INCOLOY 800

Incoloy 800 is an iron-nickel-chromium alloy known for its moderate strength and excellent resistance to oxidation and carburization at high temperatures. It is ideal for high-temperature petrochemical applications, as it doesn’t form the embrittling sigma phase at 1200°F (649°C) and resists chloride stress-corrosion cracking. Incoloy 800H offers improved creep and stress-rupture resistance.

Specifications

Designation	Details
UNS Number	N08810, N08811
Werkstoff Nr.	1.4958, 1.4959
ASTM Standards	B 407, B 408, B 409
ASME Standards	SB 407 (Code Case 1325), SB 408, SB 409

Characteristics

Property	Details
Tensile Strength	54.00–77.00 ksi (372–531 MPa)
Yield Strength	13.00–21.00 ksi (90–145 MPa)
Elongation	18.00–23.00%
High Design Stresses	Suitable for ASME Section VIII applications up to 1650°F (899°C)
Oxidation Resistance	Effective up to 1800°F (982°C)
Chloride Stress Corrosion Resistance	Excellent resistance to chloride ion stress corrosion cracking

Standards

ASME

SB-163, SB-407, SB-409

—Seamless Pipes & Tubes—

ASTM

B-163, B-407, B-409

—Sheet, Plate, Rods & Tubes—

SAE AMS

5766, 5871

—High-Performance Applications—

DIN

1.4876

—Material Classification—

AFNOR

Z5 NC 35-20

—French Material Standards—

NACE

MR-01-75

—Corrosion-Resistant Standards—

British Standards (BS)

3072–3076 (NA 15)

—Sheet, Strip, Plate, & Bar—

VdTÜV

412

—German Certification—

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Data Sheet

Chemical Composition

Element	Content (%)
Iron (Fe)	≥39.5
Nickel (Ni)	30–35
Chromium (Cr)	19–23
Manganese (Mn)	≤1.5
Carbon (C)	≤0.1
Silicon (Si)	≤1.0
Sulfur (S)	≤0.015
Copper (Cu)	≤0.75
Aluminum (Al)	0.15–0.60
Titanium (Ti)	0.15–0.60
Others	Remainder

Physical Properties

Property	Value
Density	0.287 lb/in³ (7.94 g/cm³)
Melting Range	2475–2525°F (1357–1385°C)
Thermal Conductivity (Btu-in/ft²-h-°F)	6.7 (at 70°F), 13.8 (at 1400°F), 15.1 (at 1600°F), 17.8 (at 1800°F)
Coefficient of Thermal Expansion	— (at 70°F), 9.9 (at 1400°F), 10.2 (at 1600°F), — (at 1800°F)
Modulus of Elasticity (Dynamic) (psi × 10⁶)	28.5 (at 70°F), 21.1 (at 1400°F), 19.2 (at 1600°F), — (at 1800°F)

Corrosion Resistance

Oxidation Resistance

Incoloy 800 exhibits outstanding resistance to oxidation due to its high chromium content. It forms a stable oxide layer on its surface that protects the material from further oxidation. This makes it suitable for use in environments with high-temperature oxidative conditions.

Sulfur Resistance

The alloy also performs well in the presence of sulfur, especially in applications where exposure to sulfurous gases or liquids is common. It resists sulfidation, a form of corrosion that occurs when sulfur reacts with metals at high temperatures.

Stress Corrosion Cracking Resistance

Incoloy 800 is resistant to stress corrosion cracking in many environments, particularly in high-temperature aqueous solutions. Its resistance to stress corrosion is enhanced by its nickel content, making it suitable for use in environments with high chloride concentrations.

Acid Resistance

Incoloy 800 shows resistance to a range of acidic environments, including those containing nitric acid, phosphoric acid, and acetic acid. The alloy maintains its integrity even when exposed to mildly reducing or oxidizing acid solutions.

Corrosion in High-Temperature Environments

Incoloy 800’s resistance to high-temperature corrosion is particularly notable. It performs well in temperatures ranging from 1000°F (537°C) to 1800°F (982°C). The alloy resists both carburization and oxidation in these elevated temperatures, maintaining strength and durability.

Mechanical Properties(Room Temperature)

Property	Value
Tensile Strength	54,000–77,000 psi (372–531 MPa)
Yield Strength	13,000–21,000 psi (90–145 MPa)
Elongation	18–23%
Hardness	Rb 70–80

Mechanical Properties(Elevated Temperature)

Representative Tensile Properties

Temperature (°F)	Ultimate Tensile Strength (ksi)	0.2% Yield Strength (ksi)	Elongation (%)
70	77.0	29.0	52
1000	63.5	16.5	51
1200	55.7	14.8	50
1400	32.3	14.4	78
1600	18.6	11.6	120
1800	10.2	8.9	120

Typical Creep-Rupture Properties

Temperature (°F)	Minimum Creep (0.001%/hour) Strength (ksi)	10,000 Hour Rupture Strength (ksi)
1400	6.0	7.3
1600	3.6	3.5
1800	1.05	1.2

Welding and Fabrication

Machinability

Incoloy 800 exhibits machinability similar to that of iron-based alloys. However, the material tends to work-harden during machining, so appropriate tools and techniques are required to maintain efficiency.

Welding

Incoloy 800 can be welded using common welding techniques. It is recommended to use a matching filler metal to ensure optimal strength and corrosion resistance in the welded joint.

Forming

The alloy has good ductility, making it suitable for forming using conventional methods. It is easy to shape and mold into desired configurations without compromising its mechanical properties.

Hot Working

Hot working of Incoloy 800 is possible within the temperature range of 871-1232°C (1600-2250°F). This range allows for effective shaping and processing of the material at high temperatures.

Cold Working

Cold working of Incoloy 800 can be done with standard tooling. The alloy retains its strength and integrity when processed at room temperature, making it ideal for forming into various shapes and sizes.

Annealing

After cold working, Incoloy 800 can be annealed at a temperature of 982°C (1800°F) for 15 minutes, followed by air cooling. This process helps restore the material’s optimal properties, including its corrosion resistance and ductility.

Applications

Customized Package

Oil-coated paper wraps our plates, providing protection against corrosion.
Plates are placed on wooden pallets and strapped to secure them, preventing shifting during transportation.

Thick woven plastic bags are used to bundle several bars and rods together.
Each bundle is carefully packed, with the weight not exceeding 1500 KG for safe handling.

Tubes and pipes are packed in air cushion film to shield them from dirt and scratches.
For extra protection, they are placed in wooden cases to prevent damage during transit.

Logistics

At AlloyXpert, sea transportation is the most commonly used method for the majority of our orders and is considered the default shipping mode. Therefore, our quotations are typically based on FOB, CFR, or CIF terms. For customers with urgent requirements, we also offer air transportation as an expedited shipping option. Please feel free to reach out for customized solutions based on your delivery needs.

Related Products

304 Stainless Steel

Incoloy 825

Monel 400

Inconel 625

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