×
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

SAE4140

SAE4140

SAE4140

(OP)
I'm trying to find out what the differences are between SAE4140 & SAE 4142 steels.  Is 4142 just a prehardened form of 4140?

RE: SAE4140

According to SAE J404 Chemical Compositions of SAE Alloy Steels, alloy 4140 has an allowable carbon concentration (in mass percent) of 0.38-0.43 while alloy 4142 has an allowable carbon concentration of 0.40-0.45.

According to SAE J1268 Hardenability Bands for Carbon and Alloy H Steels, alloy 4142 has better hardenability.

4142 is not a prehardened version of 4140.  They both require the same thermomechanical processing to develop their properties.

RE: SAE4140

The 'code' for all these types of alloys is that the last two numbers designate the nominal carbon content - 4130 has a nominal 0.30%C, 4340 a nominal 0.40%C, 4145 a nominal 0.45%C etc

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