The PDF of ASTM E562-19 includes Table 1 (or similar), which correlates the expected volume fraction to the number of fields needed. For example, if you expect 50% phase, 400 points suffice; if you expect 2% phase, you may need 2,000+ points.
No, but they are related. ISO 9042 (Steel – Manual point counting method) is similar but not identical. ASTM E562-19 is more general for any metal or ceramic microstructure. astm e56219 pdf
Warning: Be wary of search results promising a free “astm e56219 pdf.” They often contain malware, watermarks, or outdated drafts from 2002 or 2011. The PDF of ASTM E562-19 includes Table 1