Ferromagnetic or not?

[Sol71]

Hi,

I had a list of materials sent to me today with the question are the materials ferromagnetic or not?
- ASTM A193 B7M,
- 18-8 st steel,
- BS 1449 HR4,
- ASTM A216 WCB,
What I have found out so far is that 18-8 stainless (ally 304) is austenitic and not ferromagnetic. ASTM A193 B/M is listed in the standard under ferritic material, and hence should be ferromagnetic. As far as I can find BS 1449 HR4 and ASTM A216 WBC are both ferromagnetic. Can anyone please confirm if my findings are correct or give input to the correct answer.
Thank you

 

[metengr]

Your on the correct track.

 

[EdStainless]

Depending on composition and cold work 304SS can be fairly magnetic, or not.
Most of the lower alloy 300 and 200 alloys are meta-stable and will contain some amount of residual delta ferrite and well as forming strain induced martensite.
You are correct, the others are all fully ferromagnetic.

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P.E. Metallurgy, Plymouth Tube