Incoloy 800H (1.4876)

Q: What are the Mechanical Properties of Incoloy 800H?

Incoloy 800H provides high creep and rupture strength for extended service at elevated temperature. Typical values: tensile strength 500-750 MPa; yield strength (0.2 percent offset) 200-350 MPa; elongation 30-45 percent; hardness 150-200 HB (Brinell); modulus of elasticity approx 196 GPa. Suited to pressure vessels, radiant tubes and high heat containment systems.

Q: What are the Physical Properties of Incoloy 800H?

Typical values: density 7.94 g/cm3; melting range 1357-1385 C; thermal conductivity approx 11.2 W/m K; electrical resistivity approx 1.03 micro-ohm m; thermal expansion approx 14.7 x 10^-6 per K. These support dimensional stability and performance under severe thermal cycling.

Q: Are there Variants or Alternatives to Incoloy 800H?

Variants include Incoloy 800HT (UNS N08811) with tighter control of carbon, aluminium and titanium for improved creep strength, and Incoloy 800 (UNS N08800) for moderate temperatures. Alternatives often considered are Inconel 600 and Inconel 625 where higher nickel or broader corrosion resistance is required. Selection depends on operating temperature, corrosion media and fabrication needs.

Q: What is the Chemical Composition of Incoloy 800H?

Typical composition in percent: Nickel 30.0-35.0; Chromium 19.0-23.0; Iron balance; Carbon 0.05-0.10; Aluminium 0.15-0.60; Titanium 0.15-0.60; Manganese 1.5 max; Silicon 1.0 max; Sulfur 0.015 max. This balance supports resistance to oxidation, carburisation and intergranular corrosion at high temperature.

Q: Where is Incoloy 800H Used?

Common applications: heat exchangers and high temperature piping; furnace components and radiant tubes; petrochemical reformer systems; nuclear and fossil fuel plant tubing; superheaters and boiler components; steam generators and pressure vessels. Selected for thermal strength, oxidation resistance and long term stability.

Reliable high-temperature strength and corrosion resistance, engineered for long-term performance in thermal processing, petrochemical, & power generation environments.

Incoloy 800H

Incoloy 800H is a high-strength, heat-resistant nickel-iron-chromium alloy developed for long-term stability under extreme thermal and mechanical stress. Designated as UNS N08810 or 1.4876, it is specifically engineered for high-temperature industrial systems where structural integrity and corrosion resistance are critical.

Its performance is driven by a carefully controlled composition of nickel, chromium, aluminium, and titanium, balancing oxidation resistance with creep strength. Unlike conventional stainless steels, Incoloy 800H maintains metallurgical stability at service temperatures above 600°C, resisting sensitisation and degradation during prolonged exposure.

The alloy is commonly specified for high-pressure reformers, furnaces, steam generators, and heat exchangers in the petrochemical and power sectors. With proven reliability in oxidising, carburising, and thermal cycling environments, 800H is ideal for infrastructure that demands performance over decades, not just years.

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AVAILABLE FORMS

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Incoloy 800H delivers high creep and rupture strength over extended service periods at elevated temperatures. It is engineered for systems requiring continuous exposure to thermal load, pressure cycling, and corrosive media.

Typical Mechanical Properties:

Tensile Strength: 500–750 MPa - Withstands high mechanical stress in elevated temperature conditions without deformation or failure.

Yield Strength (0.2% offset): 200–350 MPa - Provides stable load resistance and prevents permanent material distortion under thermal pressure.

Elongation: 30–45% - Maintains ductility for fabrication, bending, and cold working without brittleness or cracking.

Hardness (Brinell): ~150–200 HB - Balances wear resistance with ease of machining and thermal forming.

Modulus of Elasticity: ~196 GPa - Delivers reliable stiffness and performance under dynamic or static loading conditions.

These attributes make Incoloy 800H well-suited for pressure vessels, radiant tubes, and high-heat containment systems.

