QPQ salt bath nitriding liquid nitriding nitriding salt

Our core business including:

1, provide liquid nitriding heat treatment agent nitriding salt,
2, salt bath nitriding technology transfer service,
3, provide nitriding heat treatment service for customers.

QPQ means quench, polish, quench and consists of salt bath nitrocarburizing followed by oxidative cooling, mechanical polishing, lapping or vibratory finishing and brief re-immersion into the oxidising salt melt. The end result gives unalloyed and low alloyed steels, a lustrous black finish with corrosion resistance which is superior in many cases to surfaces developed by galvanic or chemical processes.

Salt bath ferritic nitrocarburizing is also known as liquid nitriding or liquid nitrocarburizing or salt bath nitriding, it is a range of case hardening processes that diffuse nitrogen and carbon into ferrous metals at sub-critical temperatures. it is usually carried out between 580°C and 610°C, with treatment times in the order of 30 minutes to 3 hours. In some cases, salt bath nitrocarburising can be used as an alternative to other surface zone processes such as case hardening or hard chromium plating with equal or improved effectiveness and greater economy
The process is used to improve three main surface integrity aspects:
wear resistance
fatigue strength
corrosion resistance