1.7220 | 34CrMo4 +QT (12.9) Prior austenite grain boundaries
| Numeric designation | 1.7220 |
|---|---|
| Chemical designation | 34CrMo4 |
| State | +QT (12.9) Prior austenite grain boundaries |
| Etching | PAG HT |
The highly tempered screw material was successfully etched onto former austenite grain boundaries using “PAG HT”. The copper precipitate is polished off on a stationary, wet OPS disc (ChemTec). Depending on the alloy, 25% ammonia and a cotton swab are required to remove the copper precipitate.
Parameters:
- Etchant PAG HT (made by Schmitz)
- 3 min (images 1 and 2)
- 1 min (pictures 3 and 4)
- Room temperature
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