×
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

Effect of lead on stainless steels forgings ?

Effect of lead on stainless steels forgings ?

Effect of lead on stainless steels forgings ?

(OP)
Hi everybody

I have an ingot (316L) with a high amount of lead "19 ppm"

What is the impact of the amount of lead on:

The hot working?
Mechanical properties?
Corrosion resistance?

I don't read any thing any in internationals Standard !

What is the maximum amount permitted in stainless steels ?

Is related to the market: Nuclear, Corrosion, Structure... ?

Is it related to the stainless steel class : Austenitic, Martensitic, Ferritic, Duplex or SuperDuplex

Thanks in advance
 

RE: Effect of lead on stainless steels forgings ?

If Pb is detectable in grain boundaries then you will have very poor hot workability.
I would guess that anything above the limits of detection is going to be a problem.

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

RE: Effect of lead on stainless steels forgings ?

I don't think 19ppm of lead is necessarily a high lead content.
Lead is not normally specified for any SS products that I deal with on a day to day basis as an Inspector here in Japan. It is routinely low by virtue of the melting methods used to produce the mother billets....Is there some reason you think this is high. Long ago I worked for a company making castings in all grades of stainless heat resisting and corrosion resisting grades. My recollection is that, as a special requirement, some customers specified lead and tin restrictions on cast 25Cr20Ni of 0.010% max for centrispun furnace tube - weld fabricated into furnace coils - no problems in fabrication or service...that was the only grade I recall as having a specified limit for lead and I am sure all the other grades of stainless we made had much more than 0.010%......19ppm is what....0.0019% - I don't think there is a problem here for hot working, welding, corrosion resistance or mechanical properties whatsoever....anyone disagree with this out there?

RE: Effect of lead on stainless steels forgings ?

I would through a fit over 0.002% Pb.  The only times that I have ever checked it was undetectable.
If the steel was made in a good AOD/VOD or similar method then I would expect the Pb to be lower.
Where an how was this melted?
I would still have some SEM work done.  If there are any Pb islands in the grain boundaries then hot work and welding would both be problems.
There should be no impact on corrosion resistance.

= = = = = = = = = = = = = = = = = = = =
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