| Customization: | Available |
|---|---|
| Type: | Sheet |
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
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Nickel Alloy 3J22 (UNS K94650), also known by its commercial name Diafex, is a nickel-based alloy that contains 40% cobalt (Co) and a combination of chromium (Cr), molybdenum (Mo), and other elements. This alloy is primarily used for applications requiring high strength, corrosion resistance, and the ability to withstand extreme temperatures.
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance (~50%) |
| Cobalt (Co) | 40 |
| Chromium (Cr) | 14 |
| Molybdenum (Mo) | 4 |
| Iron (Fe) | Trace |
| Carbon (C) | Trace |
| Other Elements | Small amounts of elements like Manganese (Mn), Silicon (Si) |
| Property | Value |
|---|---|
| Density (g/cm³) | ~8.7 |
| Melting Point (°C) | ~1350-1420 |
| Tensile Strength (MPa) | ~550-850 |
| Yield Strength (MPa) | ~350-600 |
| Elongation (%) | ~10-20% |
| Thermal Conductivity (W/m·K) | ~14.0 |
| Coefficient of Thermal Expansion (µm/m·°C) | ~12-14 (20-100°C) |
High Strength and Hardness: Alloy 3J22 is designed for high-temperature and high-stress applications. It maintains excellent strength and hardness at elevated temperatures.
Excellent Corrosion Resistance: The addition of chromium and molybdenum enhances its resistance to corrosion, particularly in oxidizing and acidic environments.
Good Thermal Stability: This alloy can maintain its integrity and strength in high-temperature environments, making it suitable for aerospace and industrial applications that experience thermal cycling.
Magnetic Properties: With a significant cobalt content, 3J22 exhibits magnetic properties, making it useful for certain magnetic applications.
Workability: This alloy is known for its good formability and can be used in the production of complex components, though it requires careful control during processing due to its hardness and high melting point.
Aerospace: Due to its ability to withstand high temperatures and thermal expansion, it is used in the aerospace industry for components that need to perform in extreme conditions.
Electronics: Diafex is employed in electronic components where a combination of high strength and corrosion resistance is needed.
Oil and Gas: The alloy is suitable for use in the oil and gas industry, particularly for corrosive environments or applications in deep wells where high strength and resistance to corrosive media are required.
Chemical Processing: In the chemical industry, 3J22 is used for reactor vessels and valves that need resistance to chemical attack at high temperatures.
Medical Devices: The alloy's biocompatibility, strength, and resistance to corrosion make it useful in certain medical and biomedical devices that require stability in harsh environments.
| 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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