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

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