×
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

The optimum velocity of the oil in tank during quenching
2

The optimum velocity of the oil in tank during quenching

The optimum velocity of the oil in tank during quenching

(OP)
We have a oil tank for the quenching  steel parts.
The question is : what the optimum velocity in the oil tank to get the best  quenching ?

 

RE: The optimum velocity of the oil in tank during quenching

Perhaps you mean the flowrate of the pumps to remove hot oil and bring in the cooled oil.

There are many factors influencing like the quantity of steel to be quenched,size of tank,quantity of oil,any stirrers or agitators,efficiency of heat exchanger etc.

it would be best you discuss with your furnace manufacturer.

Are you facing any problem during quenching? Please let us know.
 

I have not failed. I've just found 10,000 ways that won't work." — Thomas Edison
_____________________________________
 

RE: The optimum velocity of the oil in tank during quenching

(OP)
Hi arunmrao

yes the flowrate of the oil is 0.8 m/S in oil  near the pumps and 0.1 m/s in the last part of the tank

And i would like to know how can this influence the mechanical properties of the parts



 

RE: The optimum velocity of the oil in tank during quenching

There are many factors pertaining to the oil that will influence the mechanical properties of the parts.  The velocity of the oil is one of them.  In general, the faster the oil is moving over the surface of the part, the faster heat will be removed and the faster the cooling rate will be.  Whether or not this is important depends on the part size and geometry as well as the chemical analysis of the steel.  If you are experiencing problems with low and/or spotty final hardness of the parts, increasing the velocity of the oil in the quench may help.  On the other hand, it might not, particularly if there are other issues, such as oil temperature, quench tank design, surface condition of the parts, or even prior microstructure of the material being processed.  

If you are having specific problems, as arunmrao has suggested, you may be better off discussing them with either the furnace manufacturer or your quench oil vendor.  They will probably want to take a look at the instillation and may spot issues that haven't been mentioned.  

rp

RE: The optimum velocity of the oil in tank during quenching

Redpicker has rightly emphasised the need to have sufficient oil at all locations to achieve uniform cooling.

Please check the outlets for any blockage from oil sludge or scale.

If possible realign the distribution outlets in the tank.

Try if providing agitators at the end or low flow rate zones reduces your problem.

Finally,imagine you have a large casting with multiple ingates. You need to fill the furthest part first and always provide hot metal so that the ingate does not freeze .How do you solve such a problem?

Use the same analogy and redesign your oil distribution network.

Hope it helps.
 

I have not failed. I've just found 10,000 ways that won't work." — Thomas Edison
_____________________________________
 

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