Low Expansion Alloy Invar 36 Round Bar 4j36 Precision Alloy Plate For Precision Instrument Components

Low expansion alloy Invar36 round bar 4j36 precision alloy plate for precision instrument components.

4J36 is a special low expansion iron nickel alloy with an ultra-low coefficient of expansion. The control of carbon and manganese components is very important. Cold deformation can reduce the coefficient of thermal expansion, while heat treatment within a specific temperature range can stabilize the coefficient of thermal expansion. 4J36 has corrosion resistance in dry air at room temperature. In other harsh environments, such as humid air, corrosion (rusting) may occur.

Chemical composition and physical properties
The main chemical components of 4J36 alloy include iron, nickel, and cobalt, with nickel content typically ranging from 35.0% to 37.0%, iron as the balance, and cobalt content generally not exceeding 0.5%. In addition, it also contains small amounts of elements such as manganese (Mn), chromium (Cr), silicon (Si), carbon (C), phosphorus (P), and sulfur (S). Within the temperature range of -100 ° C to 200 ° C, its average coefficient of linear expansion is approximately 1.2 x 10 ^ -6/° C, exhibiting extremely low thermal expansion characteristics.

Normal composition%

Typical Physical properties

Physical properties
4J36 alloy has the following notable features:

‌Low expansion coefficient‌: In the temperature range of -100°C to 200°C, its average linear expansion coefficient is about 1.2 x 10^-6 /°C, which allows it to maintain precise dimensional stability under temperature changes‌.
‌High thermal conductivity and electrical conductivity‌: Suitable for the manufacture of high-power electronic components and circuit boards‌.
‌Good magnetic properties‌: Suitable for magnetic sensors and actuators‌.
Processing performance
4J36 alloy performs well in the processing process:

‌Cutting performance‌: Less chips are generated during cutting and easy to discharge, which improves processing efficiency‌.
‌Grinding performance‌: The material structure is uniform, it is not easy to crack or burn during grinding, and the grinding surface quality is high‌.
Mechanical properties
4J36 alloy has the following excellent mechanical properties:

‌High strength‌: The tensile strength is 490 to 680 MPa, and the yield strength is ≥240 MPa‌.
‌Good elongation‌: The elongation is between 25% and 35%. ‌Hardness‌: 130 to 180 HB in the annealed state and 170 to 200 HB in the cold rolled state. ‌Corrosion resistance‌: It has good oxidation and corrosion resistance, especially stable in humid environments. ‌Application areas ‌4J36 alloy is widely used in many fields due to its excellent performance: ‌Electronic packaging‌: It has good matching with materials such as glass and ceramics, and is used for integrated circuit packaging, vacuum tube shells, optoelectronic device packaging, etc. ‌Precision manufacturing‌: It is used to manufacture precision instruments and meters that need to maintain precise dimensions under temperature changes, such as sensors, standard gauges, measuring instruments, etc. ‌Aerospace‌: It is used to manufacture aircraft engines and missile components to ensure stability in extreme environments.

corrosion prevention
4J36 alloy has corrosion resistance in dry air at room temperature. However, in humid or harsh environments, its corrosion resistance may decrease, so additional protective measures need to be taken, such as coating with anti rust paint or passivation treatment.
Welding performance
4J36 alloy can be welded using all welding processes, including tungsten electrode welding, metal arc welding, plasma welding, argon arc welding, manual arc welding, etc. Before welding, the material should be in an annealed state, clean, free of oil stains, scratches, marking paint, etc. Low heat input must be used, and the interlayer temperature should be below 120 ℃. No pre weld and post weld heat treatment is required. If the weld performance is designed to be the same as the base metal, it is necessary to use welding rods of the same material as the base metal.
summary
4J36 (Kovar alloy wire), as a metal alloy material with unique properties, has been widely used in various fields such as aerospace, electronic communication, and precision instruments. Its excellent performance and wide application prospects make it play an important role in the field of metal materials. In the future, with the continuous optimization of preparation processes and the continuous improvement of performance, 4J36 alloy will be applied in more fields and provide strong support for the development of related industries.

• stainless steel series 304, 304L, 321, 316L, 317L, 309s, 310s,904L,410, 420, 430, 441, 409, 436, 441, 439, 630,etc.
• Duplex stainless steel series 2205, 2507​,etc.
• HastelloyC-276, B-2, C-2000,etc.
• Nickel-based alloy series Inconel625, 718, Incoloy825, 800H, Monel400,etc.
• Superalloy series GH4169, GH3625,GH3030,GH3044,GH2747,GH3128,GH4145,GH230,GH163, etc.
• Soft magnetic alloy series 1j85, 4J36 4J29 4J33 1J50 1J22 1J85, etc.
• Copper-nickel alloy series NCu40-2-1 plates, tubes, bars, profiles and forgings.

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