Both the micro-hardness and the optical method are referenced in ASTM A-574 and I am looking for a Standard that details how the optical decarb test is performed.
- Is the Nital solution warm, hot or ambient ?
- how long is the item kept in the Nital ?
- etc. etc.
When I find the Standard (SAE, ASTM, MIL etc.) that details the optical test (as a minimum) I'll purchase it.
Thanks in advance for your time.