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


4140 steel hardening

4140 steel hardening

4140 steel hardening

I always meet the problem about hardening 4140 steel at my work. I used to induction or flame harden 4140 heat treaded and stress released (HTSR) steel to HRC 54-56 but someone told me I should use 4140 annealed steel because if I use pre-hardened material, I need anneal it first and then re-harden it. I knew that the core of annealed 4140 likes mild steel, which is not I wanted. My past experience also told me that it does not need to anneal 4140 preharden steel before re-hardening. I am looking for suggeston that what is the adventage and what is application for hardening each material. Thanks for you help.

RE: 4140 steel hardening

I have used much pre-hardened 4140 (~32RC) for various tooling applications and had it flame hardened with no problems. Most everything I work with has a cross sectional thickness of greater than 2 inches, and the very reason of not annealing it is to maintain that core hardness for overall strength and longevity of the tool. Did the person who suggested annealing have any experience with the material? I'm interested to hear what other posters have to share about this.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

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