Nitriding heat treatment manufacturer - Xinguang Thermal Treatment states that nitriding is carried out when other alloy elements come into contact with nascent nitrogen. However, the generation of nascent nitrogen occurs when ammonia gas comes into contact with the steel material during heating, and the steel material itself becomes a catalyst, promoting the decomposition of ammonia. Although nitriding can be carried out under ammonia gas of various decomposition rates, a decomposition rate of 15% to 30% is generally adopted, and the required thickness for nitriding is maintained for at least 4 to 10 hours. The treatment temperature is maintained at around 520℃. Next, we will mainly talk about liquid nitriding in nitriding treatment.

The main difference of liquid soft nitriding is that there is Fe3Nε phase and Fe4Nr phase in the nitriding layer, but no Fe2Nξ phase nitride. ξ phase compounds are hard and brittle and are not suitable for nitriding treatment. The nitriding heat treatment manufacturer said that the method of liquid soft nitriding is to first remove rust and degrease the workpiece to be treated, preheat it, and then place it in the nitriding crucible. The crucible is mainly composed of TF-1 as the main salt and is heated to 560-600℃ for several minutes to several hours. The depth of the nitride layer is determined by the magnitude of the external force load on the workpiece. During the treatment, an air tube must be introduced at the bottom of the crucible to decompose a certain amount of air nitride salt into CN or CNO, which then penetrates and disperse onto the working surface. The outermost layer of compounds on the workpiece surface contains 8 to 9%wt of N and a small amount of C and a dispersed layer. Nitrogen atoms are dispersed into the α -Fe base to make the steel part more fatigue-resistant. During the nitriding process, due to the decomposition and consumption of CNO, the salt composition needs to be tested every 6 to 8 hours of treatment to adjust the air volume or add new salt.

The nitriding heat treatment manufacturer mentioned that the material used for liquid soft nitriding treatment is iron metal. The surface hardness after nitriding is higher when it contains Al, Cr, Mo, and Ti elements. The higher the gold content, the shallower the nitriding depth, such as carbon steel Hv 350 ~ 650, stainless steel Hv 1000 ~ 1200, and nitrided steel Hv 800 ~ 1100.

Liquid soft nitriding is suitable for wear-resistant and fatigue-resistant automotive parts, sewing machines, cameras, etc., such as cylinder liner treatment, valve treatment, piston cylinder treatment and mold areas that are not easy to deform. Countries that adopt liquid soft nitriding include Western European countries, the United States, the Soviet Union, and Japan.

The above is what Xinguang Thermal Treatment, a nitriding heat treatment manufacturer, has sorted out and released for everyone. Xinguang Heat Treatment Industry (Kunshan) Co., Ltd. is a professional heat treatment processing manufacturer, providing metal heat treatment, vacuum heat treatment, and mesh belt furnace heat treatment. We offer service and brand guarantees. Welcome to consult!