30
Material
Temperature
(
°C
)
Emissivity
approximation
Polished cast iron
200
0.21
Processed cast iron
20
0.44
Polished tempered
Iron
40 ~ 250
0.28
Polished steel ingot
770 ~ 1040
0.52 ~ 0.56
Raw welded steel
945 ~ 1100
0.52 ~ 0.61
Surface ferric oxide
20
0.69
Completely rusty
surface
22
0.66
Rolled iron plate
100
0.74
Oxidized steel
198 ~ 600
0.64 ~ 0.78
Cast iron (Oxidizing at
600°C)
198 ~ 600
0.79
Steel (Oxidizing at
600°C)
125 ~ 520
0.78 ~ 0.82
Electrolytic ferric oxide 500 ~1200
0.85 ~ 0.89
Iron plate
925 ~ 1120
0.87 ~ 0.95
Cast iron, heavy ferric
oxide
25
0.80
Tempered iron, ferric
oxide
40 ~ 250
0.95
Melting surface
22
0.94
Melting cast iron
1300 ~ 1400
0.29
Melting mild steel
1600 ~ 1800
0.28
Liquid steel
1500 ~ 1650
0.42 ~ 0.53
Pure liquid iron
1515 ~ 1680
0.42 ~ 0.45
Emissivity table (cont.)
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