AMS l-23011 CL7MIL l-23011 CL7UNS K93602/03
4J36 (China), Fe-Ni36 (France), 1.3912, Ni36 (Germany), X1NiCrMoCu, N 25-20-7 (UK) Invar 36, UNSK93600 thermostat alloy, UNSK93601 pressure vessel sheet (USA)
Alloy 36 (Invar) / K93603 / ASTM F1684 Widely known under several trades names such as Invar* and Nilo 36**, this grade is a 36% nickel-iron alloy. It exhibits a near zero rate of thermal expansion from around 100oC up to 200oC. This is around a tenth of the expansion rate of carbon steels. Alloy 36 also demonstrates a high retention of strength and toughness at cryogenic temperatures, making it suitable for a variety of low temperature or low expansion applications.
The alloy is ideally suited to areas where dimensional changes due to temperature must be minimal, such as tooling for aerospace composites, radio and electronic devices and structural members in precision equipment such as lasers, measuring devices, thermostats and cryogenic instrumentation. Alloy 36 can also be utilised in combination with a high expansion material to crate mechanical movement with temperature in thermomechanical controls and switchgear.
| Russia |
USA |
England |
Japan |
Franch |
Germany |
| 36H |
Invar 36 |
Cactus LE |
Invar Standard |
Vacodil36 |
Nilo36 |
Content Composition %
| C |
Si |
P |
S |
Mn |
Ni |
Fe |
| Less than% |
| 0.05 |
0.30 |
0.020 |
0.020 |
0.20-0.60 |
35.0-37.0 |
Rest |
Average linear expansion coefficient
| Sample heat treatment system |
/(10-6/℃) |
| 20-100℃ |
20-300℃ |
| The semi-finished sample is heated to 840C10C, kept for 1 h, water quenched, and then the sample is processed into a finished sample, which is kept at 315C10C for 1 h with furnace cooling or air cooling. |
≤1.5 |
--- |
| Type |
Size/mm |
Deliver State |
| Bar |
5.0-8.0 |
Cold Drawn |
| 8.0-30.0 |
Hot rolling |
| 30.0-180.0 |
Hot forging |
| Plate |
3.5-30.0 |
Hot rolling |
| 30.0-40.0 |
Hot forging |
| Strip |
0.2-3.5 |
Cold rolling |
| Flat wire |
0.5-5.0 |
Hot rolling |
| Round wire |
0.1-5.0 |
Cold Drawn |
| Capillary |
OD8.0-1.0ID0.1-8.0 |
Cold Drawn |
| Pipe |
OD120-8.0, ID8.0-129 |
Cold drawn |
Invar 36 is used in environments that require very low expansion coefficients.
