Low Expansion 4j36 Alloy Plate Hot Rolled Blackboard Round Rod For Precision

Product Specification

Low expansion 4J36 alloy plate hot-rolled blackboard round rod for precision instruments.

4J36 alloy is a special low expansion iron nickel alloy composed of elements such as iron (Fe), nickel (Ni), cobalt (Co), etc. It has unique physical and chemical properties and is widely used in precision manufacturing, electronic packaging, aerospace and other fields.

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

Mechanical performance
4J36 alloy has high tensile strength and yield strength, ranging from 490 to 680 MPa and ≥ 240 MPa, respectively. Its elongation rate is between 25% and 35%, and its hardness is 130 to 180 HB in the annealed state, and higher at 170 to 200 HB in the cold-rolled state. These excellent mechanical properties enable 4J36 alloy to withstand significant external forces and deformations, thereby maintaining stable performance in various applications.

Heat treatment process
The heat treatment process of 4J36 has a significant impact on its performance, mainly including the following steps:
Homogenization treatment: Heat the alloy to a temperature slightly above its solution line temperature and maintain it for a period of time to ensure uniform distribution of alloy components. This step helps to eliminate segregation and stress that may occur during casting or forging processes.

Rapid cooling: After homogenization treatment, the alloy is rapidly cooled to room temperature or slightly lower to preserve the microstructure of the solid solution. This step is commonly referred to as quenching or rapid cooling.

Aging treatment: In order to obtain the desired properties of the alloy, it is usually necessary to perform aging treatment at a lower temperature. The temperature and time for aging treatment depend on specific application requirements and the composition of the alloy. By aging treatment, the microstructure of the alloy can be adjusted, thereby improving its mechanical properties and stability.

Annealing treatment (optional): In some cases, annealing treatment may be necessary to further reduce the hardness of the alloy and improve its toughness. Annealing treatment usually involves heating at a lower temperature for a long time and then slowly cooling to room temperature.

application area
4J36 alloy has demonstrated extensive application value in multiple fields:

Precision manufacturing: used for manufacturing precision instruments and meters that require precise dimensions to be maintained under temperature changes, such as sensors, standard measuring tools, measuring instruments, etc.
Electronic packaging: Due to its low coefficient of expansion and good weldability, it is commonly used for packaging and connecting electronic components.
Aerospace: In aerospace vehicles, 4J36 alloy can effectively solve the dimensional stability problem caused by temperature changes, ensuring tight connections and stable operation of key components.
Optical instruments: Used in optical instruments, precision measuring instruments, and precision machinery to manufacture various key components such as lens holders, barrels, mirror support frames, etc., to ensure the accuracy and stability of the instruments.

Similar grades of 4J36 include Fe-Ni36 (France), W.Nr.1.3912 (Germany), Ni36 (Germany), X1NiCrMoCu, N 25-20-7 (UK), and UNSK93600 thermostat alloy (USA).
In summary, 4J36, as an expansion alloy with excellent dimensional stability, occupies an important position in the field of materials science. Its unique performance advantages have demonstrated enormous application potential in multiple high-tech fields.