×
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

Higher Strength 316 SS Forgings
2

Higher Strength 316 SS Forgings

Higher Strength 316 SS Forgings

(OP)
We source Type 316 stainless steel forgings for manufacture of some of our machined products.  We need to get as much strength as possible in these forgings to optimize the performance of our products.  We have specified Carbon and Nitrogen contents as high as our suppliers will accept within the spec composition range for Type 316, and requested that our forger control his forging temperature to as low as possible.  (He was forging near the "splatter" temperature range, and is constantly b****ing about die life.)  We are getting Yield Strengths in the low 40s ksi range and hardnesses in the low 80s Rockwell B.  We would like to get higher YS and hardness > 90 Rb.  Any suggestions on what other options exist for increasing these properties and still maintaining certification per ASTM A-182, Type 316?

RE: Higher Strength 316 SS Forgings

2
By raising carbon and nitrogen you are doing all you can to strengthen the austenite by alloying. But you are probaly driving doen the ferrite percentage if your supplier isn't raising chrome, moly, or silicon to compensate. You can increase the yield strength by 300 psi for each percent ferrite. Up to 9 or 10% won't hurt.
If you can't further refine grain size that's all you can do without changing grades. Have you considered 2205 with it's 60,000psi+ yield strength?
Can you put any cold work into the component?

RE: Higher Strength 316 SS Forgings

(OP)
McGuire:  We have seriously considered 316N, and still may go that direction.  We do not have the flexibility to go to the duplex alloy, although I would like to.  The grain size is affected mostly by the forging temperature, and as I mentioned, I do not have confidence that it is being properly controlled.  But that's an internal problem.  Thanks for the heads-up on ferrite content.  I frankly missed that, and it should have been obvious to me.

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