×
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

What is lowest MDMT of SA-266 Gr.2 & SA-106 Gr.B?

What is lowest MDMT of SA-266 Gr.2 & SA-106 Gr.B?

What is lowest MDMT of SA-266 Gr.2 & SA-106 Gr.B?

(OP)
Dear Sir,

Two questions:

1. SA-106 Gr.B has been requested (by client) for an MDMT of -28°C. And it got charpy tested at -28°C and failed. Is SA-106 Gr.B not suitable at -28°C?

2. Can SA-266 Gr.2 be used at -29°C? What's the lowest temperature it can pass during charpy V-notch testing?

Please share if anyone has experience.

Thanks.

 

RE: What is lowest MDMT of SA-266 Gr.2 & SA-106 Gr.B?

Vessel7;

Quote:

1. SA-106 Gr.B has been requested (by client) for an MDMT of -28°C. And it got charpy tested at -28°C and failed. Is SA-106 Gr.B not suitable at -28°C?

SA-106 Grade B material is most suitable for elevated temperature service (review the material specification scope). Hot finished pipe material could be supplied with no supplemental heat treatment but rest assured will have a coarse grain size that translates to much lower notch toughness. Notch toughness is not a requirement for this material.

If a normalize and temper heat treatment were specified, the material should be acceptable at -28 deg C. However, why not select an alternate pipe material?
 

RE: What is lowest MDMT of SA-266 Gr.2 & SA-106 Gr.B?

Question 2

Quote:

2. Can SA-266 Gr.2 be used at -29°C? What's the lowest temperature it can pass during charpy V-notch testing?

Yes, despite the higher carbon content this material can be acceptable for use at -29 deg C MDMT because it can be specified as normalized and tempered or quenched and tempered.
 

RE: What is lowest MDMT of SA-266 Gr.2 & SA-106 Gr.B?

(OP)
Thanks metengr.

Re SA-106 Gr.B, this material has been selected and procured based on client's material selection report (which allows SA-106 Gr.B above -29°C). But it failed during impact testing (reported at 10J avg against 27J min.).

Now we've decided to go with SA-333 Gr.6 which we normally specify for temp. below -29°C.

Again, thanks your advice.
 

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