Condenser & Heat Exchanger Tubes), ASTM B 407/B 829, ASME SB 407/SB 829 (Seamless Tube), ASTM B 515/B 751, ASME SB 515/SB 751 (Welded Tubes), BS 3074NA15 (Seamless Tubes), ISO 6207, DIN 17459 |
| Fittings | ASTM B 366, ASME SB 366 (Fittings) - ASME Code Cases N201 & N254 (All products for nuclear construction), ISO 4955A (General), NACE MR-01-75, AFNOR Z5 NC 35-20, Werkstoff Nr 1.4876, UNS N08810, N08811 |
Overview of Incoloy 800 Series Alloys
Incoloy 800
Incoloy 800 is the base alloy of the Incoloy 800 series. Engineers favor this alloy due to its balanced composition and reliable performance in high-temperature and corrosive environments. The alloy contains 30-35% nickel, 19-23% chromium, and at least 39.5% iron. Trace elements such as aluminum and titanium further enhance its resistance to carburization and oxidation. Incoloy 800 maintains mechanical stability under thermal cycling conditions, making it suitable for heat exchangers and chemical processing equipment. The alloy exhibits excellent tensile strength and yield strength at both room temperature and elevated temperatures, as shown in the table below:
| Temperature (°C) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| 30 | 586 | 255 | 47 |
| 538 | 372 | 172 | 44 |
| 815 | 159 | 69 | 38 |
Incoloy 800H
Incoloy 800H is an alloy developed from its predecessor to meet the demands for higher creep strength and rupture strength at elevated temperatures. This improved alloy features tighter control of carbon content and specific heat treatment requirements. The alloy undergoes solution annealing at a temperature of at least 2050°F (1121°C), resulting in a coarser grain size that enhances its resistance to deformation under prolonged stress. Experimental studies have confirmed the reliability of Incoloy 800H base metal and its welds under cyclic loading and high-temperature fatigue conditions, especially when used in conjunction with advanced filler metals. These characteristics make Incoloy 800H an ideal choice for applications such as petrochemical reforming furnaces and superheater tubes.
Incoloy 800HT
Incoloy 800HT is the most advanced member of the Incoloy 800 series of alloys. This is achieved through tighter control by the manufacturer over the content of carbon, aluminum, and titanium compared to 800H. The alloy is heat-treated at a temperature of at least 2100°F (1149°C), further enhancing its creep resistance and mechanical stability at temperatures up to 925°C. The optimized composition and processing techniques allow Incoloy 800HT to maintain its strength and ductility even after prolonged exposure to extreme high temperatures, making it ideal for use in high-temperature furnace components and heat treatment baskets.
The relationship between Incoloy 800, 800H, and 800HT alloys
Incoloy 800 series alloys share the same basic chemical composition, but differ in the control of key elements and heat treatment processes. The table below summarizes their main differences:
| Aspect | Incoloy 800 | Incoloy 800H | Incoloy 800HT |
|---|---|---|---|
| Carbon Control | Baseline | Tighter | Tightest |
| Al + Ti Control | Standard | Standard | Strictest |
| Heat Treatment | Not required | ≥2050°F (1121°C) | ≥2100°F (1149°C) |
| Grain Size | No requirement | ASTM No.5 or coarser | ASTM No.5 or coarser |
| Creep Resistance | Good | Improved | Highest |
All three alloys meet the same ASTM and UNS standards and are therefore interchangeable in many applications. However, the stricter control over composition and processing of the 800H and 800HT alloys results in superior performance in the most demanding high-temperature environments.
