Differentiation and application of 4J39 and 4J29 low-expansion alloys.
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Invar low expansion alloy is a new type of material with excellent properties, which is widely used in electronics, machinery, instrumentation and other fields. However, there are a variety of grades and specifications of Invar low expansion alloys, among which 4J39 and 4J29 are the two more common grades. This article will detail the differences and applications of these two grades of Invar low expansion alloys.
1. The difference between 4J39 and 4J29.
1.The ingredients are different.
The chemical composition of 4J39 alloy is mainly composed of 39% Ni, 18% CO, 1% Mn and 05% N, while the chemical composition of 4J29 alloy is mainly composed of 29% Ni, 17% CO, 05% mn and 03% AL composition. The main difference between the two alloys is the different content of Ni, Co and Mn, which makes them somewhat different in terms of properties.
2.The coefficient of thermal expansion is different.
The coefficient of thermal expansion of alloy 4J39 is (10.).6~11.4) 10 -6, while the coefficient of thermal expansion of 4J29 alloy is (92~9.8)×10^-6/℃。It can be seen that the coefficient of thermal expansion of alloy 4J39 is slightly higher than that of alloy 4J29, which means that at the same temperature, the dimensional change of alloy 4J39 will be greater.
3.The mechanical properties are different.
The tensile strength of alloy 4J39 is (83 87) kgf mm2, the yield strength is (81 84) kgf mm2, the elongation is (30 35)%, and the section shrinkage is (35 40)%. The tensile strength of 4J29 alloy is (78 82) kgf mm2, the yield strength is (76 79) kgf mm2, the elongation is (30 35)%, and the section shrinkage is (35 40)%. It can be seen that the mechanical properties of alloy 4J39 are slightly higher than those of alloy 4J29.
Second, the field of application.
Due to its excellent characteristics, Invar low expansion alloys are widely used in electronics, machinery, instrumentation and other fields. Among them, the two alloys of 4J39 and 4J29 are no exception. Here are their main areas of application:
1.Electronics.
Invar low expansion alloys have a wide range of applications in the field of electronics, such as manufacturing precision optical instruments, optical fibers, laser parts, etc. These parts need to have a high degree of stability and precision, and the coefficient of thermal expansion and mechanical properties of the Invar low expansion alloy can meet these requirements.
2.Mechanical field.
Invar low expansion alloys are mainly used in the field of machinery to manufacture precision mechanical parts, such as high-precision machine tools, aerospace equipment, etc. These parts need to be highly stable and corrosion-resistant, and the chemical composition and coefficient of thermal expansion of the Invar low expansion alloy can meet these requirements.
3.Instrumentation field.
Invar low expansion alloys have a wide range of applications in the field of instrumentation, such as manufacturing precision instruments, temperature sensors, etc. These parts need to have a high degree of stability and precision, as well as good corrosion and oxidation resistance, and the chemical composition and coefficient of thermal expansion of the Invar low expansion alloy can meet these requirements.
In short, as a new type of material with excellent properties, Invar low expansion alloy is widely used in various fields. Among them, 4J39 and 4J29 alloys have a wide range of application prospects in electronics, machinery, instrumentation and other fields.