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Super Invar

Super InvarSuper InvarSuper InvarSuper InvarSuper Invar

Product Introduction

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.
Forms: Sheet/Plate, Bar/Rod/Wire/Coil,Capillary/Pipe/Tube

Product details

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.

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.

parameter

Cross Reference

Russia USA Japan France
32HКД Super-invar SI Invar
32HК-BИ Super-Nilvar   Superieur

Typical chemistry

C Si P S Cu Mn Ni Co Fe
0.05 0.20 0.020 0.020 0.40-0.80 0.20-0.60 31.5-33.0 3.20-4.20 Balance

Notes:Under condition that the average coefficient of the linear expansion meets the requirements of the standard, the content of nickel and cobalt are allowed to deviate from the stated range.

Typical Physical Properties

Density lb/cu in 0.294
Specific Gravity   8.15
Curie Temp °F 535
°C 279
  Melting Point °F 4600
°C 1454
Electrical Resistivity Micro-ohm-cm 80
Micro-ohm-c 481.3
  Tensile Strength ksi 70
MPa 483
Yield Strength ksi 40
MPa 276
Elongation % in 2 in. 40

Average Coefficient of Linear Expansion

Heat Treatment of the Samples Mean Coefficient of Linear Expansion
20 to l00℃ 20 to 300℃
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(max)  

Typical Expansion Coefficient

Temp 20--50℃ 0-100℃ 20-200℃ 20-300℃ 20-400℃ 20-500℃
Value 0.7 0.8 1.4 4.3 7.2 9.3

Typical Mechanical Properties

shape Delivery state Thickness&diameter/mm Tensile strengthòь/Mpa Elongationò(%)
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

Size Range

Sheet Thickness:0.10mm~3.50mm, width: ≤300mm
Plate Thickness:3.5mm~40.0mm, width: ≤500mm
Round wire Thickness:0.10mm~5.0mm
Flat Wire Dia 0.5mm~Dia 5.0mm, length≤1000
Rod Dia 5.0mm~Dia 8.0mm, length≤2000
Dia 8.0mm~Dia 32.0mm, length≤2500
Dia 32.0mm~Dia180.0mm, length≤1000
Capillary OD 8.0mm~1.0mm,ID 0.1~8.0 length≤2500
Pipe OD 120mm~8.0mm,ID 8.0~129 length≤4000

Condition: (With max tolerance) cold rolled, cold drawn, hot rolled , hot forging ,peeled turned ,bright ,bright annealed

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