Incoloy Alloy

Product Description

Incoloy Alloy refers to a family of nickel-iron-chromium-based superalloys designed to offer exceptional resistance to high temperatures, corrosion, and oxidation. These alloys are widely used in demanding environments, such as chemical processing, power generation, and aerospace industries. Below is a detailed overview of Incoloy alloys, including their composition, properties, applications, and advantages.

 

 

Standards and Specifications

Incoloy alloys comply with international standards, such as:

• ASTM B409: Standard specification for nickel-iron-chromium alloy plate, sheet, and strip.
• ASTM B564: Covers nickel alloy forgings.
• EN 10095: European standard for heat-resistant alloys.
• ASME SB409/SB564: Compliant with ASME boiler and pressure vessel codes.

 

Common Incoloy Alloys

• Incoloy 800/800H/800HT

High nickel and chromium content for excellent oxidation and carburization resistance.

Used in heat-treating furnaces, petrochemical processing, and power generation.

• Incoloy 825

Contains molybdenum and copper for enhanced corrosion resistance.

Ideal for chemical processing, oil and gas, and marine applications.

• Incoloy 925

Precipitation-hardened alloy with high strength and corrosion resistance.

Used in downhole and offshore oil and gas equipment.

• Incoloy 926

High molybdenum content for superior resistance to chloride-induced corrosion.

Suitable for seawater and chemical processing applications.

• Incoloy 625

Contains niobium for high strength and fatigue resistance.

Used in aerospace, marine, and chemical processing industries.

 

Composition

Incoloy alloys typically consist of:

• Nickel (Ni): 30-55% (provides high-temperature strength and corrosion resistance)
• Iron (Fe): 20-50% (enhances mechanical properties and reduces cost)
• Chromium (Cr): 15-23% (improves oxidation and corrosion resistance)
• Molybdenum (Mo): 1-6% (increases resistance to pitting and crevice corrosion)

Other Elements: Small amounts of copper, titanium, aluminum, and niobium for additional strength and stability.

Chemical Composition of commonly used Incoloy alloy

Alloy Grade	C	Fe	Ni	Cr	Al+Ti	Ti	Al	Si	P
800	≤0.1	>39.5	30-35	19-23	0.3-1.2	0.15-0.6	0.15-0.6	≤1.0	≤0.03
800H	0.05-0.10	>39.5	30-35	19-23	0.3-1.2	0.15-0.6	0.15-0.6	≤1.0	≤0.03
800HT	0.06-0.10	>39.5	30-35	19-23	0.85-1.2	0.25-0.6	0.25-0.6	≤1.0	≤0.03
825	≤0.05	Rest	38-46	19.5-23.5	--	0.6-1.2	0.2-1	≤0.05	≤0.03

 

Properties

• High-Temperature Resistance

Maintains strength and stability at elevated temperatures (up to 1200°C or 2200°F).

Resists oxidation and scaling in high-temperature environments.

• Corrosion Resistance

Excellent resistance to a wide range of corrosive media, including acids, alkalis, and chlorides.

Resists pitting, crevice corrosion, and stress corrosion cracking.

• Mechanical Strength

High tensile and yield strength, even under extreme conditions.

Good fatigue resistance and toughness.

• Thermal Stability

Low thermal expansion and high thermal conductivity.

• Ease of Fabrication

Can be machined, welded, and formed using standard techniques.

 

Fabrication and Machining

• Machining: Use carbide tools and slow speeds for optimal results.
• Welding: Compatible with TIG, MIG, and resistance welding techniques.
• Heat Treatment: Solution annealing is recommended to restore corrosion resistance after fabrication.

 

Maintenance and Inspection

Cleaning: Use non-chlorinated solvents to avoid corrosion.

Inspection: Regularly check for signs of wear, corrosion, or deformation.

Storage: Store in a dry, clean environment to prevent contamination.

 

Advantages

• Durability: Long service life in harsh environments.
• Versatility: Suitable for high-temperature and corrosive applications.
• Reliability: Consistent performance under stress.
• Low Maintenance: Resists degradation, reducing downtime and repair costs.

 

Forms and Products

Incoloy alloys are available in various forms, including:

• Sheets and Plates
• Bars and Rods
• Pipes and Tubes
• Wire and Strips
• Forgings and Fasteners

 

Test Equipment

 

Applications

Incoloy alloys are used in industries requiring materials that can withstand extreme conditions, such as:

• Chemical Processing

Reactors, heat exchangers, and piping systems exposed to corrosive chemicals.

• Oil and Gas

Downhole and offshore equipment, valves, and pumps.

• Power Generation

Gas turbines, boilers, and heat exchangers.

• Aerospace

Engine components, exhaust systems, and structural parts.

• Marine Engineering

Components exposed to seawater and marine atmospheres.

• Pollution Control

Flue gas desulfurization systems and scrubbers.

 

Contact Us

For more information, samples, or pricing, feel free to contact us! We are committed to providing high-performance Incoloy Alloy solutions for your advanced applications.

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