Machining Examples

Nickel – Custom Machined Parts

Pure nickel shows excellent corrosion resistance to caustic soda and chlorine gas. Pure nickel also has a melting point of 1433°C, making it highly heat resistant.

Invar is an alloy consisting of 36% nickel and 64% iron. It has a nearly zero coefficient of thermal expansion at room temperature. Because of this characteristic, Invar is named after "Invariable steel". There is also Super Invar, which has a lower coefficient of thermal expansion than Invar.

Kovar is an alloy consisting of 29% nickel, 17% cobalt, and 54% iron. It has a low coefficient of thermal expansion among metals near room temperature. The coefficient of thermal expansion is close to hard glass, so it is mainly used for hard glass sealing. In addition to hard glass, it is also used as a bonding material for ceramic sealing, electronic tubes, and electronic components

Pure Nickel and Nickel Alloy - Properties

Bulk Density
Vickers Hardness
Young’s Modulus
Melting Point
Coefficient of
Thermal Conductivity
Volume Resistivity
Ni 99.0 8.88 0.638 200 1433 12.9
72.7 9.2×10-⁶
Invar Ni 36%
8.12 168 140~150 1426 1.2~2.0 13 75~85×10-⁶
Kovar Ni 29%
8.0~8.3 1.5~1.6 159 1,450 5.2~6.2

Pure Nickel and Nickel Alloy - Key Properties & Popular Applications

Key Properties Applications
Good Corrosion Resistance Pure Ni has high corrosion resistance to alkali and nitrogen gas ・Manufacturing Equipment for Caustic Soda
Magnetic Pure Ni has very high permeability ・Radio wave shield
Low thermal expansion Invar has nearly zero thermal expansion coefficient at room temperature. ・Clock pendulum
・Liquefied natural gas (LNG) tanks and pipes
・CRT shadow mask
Kovar has a thermal expansion coefficient similar to that of hard glass. ・Sealing with glass
・Sealing with ceramics
・Optical communication components
・Vacuum tubes

Available Sizes and Machining Capability

Availability Sizes(mm) Machining Capability Sizes(mm)
Plate 500×800×30 Hole diameter Φ0.03~
Rod Φ100×500 Hole depth ~300
Groove width 0.1 or more Max. hole number ~10,000
Max. Groove(pocket) depth ~100 Thread size M1.2~

Top Seiko Co., Ltd.

1197-4, Hosoe-cho, Nagahama City,
Shiga Pref.,526-0105 Japan
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