×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Duplex, 304 SS and 316 SS Certification

Duplex, 304 SS and 316 SS Certification

Duplex, 304 SS and 316 SS Certification

(OP)
Hi There,
We have been made aware of an Operator that has some Duplex material with very poor toughness (> 0 Deg C). We are aware of this issue with A105 material where the chemical composition and assumed toughness is not true due to manipulation of the chemistry with Boron etc.
We have reviewed the Duplex material certificates from our various suppliers and there is a wide range of documentation delivery. The simplest is just a chemical composition with tensile and hardness values up to a suite of chemical composition: Charpy values, Heat treatment temperatures and times, and grain structure slides.
The base requirement within the Duplex, 304 SS and 316 SS standards appears to be just composition with additional certificates available via Suplimentary Testing - to be specified by the Owner.

Are the ASTM base requirements satisfactory or do we need to specify Suplimentary Testing to ensure material toughness.

Regards, Mark

RE: Duplex, 304 SS and 316 SS Certification

For duplex you really should be specing A923 method B or C in order to assure that it was heat treated correctly.
The low toughness could be an indication of the presence of intermetallics. These will lower toughness and greatly lower corrosion resistance. The A923 B requires impact testing at -40 and gives minimum toughness values.
There is a great duplex guide published by IMOA
https://www.imoa.info/download_files/stainless-ste...

With 304 and 316 the most common additional test is A262 testing for sensitization.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Duplex, 304 SS and 316 SS Certification

ISO 17781
ISO 17782
NORSOK M-650
EEMUA Publication 218
IOGP S-563 - Datasheets ID141 to ID269 (free download - try Googling)

Steve Jones
Corrosion Management Consultant

www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

RE: Duplex, 304 SS and 316 SS Certification

(OP)
Thankyou to both EdStainless and Steve Jones for the information probided. Very Clear. Was not aware of those IOGP material datasheets. Mark

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close