"17-4" is a nickname. The law is ASTM A564/A564M (Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars).
Headline: Stop overpaying for 17-4 PH stainless steel. Read the spec first. 🛑
❌ Assuming "A564" guarantees magnetic permeability is low. (Hint: 17-4 is magnetic in H900).
If you are specifying Type 630 (17-4 PH) for shafts, gears, or aerospace fittings, you need —not just a mill cert.
👉 I’ve extracted the specific Table 3 (Mechanical Properties) from the latest ASTM A564 revision. [Link to your PDF or comment "SEND" for a copy]
Are you still using H900 for marine environments, or have you switched to H1150M? Option 2: Instagram / Threads / Carousel Script (Visual & Punchy) Slide 1 (Cover): Title: ASTM A564 Explained in 60 Seconds Subtitle: The bible for 17-4 PH bar stock.
You order "17-4 Stainless." The mill sends "Condition A" (annealed). You try to machine it, and it’s gummy. 🥴 Because you forgot to specify the heat treat condition.