×
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

Heating 17-7Ph a little, how much softer?

Heating 17-7Ph a little, how much softer?

Heating 17-7Ph a little, how much softer?

(OP)
I have some 17-7Ph stainless steel that is in the CH condition. So its been cold rolled and then had 1 hour at 480 degrees C. Now I need to heat it again for 1 hour at 120 degrees C. So how much softer will it get? I mean will i lose 1% or 10%? on the yield strength. What would you think? Regards, Ant.

RE: Heating 17-7Ph a little, how much softer?

Look at the publication below regarding information on consition and heat treatment;

http://www.aksteel.com/pdf/markets_products/stainl...

Review table 5 which is elevated temperature tensile properties to determine the effects of exposure temperature at 120 deg C.

So, I see two options - the first is to assume if you took CH900 and exposed it to 120 deg C you can determine how much the UTS and TS could drop at that temperature, and use the % drop as worst case scenario.

OR second option, I would expect even less of a change in the CH900 properties from option 1 above because the exposure temperature (up to 120 deg C and back down to RT) is too low to cause any appreciable changes. To prove this option, run a coupon of the CH900, expose it to the second temperature, cool and test for UTS, RA and elongation. This is the only way to know for sure.

RE: Heating 17-7Ph a little, how much softer?

Sorry, typos

Quote:

consition
should be condition

Quote:

UTS and TS

TS should be YS

RE: Heating 17-7Ph a little, how much softer?

As stated nothing will happen. We have numerous production parts made from 17/4 PH, normally condition H 1125 that run for periods of time at 285°C and then are subject to up to 6 hrs at 770°F and 1 hr at 900°F for cleaning. Even some parts at condition H 925 see no change.

Point of interest:
There is a phenomena that does manifest itself after about 100 thermal cycles and that is we start getting an increase
in hardness with some loss of elongation. We have seen a rise in from hardness from 40 Rc to around 48 Rc over time. We will normally overage them at this point.

RE: Heating 17-7Ph a little, how much softer?

(OP)
It looks like I lose 6% and presumably on cooling I won't get any of that back.

RE: Heating 17-7Ph a little, how much softer?

If this material is CH900 and you heat it to 120C you will have slightly lower strength while it is hot, but upon cooling it will be exactly as it was before.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Heating 17-7Ph a little, how much softer?

(OP)
Oh good. Thanks.

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