LINEAR THERMAL EXPANSION COEFFICIENT FOR METALS


Linear thermal expansion coefficients of metals including aluminum, steel, bronze, iron, brass, copper, gold, silver, invar, magnesium, nickel, titanium and zinc are given in the following thermal expansion coefficients chart. These linear thermal expansion coefficients are room temperature values of metals.

Linear thermal expansion coefficient is defined as material's fractional change in length divided by the change in temperature. Coefficient of linear thermal expansion is designated by the symbol α (alpha). The SI unit of thermal expansion coefficient is (°C)-1 and U.S. customary unit is (°F)-1.

Room Temperature Linear Thermal Expansion Coefficient Values for Metals
 Aluminum Alloys
Material Coefficient of Thermal Expansion
10-6 (°C)-1 10-6 (°F)-1
Aluminum Alloy 1100 23.6 13.1
Aluminum Alloy 2011 23.0 12.8
Aluminum Alloy 2024 22.9 12.7
Aluminum Alloy 5086 23.8 13.2
 Aluminum Alloy 6061 23.6 13.1
 Aluminum Alloy 7075 23.4 13.0
Aluminum Alloy 356.0 21.5 11.9
Copper-Base Alloys
Material Coefficient of Thermal Expansion
10-6 (°C)-1 10-6 (°F)-1
Copper Alloy C11000 (electrolytic tough pitch) 17.0 9.4
Copper Alloy C17200 (beryllium - copper) 16.7 9.3
Copper Alloy C22000 (Commercial bronze, 90%) 18.4 10.2
Copper Alloy C23000 (Red brass, 85 %) 18.7 10.4
Copper Alloy C26000 (cartridge brass) 19.9 11.1
Copper Alloy C27000 (Yellow Brass) 20.3 11.3
Copper Alloy C36000 (free - cutting brass) 20.5 11.4
Copper Alloy C51000 (Phosphor bronze, 5% A) 17.8 9.9
Copper Alloy C62300 (Aluminum bronze, 9%) 16.2 9.0
Copper Alloy C71500 (copper - nickel, 30%) 16.2 9.0
Copper Alloy C93200 (bearing bronze) 18.0 10.0
 Cast Irons
Material Coefficient of Thermal Expansion
10-6 (°C)-1 10-6 (°F)-1
Gray Irons
Grade G1800 11.4 6.3
Grade G3000 11.4 6.3
Grade G4000 11.4 6.3
Ductile Irons
Grade 60-40-18 11.2 6.2
Grade 80-55-06 10.6 5.9
Precious Metals
Material Coefficient of Thermal Expansion
10-6 (°C)-1 10-6 (°F)-1
Gold (commercially pure) 14.2 7.9
Silver (commercially pure) 19.7 10.9
Steels
Material Coefficient of Thermal Expansion
10-6 (°C)-1 10-6 (°F)-1
Plain Carbon and Low Alloy Steels
Steel Alloy A36 11.7 6.5
Steel Alloy 1020 11.7 6.5
Steel Alloy 1040 11.3 6.3
Steel Alloy 4140 12.3 6.8
Steel Alloy 4340 12.3 6.8
Stainless Steels
Stainless Alloy 304 17.2 9.6
Stainless Alloy 316 15.9 8.8
Stainless Alloy 405 10.8 6.0
Stainless Alloy 440A 10.2 5.7
Stainless Alloy 17-7PH 11.0 6.1
Titanium Alloys
Material Coefficient of Thermal Expansion
10-6 (°C)-1 10-6 (°F)-1
Commercially Pure (ASTM Grade 1) 8.6 4.8
Titanium Alloy Ti - 5Al - 2.5Sn 9.4 5.2
Titanium Alloy Ti - 6Al - 4V 8.6 4.8
Titanium Alloy Ti-8Mn 10.8 6.0
Various Metals
Material Coefficient of Thermal Expansion
10-6 (°C)-1 10-6 (°F)-1
Magnesium Alloy AZ31B 26.0 14.4
Nickel 200 13.3 7.4
Inconel 625 12.8 7.1
Inconel 718 13.0 7.2
Monel 15.7 8.7
Monel 400 13.9 7.7
Haynes Alloy 25 12.3 6.8
Invar 1.6 0.9
Super Invar 0.72 0.40
Kovar 5.1 2.8
Chemical Lead 29.3 16.3
Antimonial lead (6 %) 27.2 15.1
Tin (Commercially pure) 23.8 13.2
Lead - tin solder (60Sn - 40 Pb) 24.0 13.3
Zinc (Commercially pure) 23.0 - 32.5 12.7 - 18.1


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