×
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

Oil quenching 17-4 PH

Oil quenching 17-4 PH

Oil quenching 17-4 PH

(OP)
Has anyone heard of an H900 process on 17-4 PH that involves oil quenching? Possible in europe?


Thanks!

RE: Oil quenching 17-4 PH

I dont know why, the precipitation reaction that H900 produces wouldn't be affected by cooling rate from the precipitation temp. I dont know for sure but you also wouldnt want to carbonize (thats probabaly not a word) any oil onto the steel. (much like fingerprints on the steel before H900)

Nick
I love materials science!

RE: Oil quenching 17-4 PH

H900 is only heat in an oven for few hours at 900F. PH steels are not quenched and tempered as carbon and alloy steels to gain strength and toughness.

RE: Oil quenching 17-4 PH

(OP)
NickE, Israelkk,
Thanks for the response. I have never heard of oil quenching of PH steels and couldn't figure out why you would want to do it.
Someone new to my organization (not sure might be my boss some day) insists that he worked somewhere that did oil quenching. I'm just trying to:
a. figure out why
b. figure out if he knows what he is talking about.

Thanks,

RE: Oil quenching 17-4 PH

What parts are you heat treating? For academic reasons what amount of carbon pickup can occur if oil quenched?

RE: Oil quenching 17-4 PH

The oil quenching would probably be from the solution treatment temperature, not the aging temperature.

With very large sections, there may be concern that air cooling from the solution treatment temperatures may not be rapid enough to prevent transformaton. I am not sure how large the section has to be for this concern to be valid, however.  I know that air cooling is fine for solids up to 6 inch (150mm).  I think it is more important that to cool it below 100 deg F.

I cannot remember the specifics, but I do seem to remember some specifications in the mid 1980's that called for air cooling or oil quenching from the solution treatment temperatures for 17-4.  

RE: Oil quenching 17-4 PH

According to Heat Treaters Guide (ASM) it is not uncommon to oil quench 17-4 castings from the solution temperature.

RE: Oil quenching 17-4 PH

While solutionising heavy section castings, as the cold air blast was insufficient to uniformly cool, I have water quenched ,immediately removed the parts from the tank and packed them in betwee ice blocks. Our being a tropical climate ambient temperature in the foundry will be 40 C + and not less.

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