1.1269 | C85S +QW +T Prior austenite grain boundaries
| Numeric designation | 1.1269 |
|---|---|
| Chemical designation | C85S |
| State | +QW +T Prior austenite grain boundaries |
| Etching | PAG HT |
This hypereutectoid steel (sheet material with cross-section = 3 x 20 mm) with 0.82 % carbon (measured with OES; target: 0.8 – 0.9 %) was austenitized for 30 min at 810 °C, quenched in water and then tempered at 250 °C for 2 hours.
The unalloyed and low tempered steel was successfully etched onto former austenite grain boundaries using “PAG HT”.
The copper precipitate is polished off on a stationary, wet OPS disk (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
- Room temperature
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