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Thermal Electrical Properties Table Chart Iron per BS2789

Engineering Materials Database

This table defined the thermal and electrical properties of ductile iron grades covered UK specification BS2789.

Grade
Thermal conductivity,
100 °C (212 °F)
W/m · K
(Btu/ft · °F)
at 500 °C (930 °F)
Specific heat capacity,
20-700 °C
(68-1290 °F)
Coefficient of
thermal
expansion at
20-400 °C
(68-750 °F), 10-6/K
Electrical resistivity,
μΩ/m
J/kg · K
Btu/lb · °F
Ferritic Grades
350/22;
350/22L40
36.5 (21.1)
35.8 (20.7)
603
0.144
12.5
0.500
400/18;
400/18L20
36.5 (21.1)
35.8 (20.7)
603
0.144
12.5
0.500
420/12
36.5 (21.1)
35.8 (20.7)
603
0.144
12.5
0.500
Intermediate Grades
450/10
36.5 (21.1)
35.8 (20.7)
603
0.144
12.5
0.500
500/7
36.5 (21.1)
34.9 (20.2)
603
0.144
12.5
0.510
600/3
32.8 (18.9)
32.2 (18.6)
603
0.144
12.5
0.530
Pearlitic as Cast and Normalized Grades
700/2
31.4 (18.2)
30.8 (17.8)
603
0.144
12.5
0.540
800/2
31.4 (18.2)
30.8 (17.8)
603
0.144
12.5
0.540
900/2
31.4 (18.2)
30.8 (17.8)
603
0.144
12.5
0.540
Hardened and Tempered Grades
700/2
33.5 (19.4)
32.9 (19.0)
603
0.144
12.5
0.540
800/2
33.5 (19.4)
32.9 (19.0)
603
0.144
12.5
0.540

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