Incoloy 800/800H/800HT

Incoloy 800/800H/800HT the chemical composition of these three are very similar, so all have a very good resistance to reduction, oxidation, nitriding medium corrosion and resistance to redox alternating medium corrosion performance, and in the long term application of high temperature has a high metallurgical stability.

Incoloy 800/800H/800HT data sheet

AlloyGB (China)UNS (USA)SEW VDIUV (Germany)BS (UK)AFNOR (France)
Incoloy 800NS111N08800W.Nr. 1.4876, X10NiCrAlTi32-20NA15Z8NC32.21
Incoloy 800HNS112N08810W.Nr. 1.4958, X5 NiCrAlTi 31-20NA 15 (H) 
Incoloy 800HT N08811W.Nr. 1.4959, X8 NiCrAlTi 32-21  


Incoloy _800_800H_800HT

Incoloy 800/800H/800HT Production Standard

However, due to the three (Al + Ti) content is different, resulting in three materials used in different environments, specifically in:

  • Incoloy 800 in sub-zero, room temperature and 600 ℃ high temperature performance will play out.
  • Incoloy 800H due to the (Al + Ti) content is not high sub-0.7%, above 600 ℃ has a good tensile strength.
  • In the 700°C Incoloy 800ht has excellent yield strength above 700°C. It still has good toughness when working for a long time below 700c. Commonly used in hand heat exchangers, bellows expansion joint compensator, electric heaters, steel mills, heat treatment parts, gypsum acetate production and nuclear industry.
AlloyASTM Standards for Seamless Pipe and TubeASTM Standards for Welded Pipe and TubeASTM Standards for Plate, Sheet, and StripASTM Standards for Forging
Incoloy 800ASTM B407/B163ASTM B514/B515ASTM B409 
Incoloy 800HASTM B407/B163ASTM B514/B515ASTM B409 
Incoloy 800HTASTM B407/B163ASTM B514/B515ASTM B409ASTM B564



Incoloy 800/800H/800HT supplier in China——Huaxiao-alloy

Chemical composition of Incoloy 800/800H/800HT(%)

ElementIncoloy 800 (%)Incoloy 800H (%)Incoloy 800HT (%)
Nickel (Ni)30-3530-3530-35
Chromium (Cr)19-2319-2319-23
Iron (Fe)BalanceBalanceBalance
Carbon (C)0.1 max0.05-0.100.06-0.10
Manganese (Mn)1.5 max1.5 max1.5 max
Silicon (Si)1.0 max1.0 max1.0 max
Sulfur (S)0.015 max0.015 max0.015 max
Copper (Cu)0.75 max0.75 max0.75 max
Aluminum (Al)0.15-0.600.15-0.600.25-0.60
Titanium (Ti)0.15-0.600.15-0.600.25-0.60


Incoloy 800/800H/800HT supplier in China——Huaxiao-alloy

Physical properties of Incoloy 800/800H/800HT

PropertyIncoloy 800Incoloy 800HIncoloy 800HT
Density (g/cm³)7.947.947.94
Melting Point (°C)1350-14001350-14001350-1400
Thermal Expansion (µm/m°C)14.4 at 20-100°C14.4 at 20-100°C14.4 at 20-100°C
Thermal Conductivity (W/m·K)11.5 at 20°C11.5 at 20°C11.5 at 20°C
Specific Heat Capacity (J/kg·K)500 at 20°C500 at 20°C500 at 20°C
Electrical Resistivity (µΩ·m)1.0 at 20°C1.0 at 20°C1.0 at 20°C



Mechanical properties of Incoloy 800/800H/800HT

PropertyIncoloy 800Incoloy 800HIncoloy 800HT
Yield Strength (0.2% offset, MPa)170-345205-345205-345
Tensile Strength (MPa)520-810520-870520-870
Elongation (%)30-4530-4530-45
Hardness (Rockwell B)70-8570-8570-85
Creep Strength (MPa at 600°C for 10,000 hours)Varies with specific conditionsVaries with specific conditionsVaries with specific conditions

Incoloy 800/800H/800HT supplier in China——Huaxiao-alloy

Applications of Incoloy 800/800H/800HT

Incoloy 800


  • Heat exchangers in chemical plants: Incoloy 800 is chosen for its excellent resistance to oxidation and carburization at high temperatures, making it ideal for heat exchange systems where organic and inorganic compounds are processed.
  • Power generation: Its strong resistance to oxidation and stability under high-temperature atmospheres make it suitable for superheater and reheat tubes in power plants.
  • Ethylene furnace quench boilers: The alloy’s ability to resist chloride-ion stress-corrosion cracking is beneficial in environments where petrochemical processing involves corrosive compounds.

Incoloy 800H


  • Industrial furnaces: The higher carbon content enhances its creep resistance, making Incoloy 800H ideal for components like furnace parts and fixtures exposed to prolonged high temperatures.
  • Petrochemical processing: This alloy is used in equipment such as crackers and reformers in petrochemical plants due to its enhanced high-temperature strength and resistance to prolonged exposure to aggressive environments.
  • Pressure vessels and heat exchangers: The increased temperature and pressure resistance of 800H make it suitable for high-pressure environments in chemical processing.

Incoloy 800HT


  • Equipment for heat-treating: Incoloy 800HT’s controlled carbon content and increased levels of aluminum and titanium provide excellent resistance to high-temperature corrosion, making it an excellent choice for fixtures and baskets in heat-treating applications.
  • Power generation: Like 800H, 800HT is used in parts of power plants that require high creep resistance, such as in steam methane reforming furnaces for hydrogen production.
  • Chemical processing: Its enhanced properties are beneficial in 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 tailored to meet specific demands of high-temperature environments and corrosive conditions, with modifications in chemical composition focusing on optimizing performance for their intended applications.

