×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Difference between SA 387 F11 CL1 And SA 387 F11 Cl2 Material

Difference between SA 387 F11 CL1 And SA 387 F11 Cl2 Material

Difference between SA 387 F11 CL1 And SA 387 F11 Cl2 Material

(OP)
I`m Working on HE design where there is steam service at Design Temp of 475C and Operating Temp of 250C at 48KG/CM2 Design Pressure.

Material specified by Process team is 1.25 CR + 0.5 MO . I have Two options for plate material
1) SA 387 F11 CL1 :- Creep Temp = 480C , as material will be within creep range i can perform elastic platic calculation in UHX and get smaller thickness
2) SA 387 F11 CL2 :- Creep Temp = 455C ,as material will be in creep range , i cant perform elastic plastic calculation in UHX and getting higher thickness.

So my first choice was to go with SA 387 F11 CL1 but my seniors here are apprehensive of CL1 and instructing me to use CL2 strictly saying there is some problems of PWHT with CL1 Material.However i could not find much of difference between two class from ASME codes and API 934.
Kindly help me with knowing if there is any fabrication or NDE complexities with Cl1 material and where i could read more about different classes.

Thank you

RE: Difference between SA 387 F11 CL1 And SA 387 F11 Cl2 Material

ASTM can be very vague about the meanings of ‘class’ for low alloy steels. Usually it refers to heat treatment methods that are recognized across the industry. Given the higher specified mechanicals I’m guessing this is Q&T.

I’m not sure about PWHT problems with class 1; I’ve done it and it’s perfectly allowable in ASME construction codes. I suspect they are basing it on a well reported past failure that they want to apply to this steel for all time. I see non-metallurgists do this a lot.

After all that, a reputable supplier like Arcelor Mittal would be your best bet.

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

RE: Difference between SA 387 F11 CL1 And SA 387 F11 Cl2 Material

Ah, this should explain it. It’s about the minimum tempering temperature, which you can’t exceed for some classes. Your bosses may actually be on to something!

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

RE: Difference between SA 387 F11 CL1 And SA 387 F11 Cl2 Material

(OP)
@brimstoner
Thank you for your response.

can you please elaborate on min tempering temp ?
do you mean class 1 can not be tempered at 1150 F ?

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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