×
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

No minimum hardness value for SA213 - 2004
2

No minimum hardness value for SA213 - 2004

No minimum hardness value for SA213 - 2004

(OP)
Hi all,

I just wondering why only maximum hardness is specified for all materials in ASTM SA213 - Table 4 and not the minimum hardness. I think minimum hardness is also very important to look for material deterioration due to spheriodization as well as creep especially on low alloy steel when subjected high pressure and temperature . Any one can clarify on this?

RE: No minimum hardness value for SA213 - 2004

Yes. There was no agreement or consensus as to what the values should be.

RE: No minimum hardness value for SA213 - 2004

There is not a minimum hardness (in most cases), but there are minimum tensile and yield strengths. These provide the limiting conditions. As a practical matter, you can estimate minimum hardness (for the ferritic steels in the table) by converting minimum UTS to hardness using the table in ASTM A370.

RE: No minimum hardness value for SA213 - 2004

Also, maximum hardness can be well defined because it impacts forming, weldability and corrosion resistance in service.

RE: No minimum hardness value for SA213 - 2004

(OP)
metengr and mrfailure ...thank you very much for clarification, I really appreciate that...

RE: No minimum hardness value for SA213 - 2004

(OP)
What about the hardness for weldment. Where can i get the information on maximum and minimum hardness for weld deposit and HAZ? Is it depending on application?

RE: No minimum hardness value for SA213 - 2004

The hardness for weldments can be obtained for carbon and low alloy steels from ASM B31.3. I found this has been the best source for maximum hardness.

RE: No minimum hardness value for SA213 - 2004

(OP)
Thank you very much metengr

RE: No minimum hardness value for SA213 - 2004

(OP)
Hi metengr..when I go through ASME B31.3. ..I could not find the said weldments hardness value. Is it ASM B31.3 or ASME B31.3?..Is it the same? Sorry I am not familiar with this code....Appreciate your comment......

RE: No minimum hardness value for SA213 - 2004

replica
Look at Table 331.1.1 in ASME B31.3 Process Piping Code over to the right in the column are maximum hardness values. See Note 4 below, these values apply to bending and after PWHT, see Note 4 below

331.1.7 Hardness Tests. Hardness tests of production
welds and of hot bent and hot formed piping are
intended to verify satisfactory heat treatment. The hardness
limit applies to the weld and to the heat affected
zone (HAZ) tested as close as practicable to the edge of
the weld.
(a) Where a hardness limit is specified in Table 331.1.1,
at least 10% of welds, hot bends, and hot formed components
in each furnace heat treated batch and 100% of
those locally heat treated shall be tested.
(b) When dissimilar metals are joined by welding,
the hardness limits specified for the base and welding
materials in Table 331.1.1 shall be met for each material.

RE: No minimum hardness value for SA213 - 2004

(OP)
metengr......thank you very much for an excellent post....

RE: No minimum hardness value for SA213 - 2004

If memory serves correct, B31.3 does not address hardness for carbon steel. It defines hardness for maximums for specific low alloy steels but only in the PWHT condition.

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