FAQs about Incoloy 800/800H/800HT

Incoloy 800H and 800HT are both variants of the basic Incoloy 800 series. The primary difference lies in their chemical compositions that target different mechanical properties:

  • Incoloy 800H has a controlled higher carbon content compared to Incoloy 800, improving its strength and creep resistance at high temperatures. It typically contains around 0.05-0.10% carbon.
  • Incoloy 800HT further enhances the creep resistance by adding more precise controls on aluminum and titanium, typically between 0.25-0.60%, compared to 800H. This change facilitates better performance under high-temperature conditions for extended periods.

Both alloys are designed for high-temperature structural applications, with 800HT offering slightly improved performance in terms of high-temperature strength and resistance to rupture.

The equivalents of Incoloy 800HT include materials that meet the same standards and have similar chemical compositions and mechanical properties. Notably, equivalents can be found in different standard systems like the Werkstoff Nr. 1.4959 or X8 NiCrAlTi 32-21 under German standards, and UNS N08811 under the United States system.

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.

INCOLOY 800H is equivalent to other high-nickel alloys that offer similar high-temperature properties, typically designated under different standard bodies such as Werkstoff Nr. 1.4958 or X5 NiCrAlTi 31-20 in Germany, and UNS N08810 in the United States.

No, Inconel and INCOLOY are not the same, though both are trademarked names for families of nickel-based superalloys.

  • Inconel alloys are generally more focused on high strength and resistance to severe environments, making them suitable for applications in aerospace, marine, and extreme temperature conditions.
  • INCOLOY alloys are optimized for corrosion resistance and heat resistance, making them suitable for chemical, oil, and gas industries.

Incoloy 800H and Incoloy 825 are both corrosion-resistant alloys, but they differ significantly in their composition and the specific environments they are designed for:

  • Incoloy 800H is an iron-nickel-chromium alloy with high strength at elevated temperatures and good resistance to oxidation, carburization, and sulfur-containing atmospheres.
  • Incoloy 825 contains additional elements like molybdenum and copper, which provide enhanced resistance to both reducing and oxidizing acids, stress corrosion cracking, and localized corrosion such as pitting and crevice corrosion.

The choice between the two would depend on the specific environmental conditions and mechanical requirements of the application.


In conclusion, the Incoloy 800 series, including Incoloy 800, 800H, and 800HT, are exemplary alloys characterized by their exceptional resistance to oxidation and corrosion, high strength, and stability under high-temperature conditions. These properties make them ideally suited for challenging industrial applications such as petrochemical processing, power generation, and thermal processing equipment.

At the same time, specialized suppliers like Huaxiao-alloy are dedicated to offering these robust Incoloy alloys, ensuring that industries receive materials of the highest quality tailored to withstand severe environmental conditions. Whether it’s Incoloy 800’s general versatility, 800H’s enhanced creep resistance, or 800HT’s superior structural stability at extreme temperatures, this series stands as a pivotal solution for advanced material requirements in critical industries.

How to choose a Incoloy 800/800H/800HT supplier?

Choosing a supplier for Incoloy 800, 800H, and 800HT involves several important considerations to ensure you receive high-quality materials suitable for your specific industrial needs. Here are key steps and factors to consider when selecting an Incoloy 800/800H/800HT supplier:

1. Supplier Reputation and Experience

  • Industry Presence: Look for suppliers with a strong reputation and a proven track record in the industry. Experience in supplying nickel alloys like Incoloy can indicate reliability and expertise.
  • Client Testimonials: Check for reviews, testimonials, or case studies from other customers. Positive feedback from other businesses in similar sectors can provide insights into the supplier’s reliability and service quality.

2. Quality Assurance

  • Certifications: Ensure that the supplier has relevant certifications such as ISO 9001 for quality management systems. This assures that their operations and products meet international quality standards.
  • Material Testing: Verify if the supplier offers material test reports (MTRs) that confirm the chemical composition and mechanical properties of the alloys. This is crucial for compliance with specific engineering standards and performance under high-temperature conditions.

3. Product Range and Availability

  • Alloy Variants: A supplier that stocks all variants—Incoloy 800, 800H, and 800HT—provides a more comprehensive selection, allowing you to choose the specific alloy that best meets your application’s temperature and strength requirements.
  • Form Factors: Check whether the supplier offers the alloy in various forms such as bars, sheets, pipes, or fittings to suit different applications and manufacturing processes.

4. Technical Support and Customer Service

  • Consultative Sales: Choose suppliers who offer good technical support and can provide detailed advice on which alloy variant is most suitable for your applications. Expert advice on alloy selection can significantly impact the performance and longevity of the material in specific environments.
  • Customer Service: Efficient customer service, including prompt responses to inquiries and logistical support for timely deliveries, is vital for maintaining project timelines.

5. Pricing and Terms of Sale

  • Competitive Pricing: Compare pricing between different suppliers to ensure you are getting competitive rates. However, beware of prices that seem too low as they might indicate subpar material quality.
  • Terms of Sale: Understand the terms of sale, including return policies, warranty conditions, and compliance with trade regulations, which can affect your purchase decision.

6. Global and Local Sourcing Options

  • Global Reach: If your operations are global, consider suppliers with an international presence that can support consistent supply across various regions.
  • Local Suppliers: For quicker turnarounds and potentially lower shipping costs, a local supplier might be advantageous, especially if they meet all other criteria.

Choosing the right Incoloy 800/800H/800HT supplier is crucial for securing high-quality materials that meet your specific requirements and help maintain the integrity and safety of your high-temperature applications.

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