Oil Quenching

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Oil Quenching

One of the most critical parts in the heat treatment of a metal part is the quench, or the rapid cooling of the part to achieve specified properties. No quenching medium is perfect. There are benefits and drawbacks of each, whether it’s salt, oil, gas or caustic. In a game of trade-offs, oil is the most popular quenching medium because it offers the widest array of benefits to the widest array of parts. We have 12000 liters & 27000 liters capacity of Oil Quenching tank.


Oil is preferable to the traditional quenching medium of water because it reduces the risks of distortions or cracking by cooling metals more evenly and more quickly.

Types of Oil

Different types of oil used in quenching can yield different results, and the type of oil used depends in part upon the type of metal being heat treated. Some oils control distortion and reduce the risk of cracking of a highly hardenable alloy by ensuring that there is not much variation between the surface temperature and the core temperature during a quench. These oils are called hot oils because they are kept at much higher temperatures.


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Fast oils are used typically used on low-hardenability alloys and low-carbon steel and are so called because they have specific properties that cool items more quickly by altering the length of the different stages of the cooling process.


The process of quenching heat treated metal consists of three stages. The shortest stage is the boiling stage, which comes after the vapor stage and before the convection stage.

Vapor blanket phase

In the initial vapor blanket stage, the hot metal is submerged into the quenching oil. The temperature difference between the hot metal and the cool liquid causes the oil to vaporize. Cooling of the metal is impeded by the vapors that surround the metal, like a blanket, and prevent heat transfer.

Nucleate boiling phase

The oil is boiled in the second stage, causing the vapor blanket to dissipate and allowing heat energy to transfer from the metal to the oil.

Convection phase

Once the oil reaches its boiling point, heat energy dissipates during the convection stage.

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+91 99740 38980

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+91 99740 12322

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