×
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

"Cold" Service Metal welded to "Normal" Service Metal

"Cold" Service Metal welded to "Normal" Service Metal

"Cold" Service Metal welded to "Normal" Service Metal

(OP)
I have a small piece of "in-line" equipment made up of a cylinder and flange on each end. The cylinder was specced as SA-333 Gr. 6 (min temp -50F at my thickness by B16.5). The flanges were specced at A-105 (min temp -20F by B16.5). The MDMT for this project is -20F. I have two questions:

1. Why would the vendor quote SA-333 Gr. 6 when SA-106 Gr B. would have been acceptable for my thickness? I would think that it would be more expensive to produce SA-333 Gr. 6 but perhaps this is a misconception. I have noticed many vendors quoting SA-333 Gr. 6 for pipe that is not in low temperature service.

2. Are there any problems welding a SA-333 Gr. 6 ("low" temp) to a A-105 ("normal" temp) flange? I assume they have the same carbon content so there should be no issues but I am not very versed in welding.

Any help would be appreciated! Thanks in advance.

RE: "Cold" Service Metal welded to "Normal" Service Metal

Probably the use of a A333 Grade 6 was readily available versus A 106. Also, A 106 is seamless carbon steel pipe specified for elevated temperature service. There should be no weldabilty issues or concerns with the stated materials. Follow proper preheat requirements and maintenance.

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