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Cooling Treatment and Operation Precautions of Valve Castings

Ⅰ. Valve castings with high carbon content require special cooling treatment

Nowadays, more and more carbon steel casting valve castings are used in society, and the demand for it is also increasing. Therefore, the quality requirements will also be improved. Good quality cannot be separated from good processing technology. Cooling is the process of valve casting processing. A very important step, and for valve castings with higher carbon content, the cooling process is more complicated than ordinary valve castings.

The advantages of valve castings compared to other castings:

1. When the valve castings with medium carbon content are air-cooled, they should be scattered in a dry place at room temperature;

2. Valve castings should be quenched immediately after high-frequency quenching. The waiting time should not exceed four hours, and when the valve castings are used in medium carbon steel castings with low carbon content, the shape of the castings is relatively simple, but nor more than sixteen hours;

3. Cleaning, cryogenic treatment or quenching can be realized after cooling to indoor temperature;

4. For welded fittings composed of valve castings, the waiting time between welding and subsequent heat treatment shall not exceed four hours.

Ⅱ. What should be paid attention to in the cooling operation of valve castings?

It can be said that most of the casting process of valve castings is inseparable from the operation of cooling, and no matter what the casting method is, cooling can actually be said to be a very important step.

When most metals are converted from liquid to solid, or from high temperature to normal temperature, some changes will inevitably occur in their internal structure. How to guide these changes to a method that is beneficial to valve castings, this is in the valve. Points to be paid attention to during casting cooling operation.

In the traditional process of forging valve castings, the cooling operation can generally be referred to as quenching. Whether it is the temperature of quenching, the benefits of quenching, or the precautions for quenching, these are actually the points that need to be paid attention to during the cooling operation of valve castings.

As for the cooling operation of the casting method, this is actually simpler in principle than the forging method. However, due to the need to convert from liquid metal to solid metal, the operation is more complex than forging valve castings.

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