×
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

URGENT! Need Brinell of 4150 at inner diameter of bar

URGENT! Need Brinell of 4150 at inner diameter of bar

URGENT! Need Brinell of 4150 at inner diameter of bar

(OP)
Shaft is made from 4150 non-resulphurized steel, machined from a 11.5" (292mm) bar. The subject diameter is 7" (178mm) where we need to know the estimated Brinell hardness.

At the OD of this material the Brinell is typically 269/321. However, the information we have from the vendor stops at 8" (203mm) diameter with that Ultimate Tensile listed at 115ksi.

Since this part was machined instead of forged, the properties diminish closer to the center. What I need to know is approximate Brinell reduction at different diameters from the outside working inward.

THANKS!!!
I'll also post in Material Eng forum


Timing has an awful lot to do with the outcome of a rain dance.

RE: URGENT! Need Brinell of 4150 at inner diameter of bar

Depending on a number of variables, the hardness can actually increase with increasing depths.  Yes, this is contrary to conventional wisdom, but you are dealing with a very large OD bar and you really won't know what happens unless you test the material.

At a 8" diameter, you are 1.75" below the 11.5" OD. With an Ultimate Tensile Strength of 115,000, I'd guess a Brinell hardness of around 241 HBW.  To get a 7" diameter, you'd have to go another 0.5" deeper.  

But, I doubt the Brinell diameter would change by more than 1.0 mm with only a 0.5" change in depth, so you are probably somewhere in the range of 255/229 HBW at your 7 inch diameter.

rp

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