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COEFFICIENT OF LINEAR THERMAL EXPANSION OF IRON AND IRON ALLOYS
Linear thermal expansion coefficients of various iron alloys are given in the following chart.
Linear Thermal Expansion Coefficient Values of Iron and Iron Alloys
Material
Temp.
Coefficient of Thermal Expansion (CTE)
10
-6
(°C)
-1
10
-6
(°F)
-1
Pure Iron
20°C / 68°F
11.7
6.5
Fe-C alloys
0.06% C
20-100°C / 68-212°F
11.7
6.5
0.22% C
11.7
6.5
0.40% C
11.3
6.3
0.56% C
11.0
6.1
1.08% C
10.8
6.0
1.45% C
10.1
5.6
Invar (36% Ni)
20°C / 68°F
2.0
1.1
13Mn - 1.2C
18.0
10.0
13Cr - 0.35C
20-100°C / 68-212°F
10.0
5.6
17.7Cr - 9.6Ni - 0.06C
16.5
9.2
18W - 4Cr - 1V
0-100°C / 32-212°F
11.2
6.2
Gray cast iron
10.5
5.8
Malleable iron (pearlitic)
20-400°C / 68-752°F
12
6.7
Reference:
Davis, J.R.
Metals Handbook Desk Edition
. ASM, 1998.