Invar 36 is a nickel-iron low-expansion alloy that contains 36% nickel. Manan Steels & Metals is a leading Invar 36 Round Bar Manufacturers in India. It has nearly constant dimensions across the normal atmospheric temperature range and a low coefficient of expansion from cryogenic temperatures to about 500°F. At cryogenic temperatures, the alloy retains good strength and toughness.
Invar 36 can be hot and cold formed and machined in the same way that austenitic stainless steels can. Filler Metal CF36, which is available in bare wire for both the GTAW and GMAW processes, can be used to weld Invar 36.
Invar 36 Datasheet
Property
Value
Name
Alloy 36 / Invar 36
Type
Controlled Expansion Alloy
Chemical Sign
FeNi36, 64FeNi
Invar 36 Composition
Substance
Symbol
%
Nickel
Ni
36
Chromium
Cr
0.25
Manganese
Mn
0.50
Silicon
Si
0.25
Carbon
C
0.05
Aluminium
Al
0.10
Magnesium
Mg
0.10
Zirconium
Zr
0.10
Titanium
Ti
0.10
Phosphorus
P
0.020
Sulpur
S
0.020
Iron
Fe
Balance
Invar 36 Thermal Expansion
Range ( °C )
Value (cm/cm. C X 10(-6))
30 to 100
1.18
30 to 200
1.72
30 to 300
4.92
30 to 350
6.60
30 to 400
7.82
30 to 425
n/a
30 to 450
8.82
30 to 500
9.72
30 to 550
n/a
30 to 600
11.35
30 to 700
12.70
30 to 800
13.45
30 to 900
13.85
30 to 1000
n/a
Invar 36 Tensile Strength & Hardness
Property
Tensile Strength (PSI)
Hardness (Rockwell B)
Annealed
85,000 max
70 max
1/4 Hard
90,000 to 115,000
78 to 83
1/2 Hard
105,000 to 125,000
84 to 88
Hard
120,000 min
–
Invar 36 Material Properties
Invar 36 Chemical Composition
Ni
C
Si
Mn
S
35.5 – 36.5
0.01 max
0.2 max
0.2 – 0.4
0.002 max
P
Cr
Co
Fe
0.07 max
0.15 max
0.5 max
Balance
Invar 36 Mechanical Properties
Metallurgical Condition
Annealed, Descaled
Yield Strength
KSI (MPa) 38
(260) Max
Tensile Strength
KSI (MPa) 63
(430) Max
Hardness
HB
135
Elongation
50mm
>30% (Typical 40%)
Application and Features of Invar 36
• Tooling and dies for composite forming • Cryogenic components • Laser components • Readily weldable • Low expansion rate up to 500°F
