| Bluing Parameters |
| 1 |
Punching Oil on Lamination |
The Laminations should be thoroughly cleaned to remove punching oil for better results |
| 2 |
Furnace atmosphere |
Controlled Oxidizing & Non Carburising atmosphere |
| 3 |
Oxygen content in side the bluing furnace |
< 1000 PPM |
| 4 |
Heat Resistance in open air |
200 ± 10° C |
| 5 |
Introduction of Steam |
Super saturated steam, Temp > 160 ° C to have a dew point in bluing furnace > 15 ° C Steam purging to be started at 200 ° C and continue till 450 ° C |
| 6 |
Bluing Temperature |
450 ± 10° C |
| 7 |
Heating rate till 450° C |
100° C / Hr |
| 8 |
Soaking time |
1 to 2 Hrs depending on Charge Weight in presence of steam |
| 9 |
Unloading Temperature |
200 ° C Steam purging to be on till the furnace reaches down to 200 ° C |