What are the Physical Properties of Incoloy 800H?

The alloy’s physical characteristics ensure dimensional stability and performance under severe operating conditions, especially where temperature fluctuations are common.

Typical Physical Properties:

Density: 7.94 g/cm³ - Supports high mechanical strength without excessive weight in thermal systems.

Melting Range: 1357–1385°C - Offers excellent thermal tolerance for furnace linings, steam systems, and heat treatment chambers.

Thermal Conductivity: ~11.2 W/m·K - Enables stable and predictable heat transfer in high-temperature reactors and exchangers.

Electrical Resistivity: ~1.03 µΩ·m - Provides stable performance in electrically sensitive or high-resistance systems.

Thermal Expansion Coefficient: ~14.7 × 10⁻⁶/K - Maintains structural integrity under thermal cycling without cracking or distortion.

These properties make 800H dependable in both heating elements and pressure-bearing components exposed to aggressive thermal environments.

Are there Variants or Alternatives to Incoloy 800H?

Incoloy 800H is part of the Incoloy 800 series, offering variants tailored to meet specific thermal and mechanical requirements.

Key Variants Include:

Incoloy 800HT (UNS N08811): A higher-performance version of 800H with tighter control of carbon, aluminium, and titanium for superior creep strength. Often used in long-term high-temperature service.

Incoloy 800 (UNS N08800): The original grade in the series. Offers good oxidation resistance and strength at moderate temperatures, but lower carbon content limits high-temperature structural performance.

Common Alternatives:

Inconel 600/625: Higher nickel content provides better resistance to chlorides, oxidation, and stress corrosion in thermal or corrosive systems.

These grades give engineers flexibility based on fabrication requirements, operating temperature, and corrosive media exposure.

What is the Chemical Composition of Incoloy 800H?

Incoloy 800H's elemental composition supports its ability to resist oxidation, carburisation, and intergranular corrosion at high service temperatures.

Typical Composition (%):

Nickel (Ni): 30.0–35.0
Ensures corrosion resistance and prevents embrittlement under heat.

Chromium (Cr): 19.0–23.0
Forms a protective oxide film for scaling and oxidation resistance.

Iron (Fe): Balance
Provides structural support and contributes to strength.

Carbon (C): 0.05–0.10
Controlled for improved creep resistance without sensitisation.

Aluminium (Al): 0.15–0.60
Enhances oxidation resistance and supports high-temperature strength.

Titanium (Ti): 0.15–0.60
Stabilises the alloy structure and aids in preventing intergranular corrosion.

Manganese (Mn): ≤ 1.5
Assists in deoxidation and contributes to hot working properties.

Silicon (Si): ≤ 1.0
Provides additional resistance to oxidation in hot gas environments.

Sulfur (S): ≤ 0.015
Minimised to preserve ductility and weldability.

This alloy balance gives Incoloy 800H its superior performance in extreme thermal and oxidising environments.

Where is Incoloy 800H Used?

Incoloy 800H is trusted across industries where stability, strength, and oxidation resistance are critical at elevated temperatures. Its long-term reliability helps extend service life and reduce downtime in mission-critical equipment.

Heat Exchangers & High-Temperature Piping: Maintains strength and corrosion resistance under continuous thermal cycling.

Furnace Components & Radiant Tubes: Resists oxidation and scaling during prolonged high-temperature exposure.

Petrochemical Reformer Systems: Offers stability in pressure-containing components exposed to steam and hydrocarbon mixtures.

Nuclear & Fossil Fuel Plant Tubing: Provides performance in high-pressure, high-temperature steam and coolant systems.

Superheaters & Boiler Components: Ensures dimensional integrity and strength in high-heat process loops.

Steam Generators & Pressure Vessels: Withstands pressure and heat without embrittlement or failure during long-term service.

Its combination of thermal strength, corrosion resistance, and metallurgical stability makes it a cornerstone material in heavy industrial and power generation applications.

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Incoloy 800H (1.4876)