×
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

Tempering Curve of BS 970: 665M17 (EN34)

Tempering Curve of BS 970: 665M17 (EN34)

Tempering Curve of BS 970: 665M17 (EN34)

(OP)
Hi,


I can't find a tempering curve of BS 970: 665M17 (EN34).

I want to check the typical properties of this material, carburised  hardened and tempered to HRC 60 to 62 to see what the core is like after the treatment.. with particular reference to  the yield and the ultimate strenghts, elongation and fracture toughness of the core (Charpy Impact Energy could do if Kc not available).  

Can anyone point me in the right direction?

Thanks


 

RE: Tempering Curve of BS 970: 665M17 (EN34)

The properties will vary depending on the heat treatment parameters used, because there is more than one way to achieve 60-62 HRC.  If the parts are direct quenched from a carburizing temperature of 925 C and tempered at 150 C then the core properties will be approximately as follows:

yield = 800 MPa
tensile = 1000 MPa
elongation ~ 17%
hardness ~ 33 HRC (311 HB)


If the parts were carburized at 925 C, slow cooled, reheated to 815 C, quenched & tempered at 150 C then the core properties will be approximately as follows:

yield = 575 MPa
tensile = 800 MPa
elongation ~ 19%
hardness ~ 29 HRC (277 HB)
Izod impact ~ 58 J for t < 13 mm (up to ~ 100 J for larger sizes)


The latter process improves the impact properties, so using direct quenching you can expect Izod values at least 20% lower.  The source of this data is the ASM Heat Treater's Guide for alloy SAE 4620/4620H.

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