Super Invar®Standard Specification for Low Expansion Alloy
Sheet Thickness:0.1mm~3.5mm
Plate Thickness:3.5mm~40.0mm
Bar Dia 5.0mm~Dia180.0mm
Pipe OD 120mm~8.0mm,ID 8.0~129mm
Wire Dia 0.1mm-Dia5.0mm
Products Application
Optical instruments . Telescopes . Laser instruments and equipment . Ring laser gyroscopes . Laser benches . Positioning devices . Metrology devices . Structural components . Substrates in instrument systems requiring precision measurements, and other applications that require lower expansivity than Invar Alloy provides.
Description
Super Invar ,A low expansion alloy consisting of 32% Nickel, 4% Cobalt, and balance Iron. Super Invar Alloy exhibits minimum thermal expansion at room temperatures (one half of Invar Alloy), as well as thermal expansion properties less than that of Invar Alloy in the 67/203°F (-55/95°C) temperature range. The minimal expansion of Super Invar over this range of temperatures, makes this alloy useful in many applications including structural components and substrates in instrument systems requiring precision measurements.
Parameter
TABLE 1 Cross Reference
Contury Name 2
Russia 32HK 32HK-BΝ
USA Super-invar Super-Nilvar
JAPAN SI
France Invar Superieur
TABLE 2 Chemical Requirement
Element Composition,%
C≤ 0.05
Si≤ 0.20
P≤ 0.020
S≤ 0.020
Mn≤ 0.20-0.60
Cu 0.4-0.80
Co 3.20-4.20
Ni 31.5-33.5
FE remainder
Notes:
1.Under the condition that the average coefficient of the linar expansion meets the requirements of the standard,the content of nickel and cobalt are allowed to deviate from the stated range.
TABLE 3 Physical requirement
Propery Value
Density 0.294 lb/cu in
Specific Gravity 8.15
Curie Temp 535°F
Melting Point 4600°F
Electrical Resistivity 80 Micro-ohm-cm
Tensile Strength 430MPa
Yield Strength 276MPa
Elongation 40 % in 2 in.
TABLE 4 Mechanical Requirement
Shape Delivery state Thickness&diameter/mm Tensile strength sb/PMa Elongationó%
Strip Cold rolled 0.20-2.50 1225 5
Annealed 0.20-1.00 1080 8
Wire Cold Drawn 0.50-5.00 1375 5
Rod Cold Drawn 3.0-18.0 1325 5
Pipe&Flatspring Hot rolled&Hot Forged 6.0-25.0 1080 10
TABLE 5 Coefficient of Linear Expansion
Heat Treatment of the Samples 20-100 °C 20-300 °C
To heat the semi-finished products samples to 840±10°C,
hold for1hour, and quench in the water.
Machine the samples to finished samples.
And heat at 315±10℃ for 1h, furnace or air cool.
1.0
TABLE 6 Coefficient of Linear Expansion
20-50℃ 20-100℃ 20-200℃ 20-300℃ 20-400℃ 20-500℃
0.7 0.8 1.4 4.3 7.2 9.3
Product Detail
Why Us ?
1.Specialized in manufacturing high-precision alloy for 23+ years
2.We can tailoring your unique requirements with ASTM, UNS ,GOST, standards.
3. We can produce more people cannot produce products
4. Good quality control in production process, ISO9001:2008, SGS, CQC, approved.
5. Available in an extensive range of stock or custom size.
6. The whole process from raw material to finished products can be traced.
7. 40000 square meters workshop, advanced facilities and test equipment .
Our Serivce
1. Free Sampe with test report
2.Small Quantity accepted , if we have stocks, we can delivery as small as few kilogram to your specification.
3.Testing services available .
4.Inspection before delivery
5.Response within 24hours
6.Good after service
