Comparison of QPQ Salt Bath Liquid Nitriding Process & Gas Nitriding Process

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1. QPQ Salt Bath Liquid Nitriding Process

QPQ metal surface treatment technology refers to the ferrous metal parts (ordinary low carbon steel, medium carbon steel, low bonding gold, medium and high alloy steels, etc.) in a variety of surface treatment salt baths or penetrant of different properties , through different temperature stages of multi-type, composite particles infiltration (non-metallic elements, gold ) to improve the appearance and internal performance of the workpiece, improve the performance of the workpiece in many ways, including appearance characteristics, wear resistance, corrosion resistance, fatigue resistance, etc.For a long time, foreign will this process call it QPQ, which is the shortened form of Quench — Polish — Quench .

 2. Performance characteristics of QPQ Metal surface Treatment Technology

①. Improve the surface hardness, wear resistance and fatigue resistance of the workpiece.

②. Greatly improve the anti-corrosion performance of the workpiece.

③. Small deformation after product treatment.

④. Short product treatment cycle and low treatment cost.

⑤. Minimal environmental pollution, in line with the direction of national environmental protection development.

⑥. Wide range of materials and technical applications

⑦. After oxidation treatment, the surface of the workpiece is black, bright and smooth.

2. Gas Nitriding Process

Gas nitriding heat treatment, in order to shorten the nitriding cycle and make the nitriding process not restricted by the steel type, in recent years, two new nitriding processes have been developed on the basis of the original nitriding process. Soft nitriding is essentially a low-temperature nitrocarburizing based on nitriding. At the same time as the infiltration of nitrogen atoms in steel, there is also a small amount of carbon atoms infiltrating. Compared with general gas nitriding, the hardness of the nitrided layer is higher. It is called soft nitriding because it has low chemistry and low brittleness.

3. Characteristics of Gas Nitriding

①. Make the surface of parts have high hardness and wear resistance.

②. It can improve the anti-fatigue ability.

③. Improve the corrosion resistance of the workpiece.

④. The processing temperature is low, and the deformation of the workpiece is small.

⑤. Not limited by steel type, carbon steel, low-alloy steel, tool steel, stainless steel, cast iron and iron-based powder metallurgical materials can all be soft-nitrided.

⑥. The surface hardness of the workpiece after nitrocarburizing is related to the nitriding process and material.

⑦. It can significantly improve the fatigue strength, seizure resistance and scratch resistance of parts.

Shanghai Geheng Vacuum Technology Co., Ltd. is a vacuum heat treatment furnace manufacturer with many years of experience in design, manufacturing and production. Mainly produce vacuum heat treatment furnace, vacuum sintering furnace, vacuum brazing furnace, New Energy And Environmental Protection Equipment and other vacuum equipments.Provide customized services, equipment work area can be based on customer output.