×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

4340 Oil Quench

4340 Oil Quench

4340 Oil Quench

(OP)
Looking for some information on oil quenching 4340. I need to find an appropriate oil to quench a 2" thick piece of slab to a rockwell 50.

Is it possible to use a brine to achieve this without cracking? What is the highest HBC an air quench will reach?

RE: 4340 Oil Quench

4340 is quite quench crack sensitive. A brine is the not the way to go unless you really know what you are doing and have very tight control on the process.

Look for vendors that sell heat treathing supplies, they should have products to help you. Google "quench oils".

Air quenching 4340 in a 2" section would result in 35-45 HRC, depending. Of course, you will want to temper after quenching, so the final hardness will be somewhat less.

rp

RE: 4340 Oil Quench

Polymer quench can get you in that hardness region without cracking . But you need to monitor the quenchant closely for consistent results.

RE: 4340 Oil Quench

(OP)
How much oil/polymer would I need to avoid flashing? (20lb piece of 4340) This will be my first attemt at an oit quench so I'd like to be prepared but yet not go overboard on the volume.

What polymer would work for this application?

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!


Resources