Invar® / Super Invar®

About Invar® and Super-Invar® Alloys

Invar® is made up of 64% iron and 36% nickel. Invar is known for its excellent properties of controlled coefficient of thermal expansion. Invar® end uses include glass sealing, clocks, laboratory devices, creep gauges, shadow-mask frames and valves in motors. Invar® (36% NI-Balance Iron) Alloy has been the high temp metal of choice for low expansion applications for years.

“Super-Invar®” (31% NI-5% Co-Balance Iron) has found some favor because it has a near zero coefficient of thermal expansion over a limited temperature range. The useful range of “Super Invar®” is limited to between -32° to + 275°C. because the material begins to transform from Austenite to Martinsite at temperature below-32°F Invar and Super Invar® are iron-nickel alloys that are known and named for their resistance to thermal expansion. This steady, resistant shape in all temperatures makes them an ideal material for delicate measuring instruments, clocks, watches, communication devices and other sensitive machines. Eagle Alloys supplies Invar® and Super Invar® rods, coils, sheets and plates in various sizes and thicknesses to suit a wide array of applications.

Invar® alloy is also available in a second variation know as Free-Cut (FC) Invar 36® or Free-Machining (FM) (UNS K93050 per ASTM-F-1684).  A small amount of selenium is added to enhance machinability for high productivity applications. Eagle Alloys supplies dozens of metals for machining, manufacturing and finishing thousands of products. All of our metals adhere to strict quality standards to ensure that your finished products, tools and equipment exceed your expectations. Top-quality parts, components and products begin with the best materials, especially when dealing with sensitive measuring instruments and delicate devices. We produce Invar and Super Invar according to your needs and specifications to build a product you can count on.

Invar Trademark Imphy Alloys, France Invar 36 Trademark Carpenter Technology Corp., Reading PA Pernifer 36 Trademark ThyseenKrupp-VDM, Germany NILO 36 Trademark Special Metals Corporation, USA

Above data is for informational purposes only.  Eagle Alloys is not liable for accuracy of these contents or applications. Finished part drawings may be forwarded to a third party for outsourcing.