1.5507 | 23MnB3 +Q Prior austenite grain boundaries
| Numeric designation | 1.5507 |
|---|---|
| Chemical designation | 23MnB3 |
| State | +Q (only hardened, not tempered) |
| Etching | PAG HT |
The NOT tempered and Cr-free 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 (first image)
- 1 min (image 2+3)
- Room temperature
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