Dwyer TIC Manuel d'utilisateur télécharger pdf (Page 75)

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

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 81 82

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