4J36,invar36bar

Yin Gang (Invar Steel, transliteration), belongs to a kind of iron nickel alloy, the composition ofnickel iron carbon 36%, 63.8%, 0.2%. Characteristics of this kind of material is the biggest with theminimum deformation temperature, suitable for the production of thermal deformation of the strict requirements of the parts.

Invar invar characteristics and similar materials are: steel 35Ni-65Fe,32Ni-64Fe-4Co (Chao Yingang), 37Fe-32Co-11Cr (stainless steel) and amorphous alloy 83Fe-17B. In 1896 the invar by Swiss physicist Charles Edward Guillaume (C. E. Guillaume) first discovered.

Edit this paragraph of basic properties of invar alloy belongs to the iron - nickel alloy, usually32%-36% containing nickel, also contain a small amount of S, P, C and other elements, the other is about 60% Fe, the nickel austenitic elements to expand, so the high nickel austenite to martensitedropped to below room temperature, - 100 to - 120 C, and after annealing, invar alloy at room temperature and room temperature below a certain temperature range, has a face centered cubic lattice structure of austenite microstructure, solid solution is formed in nickel dissolved in gamma -Fe invar alloy, thus has the following properties.

Low expansion coefficient Also called invar invar alloy, the average thermal expansion coefficient is 1.5 * 10-6 DEG C, Ni in the 36% to 1.8 x 10-8 DEG C, and at room temperature - 80 DEG +100 DEG C not change.

The strength and hardness is not high Invar alloy carbon content is less than 0.05%, the hardness and strength is not high, the tensile strength is about 517Mpa, the yield strength is about 276Mpa, the Vivtorinox hardness at around 160, can generally be through cold deformation to improve strength At the same time, the strength is still has a good plasticity.

Yin Gang (5) and low thermal conductivity The coefficient of thermal conductivity of invar alloy is 0.026 - 0.032cal/cm - sec - C, only 45 of the coefficient of thermal conductivity of 1/3-1/4 steel. The plasticity, toughness