×
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

Boron addition to T-316L ... why?

Boron addition to T-316L ... why?

Boron addition to T-316L ... why?

(OP)
For an ultra-low sulfur version of T-316L, our melter asked if we should add boron.  We typically add 20lb. of ferroboron to our standard version of T-316L, and we make the addition in the ladle when tapping the AOD (40 ton heat).  I know the boron won't have any affect on the sulfur, but it got me to do some investigating.

Per Shieldalloy's Ferroalloys and Alloying Additives Handbook (www.shieldalloy.com/contents.html), boron reacts readily with oxygen and nitrogen in liquid steel.  Although the steel is fully killed when our ladle ferroboron addition is made, we have a nitrogen spec of 0.070-0.095, which I would think is more than enough to react completely with the amount of boron that we add.  Our ferroboron is 17.5% B.

So my question is this, why add the boron at all?  I've asked a few folks around here, but haven't gotten a straight answer yet, so I figured I'd throw it out to all of you.  Any insight would be appreciated.

RE: Boron addition to T-316L ... why?

Boron can be used to increase high-temperature properties (strength and creep) with additions of about 0.1%. It's detremental to tensile properties at room temperature (gross grain-boundary precipitates). Elongation can drop as low as 5%!
I've heart of boron additions to stainless for nuclear applications (ion-absorption), but that was for 304.

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