| Annealing Parameters |
| 1 |
Punching Oil on Lamination |
The Laminations should be thoroughly cleaned to remove punching oil for better results |
| 2 |
Furnace atmosphere |
Preferably Wet Atmosphere
(N2 80% H2sub> 20% )
The Atmosphere should be non oxidizing & Non Carburising |
| 3 |
Dew point of the gas inside the annealing furnace |
Negative i.e. below 0 ° C |
| 4 |
Oxygen content in side the annealing furnace |
< 1000 PPM |
| 5 |
Heat Resistance in open air |
200°C |
| 6 |
Annealing Temperature |
790 ± 10 ° C |
| 7 |
heating rate till 790 deg C |
200 ° C / Hr |
| 8 |
Soaking time |
min 2 Hrs |
| 9 |
Cooling rate till 450 deg C |
25 ° C / Hr |
| Bluing parameters |
| 10 |
Furnace atmosphere |
Controlled Oxidising & non Carburising atmosphere |
| 11 |
Oxygen content in side the bluing furnace |
< 1000 PPM |
| 12 |
Introduction of Steam |
Super Saturated Steam, Temp > 160 ° C to have a dew Point in bluing furnace 15 ° C |
| 13 |
Bluing Temperature |
450 ± 10 ° C |
| 14 |
Soaking Time |
1 to 2 hrs depending on Charge Weight in presence of steam |
| 15 |
Unloading Temperature |
200 ° C |
