×
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!

*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

Crack in forming of A240-304l dished head

Crack in forming of A240-304l dished head

Crack in forming of A240-304l dished head

(OP)
Dear friends
As you know minimum tensile of A240-304l is 485Mpa ,its yield is 170Mpa and minimum elongation is 40%.
We purchased a plate with the below specifications for dished head and the dished head has 2 weld lines.
Tensile:779Mpa
Yield: 584Mpa
Elongation :46%
Our process for production of dished head is dishing & flanging.
During flanging the weld lines cracked.
According to standard our material, chemically and mechanically is in accordance with A240- 304l.
Does anybody has some experience like this matter?
Do we have to purchase material with lower mechanical properties or higher elongation?
Thanks

RE: Crack in forming of A240-304l dished head

(OP)
Dear dehurjati sen
Yes. The numbers which I mensioned above for mechanical properties are according to lab tests.
Thanks

RE: Crack in forming of A240-304l dished head

You need material that is softer to start with.
This plate does not look well annealed to start with.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Crack in forming of A240-304l dished head

Agree with Ed.

RE: Crack in forming of A240-304l dished head

with strength that high I am guessing that you can measure a difference between the L and the T values.
Values of 600/300 would not be uncommon, but the elong should be >55% if this is truly annealed 304L.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Crack in forming of A240-304l dished head

(OP)
Dear Edstainless
What do you mean by L and T values?
Thanks

RE: Crack in forming of A240-304l dished head

Longitudinal and transverse to the rolling directions.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Crack in forming of A240-304l dished head

(OP)
Dear Edstainless
Thanks for your valuable post. Have you any Idea about the ideal difference between L and T values?

RE: Crack in forming of A240-304l dished head

You say the fracture was in the weld lines. Did it break in the weld metal, HAZ, or base metal. Did it break in all 4 locations where the welds are in the knuckle? What is the nominal thickness? Thickness in the area of fracture? What shape head is being made? What is the KR? Grade of SS? Weld process? Filler metal?

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

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