The optimum velocity of the oil in tank during quenching 2

[stanislasdz]

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 ?

 

[arunmrao]

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
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[stanislasdz]

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

 

[redpicker]

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

 

[arunmrao]

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
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