×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

301 SST magnetic in full hard condition?

301 SST magnetic in full hard condition?

301 SST magnetic in full hard condition?

(OP)
A QC person where I work was using the magnet test to determine if a washer supposedly produced from 301 SST was non-magnetic. I find that there is a 37-45 Rc hardness requirement that can only be achieved in the full hard condition. Am I correct in thinking that the material will be at least slighly magnetic in this state?

BCK

RE: 301 SST magnetic in full hard condition?

QC is guy is right - 301ss is non-magnetic.

Your concern on hardness is independent with magnetism.

RE: 301 SST magnetic in full hard condition?

Yes, full hard 301 will be noticeably magnetic.

"Magnetic Permeability
Properly annealed Type 301 is completely austenitic
and magnetic permeability is 1.02 maximum at 200H.
Cold working promotes the formation of martensite
and the magnetic permeability is increased. The
amount of martensite formed depends on the amount
of cold rolling, temperature of cold rolling, and
composition. Figure 1 shows the increase in magnetic
permeability with cold rolling at room temperature."

Directly from the Allegheny Ludlum Blue Sheet on 301
http://www.alleghenytechnologies.com/ludlum/pages/products/xq/asp/P.17/qx/product.html#
To see the graph.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: 301 SST magnetic in full hard condition?

Thanks to EdStainless, something I learned today.

RE: 301 SST magnetic in full hard condition?

There is the Ms and Mf but above the Ms there is the Md which is the temperature where deformation transforms the 300 series to martensite. This is often seen in things like 304 cable which may become partially magnetic because of this.It confuses people because they say it's magnetic so it can't be 300 !! We used to make special springs from 301 by rolling to pretty much full hard. As mentioned magnetism and hardness may not correlate !

RE: 301 SST magnetic in full hard condition?

If you warm SS before you cold work it you can greatly reduce the martensite transformation.  It only changes the mechanical properties a little, but reduces the magnetism a lot.  Yo don't have to get hot.  Depending on the grade a temp of 250-400F is usually all that you need to see the difference.
This is not a good process though since minor shifts in chemistry will shift the temp required.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources