High Temprature Alloys

Invar, also known generically as FeNi36 (64FeNi in the US), is a nickel steel alloy notable for its uniquely low coefficient of thermal expansion (CTE or α). It was invented in 1896 by Swiss scientist Charles Édouard Guillaume. He received the Nobel Prize in Physics in 1920 for this discovery, which shows the importance of this alloy in scientific instruments. "Invar" is a registered trademark of ArcelorMittal - Stainless & Nickel Alloys, formerly known as Imphy Alloys (US Trademark #63970), however FeNi36 is also manufactured by Japanese companies. Like other nickel/iron compositions, Invar is a solid solution; that is, it is a single-phase alloy — similar to a dilution of common table salt mixed into water. The name "Invar" comes from the word invariable, referring to its lack of expansion or contraction with temperature changes.

Kovar are vital parts of the reusable metal industry. These are typically composed of:

• 53 % iron
• 29 % nickel
• 17 % cobalt
• 0.3 % manganese
• and 0.2 % silicon

Kovar is vacuum melted, low expansion, iron/nickel/cobalt alloy that has a chemical composition which is controlled within relatively narrow margins to insure uniform thermal expansion properties. Kovar can be found in flat and solid mill shapes including kovar sheet, kovar rod, kovar round bar, kovar tube, kovar strip, and kovar wire.

We are engaged in offering Tungsten that is used for various applications in industries like engineering, electrical, transport and heavy industries. The scrap is recycled to use in high temperature situations in electrical and electronics industries. This is combined with another scrap to form super alloys. The extreme hardness of tungsten is useful in the production of knives that maintains excellent edge even after extensive use.

We manufacture and offer ferro molybdenum that is an alloying addition which sharply raises the mechanical and physical properties of steels. Addition of molybdenum ensures uniform micro-crystalline structure in steel, augments its hardening ability and eliminates post-temper brittleness.

Alloy 42 is a nickel iron alloy whose coefficient of expansion makes it suitable for joining to ceramic chips in miniature electronic circuits.

Physical Properties
Specific gravity	8.12
Density, lbs. per cu. in.	0.29
Electrical resistivity, micro-ohm-cm	72

Mu-metal is a nickel-iron alloy (approximately 75% nickel, 15% iron, plus copper and molybdenum) that has very high magnetic permeability. The high permeability makes mu-metal very effective at screening static or low-frequency magnetic fields, which cannot be attenuated by other methods. The name came from the Greek letter mu (μ) which represents permeability.

Mu-metal can have relative permeabilities of 80,000-100,000 compared to several thousand for ordinary steel. In addition it has low coercivity and magnetostriction resulting in low hysteresis loss. Its magnetic properties are similar to other high permeability alloys such as Permalloy, but it is more ductile and workable.