×
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

T-1 equivilent to ASTM A514?
2

T-1 equivilent to ASTM A514?

T-1 equivilent to ASTM A514?

(OP)
It has been too many years so not sure if memory serves.

As I recall, T-1 is a US Steel trade name for a high strength low alloy (HSLA) constructional steel plate.  

ASTM A514 is the designation that comes to mind which includes the composition for T-1.

If 514 is the correct ASTM number, there is a table of alloys within the spec and one or more of these alloys are susceptible to brittle failure if thermally stress relieved.  I believe it was with reference to certain concentrations of Titanium and/or other alloying elements.

Because of thread330-263985: Welding 4140 to T-1 high tensile steel I was concerned that if someone here is not familiar with this embrittling phenomena of some of these HSLA materials and if T-1 is one of them that a post-weld thermal treatment might fall into the unwanted temperature range.

Will someone with access to ASTM specs please confirm or deny my concern?

RE: T-1 equivilent to ASTM A514?

2
Here is an answer grade for grade.

A 514-65 VS. A 514-00A

A 514-65 differs from A 514-00a at dozens of points. Table B–6 summarizes the substantial ones.  Unlike standards such as A 36, which have simple, non-proprietary chemistry requirements, each variant chemistry in A 514 represents a single mill's 100 ksi steel. For instance, Brockenbrough and Johnson (1968) identify A 514 Grade F as USS T1, A 514 Grade B as USS T1 Type A, and A 514 Grade H as USS T1 Type B.

page 83:

http://wtc.nist.gov/pubs/NISTNCSTAR1-3ADraft.pdf
 

RE: T-1 equivilent to ASTM A514?

The main characteristic of T1 is that it is a quench and tempered steel.  It gets its properties from heat treatment rather than alloying.  There are a large number of international equivalents from Europe, Scandanavia, Japan and here in Australia.  The steel is readily weldable and can be post weld heat treated or stress relieved but at a lower temperature than mild steel.  A suitable stress relieve temperature is 580C +/-10C

RE: T-1 equivilent to ASTM A514?

Hi Folks

Had an opportunity to talk to a fella from USS Steel a few years back, he indicated that unless required specifically by Code to avoid PWHT of these materials if possible, they are apparently very susceptible to grain boundary embrittlement...especially the older plate material.  He also indicated that the effect is cumulative, that is to say that it gets worse with each PWHT cycle the material undergoes...so it may not fail after the first PWHT cycle but you could have significantly decreased toughness in the HAZ.

We had a situation several years ago where it was impossible to weld repair the material as it kept cracking about 24 - 48 hrs after PWHT.  The material was preheated during welding,MPI and Radiographed after welding and before PWHT, no cracks were found...but after PWHT we never were able to do the MPI or Radiography as it had already cracked.

I believe some grades are more susceptible than others, there have been several papers published by USS Steel on the topic, unfortunately I dont know where the ones I had are now. A real eye opener to read...

RE: T-1 equivilent to ASTM A514?

(OP)
Thank you RPRad
I could not open or download the link provided by unclesyd vis:

http://wtc.nist.gov/pubs/NISTNCSTAR1-3ADraft.pdf

But I am thinking that the spec might even include the warning about PWHT and Thermal Stress Relief for the particular culprit alloys.

RE: T-1 equivilent to ASTM A514?

(OP)
unclesyd,
Thanks Good links.
I tried to copy and paste but the file will not allow copying.
In the first link, each and every Grade of either A514 or T-1 has one or the other of two footnotes (one crusifix or two crusifix):
one crusifix = PWHT may degrade strength and toughness...
two crusifix = ...may be susceptible to cracking in the heat affected zone of the welds during post-weld heat treatment (stress relief).

In the second link near the bottom:

Rule 4: Use caution in applying PWHT...several paragraphs delineaing the ill effects of PWHT i.e. cracking, brittleness..

In essence the steel supplier is recommending to not PWHT

This is not a project of mine.  Please refer to the OP and
thread330-263985: Welding 4140 to T-1 high tensile steel: Welding 4140 to T-1 high tensile steel

My concern was that I saw no recommendations about PWHT on that thread -- but, I just re-read the Origianl Posting at the above thread which included the comment:

Quote (kroppkaka (Computer)):

We can't reheat treat this joint after welding.
  so I guess I beat that dead horse well beyond its second death!  I suppose overkill would be more succinct.

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