×
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

heat treating stainless steel

heat treating stainless steel

heat treating stainless steel

(OP)
My question is, if I heat treat 303 Stainless Steel, will it retain the 30-50% elongation, which is good, or its tendency to creep under load, which is bad, or both, which is still bad.  Plus, I don't know anything about the process of heat treating, so I couldn't give any details on temps or quenches or the like.  Any advice in that realm would be greatly appreciated.

Background information:
I have a 303 Stainless Steel block, 8" x 2" x 1.5" tall, being loaded from the top with 10 - 30 kips.  Strain gages are mounting to measure the shear and bending strains.  The 303 Stainless shows signs of creep and plastic deformation, so I'd like to use something harder, but still retain a good % elongation such that the output of the strain gages will still give a reasonable uE/lb resolution.  It seems that the max stress on the block is around 60ksi under max load, so the block was under-designed significantly.  303 Stainless has a UTS/Yield Strength of 75/30 ksi, 30-50% elongation.  

I can:
Use readily available AISI 4140 Heat Treated Steel, which should give me a UTS/Yield Strength around 125/100 ksi, 18% elongation.  This will corrode, which is probably not a problem, but is yet to be agreed upon.
Heat Treat the 303 Stainless to get the Yield around 100 ksi.
Heat Treat 13-4 Stainless, which my co-worker "heard" is stronger, but I haven't had a chance to look into it.

Thanks for the info.

Chad Schneider
raidoh@yahoo.com

RE: heat treating stainless steel

You may want to consider 17-4PH.  This is a precipitation hardenable (thus the PH designation) alloy with fair to good corrosion resistance.  It is used quite often in shafting and other high strength applications.  However, it is rather brittle compared to the austentitic grades.  17-4PH has a UTS/YS of 150/110 and elongation of 15% in condition A material.  It is available in several different heat treated conditions.

You may also want to consider a nickel alloy.  Alloy C-276 has a UTS/YS of 118/50 and elongation of 60%.  The nickel alloy will be considerable more expensive in material costs and machining but has outstanding corrosion resistance in some of the more severe chemical applications.  Check out the Haynes website at http://www.haynesintl.com/mini/C276s/C276.htm

Best of luck

Kayakscout

RE: heat treating stainless steel

It sounds like you could simply use an inexpensive martensitis stainless steel such as 410. it can be quenched and tempered to the same levels as the 4140.
If you don't want to heat treat, use 2205 which has about 65000 PSI yield strength as annaealed and super corrosion resistance. Consult with the people at stainlesscenter.com.
It's free and not for profit.

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