Invar36 / Nilvar / Unipsan 36 / Nilo 36 / Vacodil36 Low Expansion Coefficient FeNi36
(Common Name: Invar, FeNi36, Invar Standard, Vacodil36)
4J36 (Invar), also known generically as FeNi36 (64FeNi in the US), is a nickel-iron alloy notable for its uniquely low coefficient of thermal expansion (CTE or α).
4J36 (Invar) is used where high dimensional stability is required, such as precision instruments, clocks, seismic creep gauges, television shadow-mask frames, valves in motors, and antimagnetic watches. In land surveying, when first-order (high-precision) elevation leveling is to be performed, the Level staff (leveling rod) used is made of Invar, instead of wood, fiberglass, or other metals. Invar struts were used in some pistons to limit their thermal expansion inside their cylinders.
4J36 use oxyacetylene welding, electric arc welding, welding and other welding methods. Since the coefficient of expansion and chemical composition of the alloy is related should be avoided due to welding causes a change in the alloy composition, it is preferable to use Argon arc welding welding filler metals preferably contains 0.5% to 1.5% titanium, in order to reduce weld porosity and crack.
Applications: Precision instruments, measuring tapes, weights, etc.
GENERAL PROPERTIES
Specific Gravity: 8.08
Melting Point: 2600 oF
Density: 0.292 lb/in3
Electrical Resistance: 494 ohms/mil/ft
Specific Heat: 0.123 BTU/lb/oF
Thermal Conductivity: 72.6 BTU/ft2/in/oF/hr
Inflection Temperature: 375 oF
Curie Temperature: 530 oF
Specific Gravity: 8.08
Melting Point: 2600 oF
Density: 0.292 lb/in3
Electrical Resistance: 494 ohms/mil/ft
