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

heat treating 440c stainless steel

heat treating 440c stainless steel

heat treating 440c stainless steel

I have a customer who has ordered clamp feet made of 440c. What he wishes to achieve is to have a corrosion resistant but also hardenable clamp feet for mixer motors in a salad dressing mfg facility. What I need is exact info on how to heat treat 440c to a state that is both hard and also tough  to resist some fairly serious compression and torque without deformation or cracking. The info I have found to date talks of things like soaking but gives no time frame for this step. I have yet to find out if this material needs to be wrapped in 321 foil prior to heating. In general what I have found to date is so incomplete that I cannot go forward with this project. Of course any he3lp at all would be greatly appreciated. Thanks, Dave Ault-

RE: heat treating 440c stainless steel

Soaking times employed in the hardening of martensitic stainless steels such as alloy 440C represent a compromise between achieving maximum solution of chromium-iron carbides for maximum strength and corrosion resistance, and avoiding decarburization, excessive grain growth, retained austenite, brittleness, and quench cracking.

For sections 13 mm and under, a soaking time of 30-60 minutes is recommended.  For most parts, adding 30 minutes for each additional inch of thickness is adequate.  Soaking times should be doubled if parts have previously been fully annealed or isothermally annealed.

You can find more information at the following websites:




Strangely, Carpenter's website merely mentions soaking, with no associated time.  Perhaps their information is what you have been seeing.  Other than this omission, I highly recommend them, and their website for technical content:

http://www.cartech.com  ;(click on Technical Information)

RE: heat treating 440c stainless steel

Heat treat and temper in a vacuum or inert atmosphere if possible. I'm no metallurgist, but the corrosion resistance of 440C can be seriously affected by heat treatment, and my experience has been that surface oxidation, crud & corruption or whatever, caused by exposure to air during heat treatment, doesn't help matters much. Of course this would negate the need for stainless steel foil wrap, too.

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


eBook - Integrating the Engineering Ecosystem
Aras Innovator provides multiple options for integrating data between systems, depending on the scenario. Utilizing the right approach to meet specific business requirements is vital. These needs range from authoring tools, federating data from various and dissimilar databases, and triggering processes and workflows. Download Now
Research Report - Simulation-Driven Design for SOLIDWORKS Users
In this engineering.com research report, we discuss the rising role of simulation and the paradigm shift commonly called the democratization of simulation. In particular, we focus on how SOLIDWORKS users can take advantage of simulation-driven design through two analysis tools: SOLIDWORKS Simulation and 3DEXPERIENCE WORKS. Download Now
White Paper - Industry 4.0 and the Future of Engineering Education
With industries becoming more automated, more tech-driven and more complex, engineers need to keep their skills and knowledge up to date in order to stay on top of this wave—and to be prepared for the Industry 4.0 future. The University of Cincinnati offers two online Master of Engineering degree programs designed specifically for practicing engineers. Download Now
eBook - The Design Gridlock Manifesto
In this eBook, you’ll learn 6 ways old CAD technology slows your company down and hear how design teams have put those problems to rest. “The Design Gridlock Manifesto” shares first-hand modern CAD experiences from 15 companies around the world. 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