Owner manual

74
Appendix
Emissivity table (continue)
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
Melting mild steel
1600～1800
0.28
Liquid steel
1500～1650
0.42～0.53
Pure liquid iron
1515～1680
0.42～0.45