Invar 36 Alloy - 32% Nickel, Small Expansion Coefficient, Low Thermal Conductivity, Excellent Dimensional Stability

We are engaged in exporting excellent quality Invar 36 Alloy to our valuable clients. Invar alloy belongs to the iron base high nickel alloy, usually containing 32% - 32% nickel, also contains a small amount of S, P, C and other elements, the remaining 60% Fe, because of the ni austenitic elements to expand, so the high nickel make austenite into martensite phase transformation was lowered to below room temperature, 100 ~ 120 a , thus after annealing, invar alloy at room temperature and room temperature under a certain temperature range, have face-centered austenitic lattice structure of organization, nickel is dissolved in gamma - Fe formation of solid solution, so the invar alloy has the following properties:
1, Small expansion coefficient. Invar alloy general expansion coefficient to an average of 1.5 x 10-6 k/nickel from 36% is 1.8 x 10-8 / k and at room temperature to 80 a , 80 a when does not change.
2, Strength and hardness is not high
Very few invar alloy carbon content, hardness and strength is not high, the tensile strength of 517 mpa, yield strength about 276 mpa, the vickers hardness is controlled in 160, general can improve the strength by cold deformation, the strength increased while still have good plasticity.
3, Low thermal conductivity
The coefficient of thermal conductivity of invar alloy is 0.026 ~ 0.032 CAL/cm, the SEC, a , is only 1/3 of the 45 steel - 1/4.