Nickel 800/800H/800HT Alloy Specification
Chemical composition of Incoloy 800/800H/800HT Alloy(%)
| Element | Incoloy 800 (%) | Incoloy 800H (%) | Incoloy 800HT (%) |
|---|---|---|---|
| Nickel (Ni) | 30-35 | 30-35 | 30-35 |
| Chromium (Cr) | 19-23 | 19-23 | 19-23 |
| Iron (Fe) | Balance | Balance | Balance |
| Carbon (C) | 0.1 max | 0.05-0.10 | 0.06-0.10 |
| Manganese (Mn) | 1.5 max | 1.5 max | 1.5 max |
| Silicon (Si) | 1.0 max | 1.0 max | 1.0 max |
| Sulfur (S) | 0.015 max | 0.015 max | 0.015 max |
| Copper (Cu) | 0.75 max | 0.75 max | 0.75 max |
| Aluminum (Al) | 0.15-0.60 | 0.15-0.60 | 0.25-0.60 |
| Titanium (Ti) | 0.15-0.60 | 0.15-0.60 | 0.25-0.60 |
Physical properties of Incoloy 800/800H/800HT Steel
| Property | Incoloy 800 | Incoloy 800H | Incoloy 800HT |
|---|---|---|---|
| Density (g/cm³) | 7.94 | 7.94 | 7.94 |
| Melting Point (°C) | 1350-1400 | 1350-1400 | 1350-1400 |
| Thermal Expansion (µm/m°C) | 14.4 at 20-100°C | 14.4 at 20-100°C | 14.4 at 20-100°C |
| Thermal Conductivity (W/m·K) | 11.5 at 20°C | 11.5 at 20°C | 11.5 at 20°C |
| Specific Heat Capacity (J/kg·K) | 500 at 20°C | 500 at 20°C | 500 at 20°C |
| Electrical Resistivity (µΩ·m) | 1.0 at 20°C | 1.0 at 20°C | 1.0 at 20°C |
Mechanical properties of Alloy 800/800H/800HT
| Property | Incoloy 800 | Incoloy 800H | Incoloy 800HT |
|---|---|---|---|
| Yield Strength (0.2% offset, MPa) | 170-345 | 205-345 | 205-345 |
| Tensile Strength (MPa) | 520-810 | 520-870 | 520-870 |
| Elongation (%) | 30-45 | 30-45 | 30-45 |
| Hardness (Rockwell B) | 70-85 | 70-85 | 70-85 |
| Creep Strength (MPa at 600°C for 10,000 hours) | Varies with specific conditions | Varies with specific conditions | Varies with specific conditions |
Incoloy 800/800H/800HT temperature range
The appropriate material is selected based on the reliable performance of Incoloy 800, 800H, and 800HT within specific temperature ranges. Incoloy 800 performs best in environments up to 650°C. It exhibits good strength and oxidation resistance, making it suitable for heat exchangers and heat treatment equipment. The applicable temperature range of Incoloy 800H extends beyond 650°C. Tests at 760°C show that 800H has excellent fatigue resistance and mechanical stability, making it suitable for high-temperature applications such as superheater tubes and petrochemical reformers. Incoloy 800HT stands out for its ability to operate reliably at temperatures up to 925°C. Its strict compositional control and heat treatment process enable it to withstand prolonged exposure to extreme high temperatures without loss of mechanical properties.
The table below summarizes the recommended operating temperature range:
| Alloy | Recommended Max Temperature | Typical Applications |
|---|---|---|
| Incoloy 800 | Up to 650°C | Heat exchangers, process piping |
| Incoloy 800H | 650°C – 900°C | Superheater tubes, reformer outlets |
| Incoloy 800HT |
Up to 925°C |
Furnace parts, heat-treat baskets |
Applications of Incoloy 800/800H/800HT
Incoloy 800 Applications:
Chemical Plant Heat Exchangers: Incoloy 800 is chosen for its excellent oxidation and carburization resistance at high temperatures, making it an ideal material for heat exchange systems handling organic and inorganic compounds.
Power Generation: Its strong oxidation resistance and stability in high-temperature environments make it suitable for superheater and reheater tubes in power plants.
Ethylene Cracking Furnace Quench Boilers: The alloy's resistance to chloride stress corrosion cracking is advantageous in petrochemical processing environments involving corrosive compounds.
