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

From TWI job knoweldge 103

From TWI job knoweldge 103

From TWI job knoweldge 103

Dear sir,

If we see the TWI- Job knoweldge 103, there is table as shown below.
Table 1 Typical compositions of some austenitic stainless steel alloys

(type) Composition wt% Microstructure
C (max) Si (max) Mn (max) Cr Ni Mo Others Austenite - A
Ferrite - F
304 0.08 0.75 2.0 18/20 8/11 - - A+2/8%F
304L 0.035 0.75 2.0 18/20 8/11 - - A + 2/8%F
304H 0.04 - 0.10 0.75 2.0 18/20 8/11 - - A + 2/8%F
304N 0.08 0.75 2.0 18/20 8/11 - 0.1/0.16N A + 2/8%F
316 0.08 0.75 2.0 16/18 11/14 2/3 - A + 3/10%F
347 0.08 0.75 2.0 17/20 9/13 - Nb : 10xC A + 4/12%F
321 0.08 0.75 2.0 17/19 9/12 - Ti: 5xC A + 4/12%F
310 0.15 0.75 2.0 24/26 19/22 - - 100% A
309 0.08 1.0 2.0 22/24 12/15 - - A + 8/15%F
308L (generally filler metal only) 0.03 1.0 2.0 19/21 10/12 A + 4/12%F

In this table what is meant by 2/8 % F- i know that F is delta ferrtie , only want to know what is 2/8 and why 316L material not shown in table.
Any special reason behind the not showing such common usable material 316L.

Pls giude
Prasad rode

RE: From TWI job knoweldge 103

The nomenclature means A (austenite phase) + (and) 2/8 is 2 to 8% ferrite phase range

RE: From TWI job knoweldge 103

Thanks for the clarify about ferrite phase range.

But why they not shown 316L, however, shown 304, 304L, 304H, 304N.

Why not 316L. Any special reason?

This is most common used material.

RE: From TWI job knoweldge 103

Possibly was left out because 316L follows 316 regarding ferrite content. The same is true for 309L being left out.

RE: From TWI job knoweldge 103

Thank you

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


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