High pressure gas quenching

---

For many years, gas quenching has been the preferred process for steel heat treatment. Nowadays, high pressure gas quenching is the most powerful solution in the field of high alloy steel to alloy steel. SIMUWU vacuum furnace manufacturer proposed low pressure carburizing equipment, and this solution has been significantly developed.

To be successful, SIMUWU vacuum furnace manufacturers combine two ideas:

1. Using the optimized gas exchange design to quench the parts in the cold chamber (or battery)

2. Increase the absolute quenching pressure from 5 bar to 20 bar

The high pressure gas quenching chamber is associated with our low pressure carburizing furnace and has the following main advantages:

1. No pollution and environmental protection process

2. Better distortion control

3. Reduce equipment maintenance costs

4. The best quenching efficiency

No pollution and environmental protection process

Nitrogen is usually used for gas quenching. Its low cost can transfer it from one load to another. Different from oil quenching, there is no need to clean after treatment.

Better distortion control

Gas quenching provides better deformation control during the cooling phase for the following reasons:

1. Unlike oil quenching, gas quenching does not produce burnout (bubbles on the surface of parts). The coolant maintains the same heat exchange coefficient throughout the load, which leads to high deformation uniformity between parts and better repeatability of the results.

2. The quenching deformation is mainly due to the internal constraints of the parts during martensitic transformation. The slower the cooling rate, the more important these constraints and deformations are. Therefore, it is necessary to precisely adjust the cooling rate to obtain martensitic transformation. The demand varies depending on the nature of the alloy, the geometry of the part and the required hardness.

Gas quenching allows the cooling rate between two loads to be adjusted by selecting the best mixing quenching rate and quenching pressure.

3. The quenching process allows a certain temperature level before martensitic transformation.

4. Reverse quenching allows reversing the direction of high pressure gas quenching in a short and fast cycle. This process greatly reduces hardness dispersion on compact loads or large parts.

Reduce equipment maintenance costs

After treatment, there is no need to clean the parts, which can save a lot of cost (no washing machine investment, no consumables, no waste, and more space available on the ground).

Optimum quenching efficiency

The quenching chamber is developed based on the numerical modeling of the parts and therefore through characterization. These hypotheses have been confirmed by experiments. This has also been applied to quench turbines, which are designed and designed with the support of expert partners in the field of aviation turbine computing.

Nitrogen is the most commonly used gas, but when higher quenching strength is required, helium can be provided.

In this case, a system for recycling quench gas is provided, which is made of a compressor, a vacuum pump, an intermediate storage balloon and a catalyst to ensure the purity of the gas from one cycle to another.

Quenching process can significantly improve the strength and wear resistance of parts.