If you are specifying Type 630 (17-4 PH) for shafts, gears, or aerospace fittings, you need —not just a mill cert.
Need the latest PDF with the 2023 revisions? Save this post & DM me "A564" for the link. 🔗 Option 3: Short Technical Note (For Email Newsletter or WhatsApp Group) Subject: Don't trust the nickname, trust the ASTM A564 PDF. astm a564 pdf
"17-4" is a nickname. The law is ASTM A564/A564M (Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars). If you are specifying Type 630 (17-4 PH)