×
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

Dimension vs. Heat Treat
2

Dimension vs. Heat Treat

Dimension vs. Heat Treat

(OP)
I have a question in regards to Heat Treatment of metals vs. Dimensional characteristics.

Ex. Carbon Steel ASTM A-1011 TY B

.125 +/-.005 THK x 2" +/-.005 Outside Dia.

Under standard heat treatment practices for hardeneing of metals. Will the dimensional characteristics of the parent material alter enough to be a cause of concern for the finished part after it has normalized from heat treatment?

RE: Dimension vs. Heat Treat

Hot-rolled carbon steel according to ASTM A1011 cannot be hardened by thermal processing. Do you know the exact process for "hardening", i.e. time, temperature, etc.

RE: Dimension vs. Heat Treat

Quote:

Will the dimensional characteristics of the parent material alter enough to be a cause of concern for the finished part after it has normalized from heat treatment?
The answer is most certianly. You can keep dimensional changes to a minimum by several methods, but a normalizing treatment has the possibility of resulting in more than 0.005" distoriton in 2".

rp

RE: Dimension vs. Heat Treat

"Hot-rolled carbon steel according to ASTM A1011 cannot be hardened by thermal processing."

At least not by thermal processing alone, i.e. you would need a carburizing or carbo-nitriding step.

RE: Dimension vs. Heat Treat

(OP)
I spoke with the machineist and he corrected me the type steel is type A2. 1850 degrees for 2 hours.

RE: Dimension vs. Heat Treat

While A2 tool steel is an air-hardening grade, meaning that it does not require quenching in water or oil to transform the microstructure to martensite, +/-.005 is too tight a tolerance to expect after heating to 1850 F followed by air cooling.

RE: Dimension vs. Heat Treat

(OP)
Thank you for the info.

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