Incoloy 800H Applications:
Industrial Furnaces: The higher carbon content enhances its creep resistance, making Incoloy 800H ideal for components exposed to high temperatures for extended periods, such as furnace parts and fixtures.
Petrochemical Processing: Due to its enhanced high-temperature strength and resistance to long-term exposure to corrosive environments, this alloy is used in equipment such as cracking furnaces and reformers in petrochemical plants.
Pressure Vessels and Heat Exchangers: The improved temperature and pressure resistance of 800H makes it suitable for high-pressure environments in chemical processing.
Incoloy 800HT Applications:
Heat Treatment Equipment: Incoloy 800HT, with its controlled carbon content and increased aluminum and titanium content, offers excellent high-temperature corrosion resistance, making it an excellent choice for fixtures and baskets in heat treatment applications.
Power Generation: Like 800H, 800HT is used in power plants for components requiring high creep resistance, such as steam methane reformers for hydrogen production.
Chemical Processing: Its enhanced properties are beneficial for handling corrosive substances at high temperatures and pressures, making it ideal for applications such as reactor vessels and piping systems in chemical plants.
Each variant of the Incoloy 800 series is specifically designed to meet the unique demands of high-temperature environments and corrosive conditions, with adjustments to its chemical composition aimed at optimizing performance for its intended applications.
Incoloy 800/800H/800HT Packaging
GNEE Group Incoloy 800/800H/800HT Product Packaging
Incoloy 800/800H/800HT Testing
GNEE Group Incoloy 800/800H/800HT Testing
About Gnee Steel
Gnee Steel is a professional manufacturer of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at ss@gneesteel.com to obtain a quotation.
FAQ
Q: What is the difference between Incoloy 800H and 800HT?
A: Incoloy 800H and 800HT are both variants of the Incoloy 800 series of alloys. Their main difference lies in their chemical composition, which dictates their differing mechanical properties: Compared to Incoloy 800, Incoloy 800H has a higher and more tightly controlled carbon content, which improves its strength and creep resistance at high temperatures. It typically contains approximately 0.05-0.10% carbon. Incoloy 800HT further enhances creep resistance through more precise control of aluminum and titanium content (typically 0.25-0.60%). This compositional change results in superior performance under prolonged high-temperature conditions compared to 800H. Both alloys are designed for high-temperature structural applications, with 800HT offering slightly improved high-temperature strength and fracture resistance.
Q: What is equivalent to 800HT material?
A: Equivalent materials for Incoloy 800HT include materials that meet the same standards and have similar chemical composition and mechanical properties. It is worth noting that equivalent materials can be found in different standards systems, such as Werkstoff Nr. 1.4959 or X8 NiCrAlTi 32-21 in the German standard, and UNS N08811 in the American standard.
Q: What is Incoloy 800 material?
A: INCOLOY 800 is a nickel-iron-chromium alloy with good strength and excellent resistance to oxidation and carburization in high-temperature environments. It is primarily used where resistance to corrosion and oxidation is required. The alloy is particularly useful for high-temperature equipment in the petrochemical industry because of its high strength and resistance to chloride-ion-induced stress corrosion cracking.
Q: What is the equivalent of INCOLOY 800H?
A: Incoloy 800H is comparable to other high-nickel alloys with similar high-temperature properties, which are typically designated by different standards organizations, such as the German Werkstoff Nr. 1.4958 or X5 NiCrAlTi 31-20, and the American UNS N08810.
Q: What is the difference between INCOLOY 800H and 825?
A: Both Incoloy 800H and Incoloy 825 are corrosion-resistant alloys, but they have significant differences in composition and applicable environments: Incoloy 800H is an iron-nickel-chromium alloy that exhibits high strength at elevated temperatures and possesses good resistance to oxidation, carburization, and corrosion in sulfur-containing atmospheres. Incoloy 825 contains other elements such as molybdenum and copper, which enhance its resistance to reducing and oxidizing acids, stress corrosion cracking, and localized corrosion such as pitting and crevice corrosion. The choice of alloy depends on the specific environmental conditions and the mechanical properties required for the application.
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