Nickel Alloy 200/201 (2.4066/2.4068)

Exceptional purity and dependable corrosion resistance, engineered for precision performance in chemical processing, electronics, and industrial manufacturing.

Nickel Alloy 200/201

Nickel Alloy 200/201 (UNS N02200 / N02201, 2.4066) are commercially pure nickel grades designed to deliver outstanding corrosion resistance, mechanical stability, and high thermal and electrical conductivity. Their primary difference lies in carbon content: Alloy 200 is best suited to applications below 315°C, while Alloy 201 performs better at elevated temperatures due to its resistance to graphitisation.

Both grades excel in caustic, alkaline, and moderately acidic environments. They resist corrosion in media such as sodium hydroxide, neutral salts, dry gases, and organic acids, making them ideal for chemical and electronic applications requiring material purity and stability. With excellent formability, weldability, and non-magnetic properties, these alloys are widely used in chemical processing, food production, electronics, and aerospace systems.

Their high conductivity and low impurity levels also make them ideal for use in sensitive or high-specification environments where contamination, distortion, or material breakdown cannot be tolerated.

AVAILABLE FORMS

Intamet offers 200/201 in a wide range of forms, including the below:

Tubes & Pipes

Fitting & Flanges

Round Bars

Sheet & Plate

FAQs: Nickel Alloy 200/201

What are the Mechanical Properties of Alloy 200/201?

Nickel Alloy 200/201 combines moderate strength with excellent ductility and fabrication flexibility, making it well-suited for formed or welded components in demanding environments.

Typical Mechanical Properties:

Tensile Strength: ~380–420 MPa - Supports reliable load-bearing performance in chemical storage vessels, tanks, and process lines.

Yield Strength: ~105–125 MPa - Allows for cold working and shaping without risk of cracking or permanent deformation.

Elongation at Break: ~45% - Offers excellent ductility for fabrication and high-pressure service where flexibility is needed.

Hardness (Brinell): ~110 HB - Maintains a machinable profile while still providing moderate resistance to wear and surface degradation.

Modulus of Elasticity: ~207 GPa - Delivers solid structural stiffness, useful in precision assemblies and dynamic components.

These properties make Alloy 200/201 a dependable choice for manufacturing systems, electrical connectors, and pressure-rated chemical equipment.

What are the Physical Properties of Nickel Alloy 200/201?

The physical profile of Nickel 200/201 includes high conductivity, stable density, and excellent thermal control, ideal for electrical, thermal, and chemically reactive environments.

Typical Physical Properties:

Density: 8.89 g/cm³ - Supports robust structural integrity without excessive component weight.

Melting Range: 1435–1445 °C - Offers high thermal stability during process heating, sterilisation, or fabrication.

Electrical Conductivity: ~22% IACS - Enables efficient electrical transfer in power systems, battery terminals, and circuit components.

Thermal Conductivity: ~60 W/m·K - Allows effective heat dissipation in thermal exchange systems and conductive assemblies.

Thermal Expansion (20–300°C): ~13.3 µm/m·°C - Provides dimensional reliability under fluctuating temperatures in chemical and electronic systems.

These properties are particularly valuable in electrical systems, vacuum-sealed containers, and environments where predictable expansion and conductivity are critical.

Are there Variants of Nickel Alloy 200/201?

While 200/201 are the two most widely used commercially pure nickel grades, there are related nickel alloys tailored to specific chemical, mechanical, or temperature requirements.

Nickel Alloy 201 (UNS N02201): Lower carbon version of 200 for service above 315°C, offering improved resistance to graphitisation.

Nickel Alloy 270 (UNS N02700): Ultra-pure, low-oxygen grade used in electrical and battery applications requiring extreme conductivity and purity.

Alloy 400 (UNS N04400): Nickel-copper alloy with enhanced strength and corrosion resistance in seawater and mildly acidic environments.

Alloy 600 (UNS N06600): Nickel-chromium alloy designed for high-temperature oxidation and corrosion resistance.

These alternatives allow for material optimisation based on temperature, chemical exposure, strength requirements, or conductivity performance.

What is the Chemical Composition of Alloy 200/201?

Both grades feature ultra-high nickel content with trace alloying elements to enhance corrosion resistance and thermal performance. The lower carbon content in Alloy 201 improves its suitability for high-temperature use.

Typical Composition (%):

Nickel (Ni): ≥ 99.0
The base element providing exceptional corrosion resistance, purity, and conductivity.

Carbon (C):

Alloy 200: ≤ 0.15

Alloy 201: ≤ 0.02
Lower carbon reduces the risk of graphitisation and maintains performance at elevated temperatures.

Iron (Fe): ≤ 0.40
Provides additional structural strength while retaining corrosion resistance.

Manganese (Mn): ≤ 0.35
Aids in deoxidation and fabrication workability.

Silicon (Si): ≤ 0.35
Maintains oxidation resistance during heat exposure.

Sulfur (S): ≤ 0.01
Kept low to maintain ductility and weld quality.

Copper (Cu): ≤ 0.25
Enhances resistance to specific acid attacks and corrosion fatigue.

This chemical profile provides excellent resistance in caustic alkalis, neutral salts, and a range of industrial chemicals, particularly where metal purity is essential.

Where is Alloy 200/201 Used?

Due to their purity, corrosion resistance, and conductivity, Nickel 200/201 are used across industries requiring clean, stable, and reliable materials under pressure, heat, or chemical exposure.

Chemical Processing: Storage vessels, transfer piping, and caustic soda production systems exposed to alkalis or organic acids.

Electronics & Power: Battery components, anodes, electrical terminals, and electromagnetic shielding materials.

Food & Pharmaceutical: Processing equipment, pressure vessels, and storage systems where hygiene and material purity are essential.

Heat Exchangers: Components requiring high conductivity and corrosion stability under flow, pressure, and thermal stress.

Aerospace & Nuclear: Non-magnetic and low-gas-content parts used in specialised mission-critical environments.

Their combination of strength, purity, and corrosion protection makes them indispensable in precision manufacturing, corrosive media handling, and thermal or electrical system integration.

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Nickel Alloy 200/201 (2.4066/2.4068)