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


A 516 Gr 70 for 450°C

A 516 Gr 70 for 450°C

A 516 Gr 70 for 450°C

A 516 Gr 70 can be used for exhaust system having temperature 450°C at atmospheric pressure. How the note G10 from ASME BPVC
Sec-II D will affect if I select the above material.

RE: A 516 Gr 70 for 450°C

This note means this material will degrade at this temperature, over time. The degradation could be either spheroidization or graphitization damage. However, since this is being used as an exhaust system and not under pressure, should degradation occur there most likely would be no serious consequences. It is your choice, if it were me I would use a 1.25% Cr-1/2% Mo material.

RE: A 516 Gr 70 for 450°C

Actually initially we also planned for Alloy material but the cost and the welding process is stringent as per construction point of view. So the topic of using CS is initiated. Is it possible to calculated degradation over the period of time or any kind of thumb rule consideration.

RE: A 516 Gr 70 for 450°C



but the cost and the welding process is stringent as per construction point of view

Disagree. The cost of using SA 387 plate, Gr 2 or Gr 11 is not that much more than SA 516 Gr 70 plate, and the welding being stringent means you use preheat. I doubt the plate thickness will require PWHT for an exhaust system. Why bother to evaluate CS when you have a better option????

RE: A 516 Gr 70 for 450°C

Automotive and diesel exhaust systems have been made from T409 and T321 stainless steels for decades.

They have shown a very long life and are the preferred materials for OEMS.

"Thumb rules" for the corrosion rate in this kind of service are a joke

Can your welding division work with these materials, or is carbon steel the only material that they are familiar with ?

Sr. Process Engineer

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!


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