What is NI-SPANC902?
- August 18, 2024
- 9:41 pm
- 125
NI-SPANC902, also known as Alloy 902 or UNS N09902, is a nickel-iron-chromium alloy with additions of titanium and aluminum that make it precipitation-hardenable. This alloy is known for its controllable thermoelastic coefficient, which is particularly useful in applications requiring high precision and stability over a range of temperatures, such as mechanical resonators, precision springs, and other elastic components. The alloy maintains a constant modulus of elasticity between -50°F to 150°F, making it suitable for use in environments with fluctuating temperatures.
NI-SPAN-C® Alloy 902 is a precipitation hardenable nickel-iron-chromium alloy consisting of iron (49 per cent), nickel (52 per cent) and chromium (5.3 per cent), with trace amounts of titanium (2.5 per cent) and aluminium (0.55 per cent). The alloy is precipitation hardened by the addition of aluminium and titanium and has a controlled thermoelasticity coefficient, which is one of its distinguishing features.
The alloy’s coefficient of thermoelasticity can be controlled by cold working and heat treating temperatures to suit specific applications. It maintains a constant modulus of elasticity over a temperature range of -50°F to +150°F (-46°C to +65°C). This property makes it ideal for use in the manufacture of springs in watches and scales.
In addition, NI-SPAN-C® Alloy 902 has low magnetostrictive properties, making it suitable for applications requiring high precision and stability. It forms a reddish-brown oxide layer under natural conditions, which increases its corrosion resistance. This alloy is widely used for corrosion protection in industrial and marine water environments.
In summary, NI-SPAN-C® Alloy 902 is a high-performance nickel-iron-chromium alloy with a controlled coefficient of thermoelasticity, excellent elasticity, and corrosion resistance, and is used in precision instruments, watches, scales, and other applications where high precision and stability are required.
What is the specific heat treatment process for NI-SPAN-C® Alloy 902?
1.Cold working
- A percentage of the material needs to be cold worked first to increase internal stresses and improve its mechanical properties. Depending on the requirements of the application, the percentage of cold working can be between 30% and 50%.
2.Heat Treatment Temperature Selection
- For most cases, heat treating between 700°F and 750°F (approximately 371°C to 404°C) is recommended to obtain the lowest mechanical hysteresis and the best properties.
- If higher precision and greater tensile strength are required, heat treatment between 1100°F and 1200°F (approximately 593°C to 649°C) with a hold time of 5 hours is an option!
3.Cooling Method
- Proper cooling is required after heat treatment to ensure that the microstructure of the material is stabilised. The specific cooling method should be determined according to actual production conditions and equipment capabilities
4.Specimen testing
- Since different batches of material may exhibit different properties due to differences in composition and manufacturing processes, specimen testing is required for each batch to determine the specific heat treatment parameters required.
advantages of NI-SPANC902
1.Controllable coefficient of thermoelasticity, enabling adaptation to different temperature environments
- The alloy has a controlled coefficient of thermal elasticity. This means that the coefficient of thermal expansion can be adjusted to suit a particular application by controlling the cold working and heat treatment temperatures. This property makes Alloy 902 ideal for precision instruments that require constant frequency over temperature changes, such as vibration systems, tuning forks, springs and precision equipment manufacturing.
This property makes Alloy 902 ideal for precision instruments that require constant frequency over temperature changes, such as vibration systems, tuning forks, springs and precision equipment manufacturing.
2.Low magnetostrictive properties for applications requiring high accuracy and stability
- Alloy 902 has low magnetostrictive properties, which further enhances its suitability for precision applications.
Low magnetostrictive properties mean that the alloy does not deform significantly when subjected to magnetic fields. The low magnetostrictive properties mean that the alloy does not deform significantly when subjected to a magnetic field, which is important for applications requiring high accuracy and stability.
3.Excellent oxidation resistance and high temperature corrosion resistance to ensure long term reliability in harsh environments
- Alloy 902 also exhibits excellent oxidation resistance and high temperature corrosion resistance. This enables it to maintain good mechanical properties and stability in high temperature environments, making it suitable for a number of application scenarios where material durability is of paramount importance.
Ni-Span-C is a type of nickel-iron-chromium alloy known for its unique combination of properties. The most common version is Ni-Span-C 902 (also known as Alloy 902 or UNS N09902), which includes additional elements such as aluminum and titanium. These additions make it precipitation-hardenable and give it a controllable thermoelastic coefficient, meaning it maintains consistent mechanical properties over a wide temperature range. This makes it ideal for use in precision instruments like mechanical resonators, precision springs, and elastic components where stability and accuracy are critical.
In piping, Ni refers to Nickel, an element used as a primary component or alloying element in various types of industrial piping materials. Nickel enhances corrosion resistance, especially in high-temperature and high-pressure environments. For example, nickel-based alloys such as Inconel and Monel are widely used in chemical processing, oil and gas, and power generation industries due to their ability to withstand harsh environments.
Nickel is used in steel to improve several key properties:
- Corrosion Resistance: Nickel enhances the corrosion resistance of steel, making it suitable for harsh environments.
- Toughness and Strength: Nickel increases the toughness and strength of steel, particularly at low temperatures, which is crucial for cryogenic applications.
- Ductility: It also improves the ductility of steel, allowing it to be formed and welded more easily.
- Stability: Nickel-stabilized stainless steels (such as 300-series stainless steels) are known for their stability under a wide range of temperatures.
No, Nickel and Inconel are not the same. Nickel is a pure element, while Inconel is a trademarked family of nickel-based superalloys, primarily made from nickel but also containing significant amounts of chromium, iron, and other elements. Inconel alloys are specifically designed for extreme environments, providing excellent resistance to oxidation, corrosion, and high temperatures. While nickel is a component of Inconel, Inconel’s unique properties come from its complex alloy composition.
Ni refers to Nickel, a versatile metallic element (symbol Ni, atomic number 28) that is widely used in various industries due to its corrosion resistance, high melting point, and ability to alloy with other metals. Nickel is a key material in the production of stainless steel, special alloys (like Inconel, Monel, and Hastelloy), and batteries (particularly in nickel-cadmium and nickel-metal hydride batteries). It is also used in electroplating to provide a protective and decorative finish.
Yes, Nickel (Ni) is considered a heavy metal due to its relatively high atomic weight and density compared to other metals. In environmental and health contexts, heavy metals like nickel can be toxic at certain concentrations, although nickel is also an essential element in small amounts for certain biological processes. Industrial exposure to nickel and its compounds can pose health risks, including skin sensitization and respiratory issues.
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