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Manufacturing Nickel Iron Precision Alloy Tube Invar36
Invar36, 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).
Invar36 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.
Invar36 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.
| Type | Feature | Usage |
| 4J32,4J36 | Low coefficiency of thermal expension under 20~100°C | Kinds of instrument needs stable sizes; Parts of instrument; Resonance chase. |
| 4J38 | Low coefficiency of thermal expension under 20~100°C Easy to be cut | Kinds of instrument needs stable sizes; Parts of instrument; Resonance chase. |
| 4J40 | Low coefficiency of thermal expension under 20~100°C | Resonance chase of klystrin, microwave tube in electrical vacuum
industry. |
| 4J06,4J47,4J49 | Simlar coefficiency of thermal expension as soft glass’under
certain temperature range | Match with soft glass in electrical vacuum industry. |
| 4J42,4J45,4J50 | Some coefficiency of thermal expension under certain temperature
range
| Match with soft glass and ceramic in electrical vacuum industry. |
| 4J29 | Simlar coefficiency of thermal expension as hard glass’under
certain temperature range | Match with hard glass in electrical vacuum industry. |
| 4J44 | Some coefficiency of thermal expension under 20~500°C | Match with hard glass in electrical vacuum industry. |
| 4J28 | coefficiency of thermal expension under certain temperature range
corrision-resisting | Match with soft glass in electrical vacuum industry. |
| 4J43 | Some coefficiency of thermal expension under 20~400°C |
dumet wire chip |
| 4J33,4J34 | Simlar coefficiency of thermal expension as 95%AI2O3 ceramic’under
-60~+600°C | Match with 95%AI2O3 ceramic in electrical vacuum industry. |
| 4J58 | Some coefficiency of thermal expension under 20~50°C | High-precision Line Scale |
| 4J78,4J80,4J82 | Medium coefficiency of thermal expension under 0~600°C ; No megnetic, corrision-resisting; high strength and tenacity. | Gyro and other ceramic |
