City Special Metals are the UK’s leading stockist and supplier of high performance, specialist alloys including all varieties of Invar 36 (FeNi36).
Available in many forms we can offer a bespoke solution that meets your exact requirements and specification for your Invar 36 application, be it from Plate, Bar, Sheet, Coil or Wire. With over 20 years’ experience, our team has a combined wealth of knowledge about Invar 36 and its different characteristics, so we can guarantee you will find the product that fits your requirements.
For pricing or general advice speak to CSM today on +44 (0) 1268 774 261, email info@cityspecialmetals.com or alternatively complete the contact form below.
Our Products
Invar 36 (FeNi36) is a nickel-iron, low-expansion alloy that exhibits a near-zero rate of thermal expansion and can maintain almost constant dimensions from cryogenic temperatures to 260°C. It has become a popular choice when it comes to composite material manufacturing.
| Product Form | Range From | Range To | |
|---|---|---|---|
 | Invar Plate | 4mm | 400mm |
 | Invar Round Bar | 4mm | 500mm |
 | Invar Square Bar | 70mm | 400mm |
 | Invar Flat Bar | N/A | 250mm x 250mm |
 | Invar Sheet & Coil | 0.025mm | 3.175mm |
 | Invar Wire | 0.15mm | 3.5mm |
Invar 36 Enquiry Form
Beneficial Properties
- Dimensional Stability
Between – 100°C & 260°C - Durability
Strong performance, toughness, and resilience - Near-Zero
Coefficient of linear thermal expansion - Flexibility
Good workability, weldability and easy-to-machine
Applications
- Moulds and lay up tools for composites
- Devices, electrical transformers, and circuit breakers
- Precision equipment elements as such: lasers, measuring and positioning devices, thermostats, precision condenser blades
- High voltage transmission lines
Markets
- Aerospace
- Telecommunications
- Scientific
- Electronic
- Optical Lasers
Invar 36 Chemistry
| Mechanical Properties | ||
|---|---|---|
| Metallurgical Condition | Annealed, Descaled | |
| Yield Strength | KSI (MPa) | 38 (260) Max |
| Tensile Strength | KSI (MPa) | 63 (430) Max |
| Hardness | HB | 135 |
| Elongation | 50mm | >30% (Typical 40%) |
| Co Efficient of Thermal Expansion | ||
|---|---|---|
| 30-350°C | 10-6/°C | 4.8 |
| 30-400°C | 10-6/°C | 7.5 |
| Density | g/cm³ | 8.13 |
| Curie Temp | °F (°C) | 446 230 |
| Melting Point | °F (°C) | 2462 1450 |
| Modulus of Elasticity at 20°C | MPa | 145000 |
| Youngs/Shears Modulus | MPa | 57000 |
| Specific Heat at 20°C | J/g- °C | 0.51 |
| Thermal Conductivity at 20°C | J/cm.s.°C | 0.105 |
| Poisson’s coefficient | 0.25 |
| Technical Specifications | ||
|---|---|---|
| ASTM | UNS | Werkstoff |
| F1684 | K93603 | 1.3912 |
| Chemistry | ||
|---|---|---|
| Nickel | Ni | 35.5 – 36.5 |
| Iron | Fe | Balance |
| Carbon | C | 0.01 max |
| Silicon | Si | 0.2 max |
| Manganese | Mn | 0.2 – 0.4 |
| Sulphur | S | 0.002 max |
| Phosphorus | P | 0.07 max |
| Chromium | Cr | 0.15 max |
| Cobalt | Co | 0.5 max |
Speak to us
We can distribute metals across the globe, including locations in Europe, The Middle East, The Far East and the Americas.
Phone Us
+44 1268 774 261
Speak to the Sales Team
sales@cityspecialmetals.com
Ask Us A Question
info@cityspecialmetals.com
More about Invar
Invar 36 was discovered in 1896, by Charles Edouard Gullaume whilst working with the International Bureau of Weights and Measures. Its unique property of low and linear expansion over a wide temperature range allowed the production of effective bimetal which could be used in safety cut-off devices for gas cookers and heaters. For his work on the nickel-iron system and the discovery of Invar, Charles Edouard Guillaume was awarded a Nobel Prize for Physics early in the 20th century.
If you’d like to know more about Invar 36’s history and legendary status, read our blog article: “Invar – A Legend in Metals” which can be found in our insights area.
Invar is also known by the following trade names;
- Invar ®
- Invar 36 ®
- Pernifer 36®
- Dilaton 36®
- Nilo 36®
- Ametek 936®
- ATI 36®
- NI 36®
- FeNi36
