Customization: | Available |
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Type: | Sheet |
Standard: | AISI, ASTM, DIN, JIS, GB, BS |
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Nickel alloy FeNi42 (also known as Feni42, Ns42, 4J143, 4J44, Feni44) is a nickel-iron alloy known for its excellent properties in precision applications, particularly where low expansion and high thermal stability are critical. It is commonly used in industries that require materials that can handle various thermal stresses and mechanical loads, with minimal dimensional changes over a wide range of temperatures.
Element | Content (% by weight) |
---|---|
Nickel (Ni) | 42 |
Iron (Fe) | Balance (~58%) |
Chromium (Cr) | Trace |
Silicon (Si) | Trace |
Manganese (Mn) | Trace |
Property | FeNi42 (Feni42, Ns42, 4J143, 4J44) |
---|---|
Density (g/cm³) | ~8.2 |
Melting Point (°C) | ~1350 |
Coefficient of Thermal Expansion (µm/m·°C) | ~4.2 (10-100°C) |
Electrical Resistivity (µΩ·cm) | ~0.5-0.6 |
Tensile Strength (MPa) | ~550-700 |
Yield Strength (MPa) | ~250-350 |
Thermal Conductivity (W/m·K) | ~20 |
Low Thermal Expansion: One of the key features of FeNi42 is its low coefficient of thermal expansion, which allows it to maintain dimensional stability even with significant temperature changes. This property is highly valued in precision engineering and instruments.
Thermal Stability: This alloy performs well at high temperatures, maintaining its structural integrity and strength in high-heat applications, which makes it a good choice for thermally stressed components.
Good Electrical Properties: Due to its nickel content, FeNi42 offers good electrical resistivity, making it suitable for electrical components, contacts, and other parts that require stable electrical performance.
Corrosion Resistance: While not as resistant as other nickel alloys, FeNi42 offers moderate corrosion resistance, especially in environments not exposed to aggressive chemicals.
Workability: FeNi42 is relatively easy to form, weld, and machine compared to other high-performance alloys, allowing for easy processing into sheets, strips, foils, and coils.
Precision Instruments: FeNi42 is used in precision measurement equipment and thermometers, where dimensional stability is crucial over temperature fluctuations.
Electronics: Components like electrical contacts, relays, and switches, where the material must exhibit low expansion with high conductivity.
Aerospace: In aerospace applications where components must endure extreme temperature changes and maintain structural integrity.
Thermal Management: Used in heat exchangers and components subjected to thermal cycling due to its stability in varying temperature conditions.
Clocks and Watches: FeNi42 is employed in mechanical watches and timepieces for parts like springs, as it maintains size and shape despite temperature changes.
Welding Electrodes: Used in welding electrodes for welding other materials that need to withstand high temperatures.
Property | Precision Alloy Steel Sheets | |
Material Composition | Similar to strips, precision alloy sheets are made from carefully controlled compositions, often with low expansion coefficients or specialized magnetic properties, such as Invar or Mu-metal. | |
Thickness | Precision alloy sheets are thicker than strips, typically ranging from 0.5 mm to several millimeters, depending on mechanical and thermal property requirements. | |
Applications | Commonly used in industries such as aerospace, electronics, and medical devices for components like structural parts, enclosures, and sensitive instrumentation that require controlled mechanical properties and dimensional accuracy. | |
Mechanical Properties | High tensile strength, excellent flatness, and precision in dimensions. These sheets offer stable mechanical properties under both high and low temperature conditions. | |
Thermal Properties | Similar to strips, these sheets are designed for specific thermal behaviors, such as low expansion or high-temperature stability, depending on the alloy (e.g., Invar, Mu-metal). | |
Electrical Properties | Precision alloys in sheet form may also have controlled electrical resistance, especially for applications in sensitive electronics or electrical components. | |
Magnetic Properties | Similar to strips, magnetic alloys like Mu-metal sheets are used for shielding in sensitive equipment to control or eliminate external magnetic interference. | |
Forming & Fabrication | Precision alloy sheets can be cold-rolled, heat-treated, laser-cut, or stamped. They are suitable for both complex shapes and applications requiring high dimensional tolerance and material consistency. | |
Heat Treatment | Heat treatments like solution annealing or stress-relief are common for precision alloy sheets to improve properties such as strength, stability, and resistance to thermal expansion. | |
Welding & Joining | Precision alloy sheets can be welded or brazed, although welding requires careful control of heat to avoid compromising the alloy's properties. | |
Examples of Alloys | Invar, Mu-metal, Kovar, Constantan, Permalloy | |
Cost | Precision alloy sheets are also expensive, as they require precise manufacturing and composition control. Their cost is higher than standard steel or non-precision alloys. | |
Common Standards | ASTM A-240, ASTM B-637, ASTM B-553, AMS 5525 |
1: What is precision alloy?
Precision alloys refer to special alloys with high purity, uniformity and stability. They are usually used to manufacture parts or components that have extremely strict size, shape and performance requirements. They have special physical properties (such as magnetic, electrical, thermal, etc.) and chemical properties to meet specific engineering requirements.
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