To Redpicker: My mention "Puting to oil at 1055 for 30 min" had mistake - it should be 155F @30 min. Sorry for that.
Approacing the 1480F was unfortunatelly uncontrolled. Your suggestion regarding to use horizontal mounting and putting platen separaters is much appreciated. We will try.
It...
Thank you fo responds. Additional info:
1.Quinching medium:
-Heating up to 1480F at 30min. Discs been separated.
-Soaking time- 1h
- Puting to oil at 1055 for 30 min
-Postwash at 160F
-Tempering , not forced air at 300F at 2hour
2. Parts have been hangled in on basket - no clamping
3.Flatness- .01"
Need help urgently.We have 4130 disc OD21"xID13"x.109"THK distortion after heat treatment to approach HRC35-40. It was probably result of thermostress differences between ID and OD areas. How to releave thermostress and provide again smooth hardening?
