Expansion Alloy Stamping Service

FCE is an expert in providing customers with high-quality, precision tolerance metal parts. With more than 10 years of precision stamping experience in metal stamping and mold, we can provide high-quality expansion alloy stamping services by virtue of our superb technical level, meeting all industry recognized standards. As a company certified by ISO 9001 and IATF 16949, with our rich experience and the latest equipment, We can perform the most complex expansion alloy stamping tasks with unparalleled accuracy.

Properties and applications of expansion alloys

A precision alloy with abnormal thermal expansion characteristics, also known as thermal expansion alloy, is widely used in electronic industry, precision measuring tools, precision instruments, cryogenic engineering and other fields. General metals and alloys expand when heated, and the expansion amount increases linearly with the increase of temperature. However, the thermal expansion curve of some alloys has a bending point at a certain temperature (the intersection of two tangent lines with different slopes). The thermal expansion coefficient below the bending point is much lower than the normal thermal expansion coefficient above the bending point. This phenomenon is called abnormal thermal expansion characteristics.

The expansion alloys mainly include Fe-Ni system, Fe-Ni-Co system and Fe-Ni Cr system alloys. High chromium steel and Co-Fe-Cr system alloys are also used as expansion alloys, but the amount is small. In addition to the specific thermal expansion coefficient, the expansion alloy also requires good sealing, weldability, corrosion resistance, machinability and ease of cutting according to different applications, and no phase change that causes significant changes in expansion characteristics is allowed within the range of service temperature. The chemical composition of expansion alloy must be controlled accurately in the manufacturing process

Classification and application of expansion alloys:

1. Low expansion alloy, or invar alloy, generally has a very small expansion coefficient in the temperature range of – 60~100 ℃, and the average expansion coefficient is less than 3 × 10-6℃-1； It is mainly used to make various instrument elements with stable dimensions, such as precision instruments and optical instruments: elements of precision balance, length scale, geodetic baseline scale, various resonant cavities, waveguides for microwave communication, etc. Common materials such as 4J32, 4J36, 4J38, 4J40, etc. The 4J36 has a low coefficient of thermal expansion and can maintain a fixed length in a wide temperature range

2. Constant expansion alloy or sealing alloy generally has a constant low or medium expansion coefficient in the temperature range of – 70~500 ℃, and the average expansion coefficient is about (4~10) × 10-6℃-1。 They are widely used as leads and structural materials in electronic tubes, transistors and integrated circuits. Common materials such as 4J29, 4J44, etc.

For more than ten years, customers have always believed that we can meet all their requirements for expansion alloy stampings. Please contact us today for more information.