Low Expansion Alloy Wire Invar 36 Wire 310 MPa Yield Strength

Low Expansion Alloy Wire Invar 36 Wire 310 MPa Yield strength With Good Mechanical Properties

Product Introduction

Invar 36 Wire is a low-expansion alloy wire composed of 64% iron and 36% nickel, featuring an extremely low coefficient of linear expansion, close to zero. This means that it hardly contracts or expands with temperature changes. This characteristic makes it very useful in fields such as precision instruments, aerospace, electronics, and communication equipment where high dimensional stability is required. Invar 36 Wire also has good mechanical properties, including high strength and excellent tensile performance, as well as good machinability, and it can be welded using various welding processes. Its density is 8.1 g/cm³, the melting temperature range is 1430℃, and the Curie temperature is 230℃. Applications of Invar 36 Wire include the production, storage, and transportation of liquefied gas, measuring and control instruments operating at temperatures below 200℃, spiral connectors and bushings between metals and other materials, bimetallic and temperature-controlled bimetallic materials, diaphragm frames, shadow masks, tempering molds for CRP components in the aviation industry, and frames for electronic control units in satellites and missiles operating below -200℃, etc.

Parameter

Specific Applications

1. Optical instruments: Invar 36 Wire is used to manufacture precision components in optical instruments, such as telescope mirror frames, microscope stands, and support structures for optical systems, ensuring dimensional stability with temperature changes to maintain the precise alignment of the optical system.
2. Precision measuring equipment: In precision measuring devices, such as length scales and geodetic baseline rulers, the low coefficient of thermal expansion of Invar 36 Wire ensures high precision and stability of measurements.
3. Astronomical instruments: It is used to manufacture support systems and large lens support structures for astronomical telescopes, ensuring dimensional stability under different temperature conditions to improve observation accuracy.
4. Electronic devices: In electronic devices, such as semiconductor manufacturing equipment and communication devices, Invar 36 Wire is used to manufacture components that need to maintain dimensional stability with temperature changes, such as shadow masks and diaphragm frames.

Advantages and Characteristics

• Low coefficient of thermal expansion: Invar 36 Wire has an extremely low coefficient of linear expansion at room temperature, approximately 1.2×10⁻⁶/℃. Within the working temperature range of -200℃ to +200℃, the thermal expansion coefficient is very low, with almost no dimensional change.
• Good mechanical properties: Invar 36 Wire has high strength and good ductility, with a tensile strength typically ranging from 490 to 690 MPa and a yield strength between 240 and 345 MPa, capable of withstanding high stress and loads.
• Excellent machinability: Invar 36 Wire has good machinability and formability, and can be processed through conventional metallurgical processes such as cold working and welding, facilitating the manufacture of complex-shaped components.
• Good corrosion resistance: In a dry room temperature environment, Invar 36 Wire has good corrosion resistance. However, it may rust in humid environments, so protective measures should be taken during use.

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Q&A

What is Invar 36? Invar 36 is a special low-expansion iron-nickel alloy, mainly composed of 36% nickel and 64% iron, with an extremely low coefficient of thermal expansion.

What is the chemical composition of Invar 36? The chemical composition of Invar 36 includes 35%-37% nickel, the remainder being iron, along with small amounts of carbon (≤0.03%), manganese (≤0.35%), silicon (≤0.2%), cobalt (≤0.5%), phosphorus (≤0.02%), and sulfur (≤0.01%).

What are the physical properties of Invar 36? Invar 36 has a density of 8.1 g/cm³, a melting point of approximately 1430℃, a Curie temperature of 230℃, and a thermal conductivity of about 10.5 W/(m·K).

What are the mechanical properties of Invar 36? Invar 36 has a tensile strength of 490 MPa, a yield strength of 240 MPa, an elongation of 42%, and a Brinell hardness of ≤200.

What is the coefficient of thermal expansion of Invar 36? Invar 36 has an extremely low coefficient of thermal expansion, approximately 1.2×10^-6/℃, within the temperature range of -250℃ to +200℃.