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78
Appendix
Material Temperature
（
°C
）
Emissivity
approximation
Iron
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
Emissivity table (continue)