Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. specializes in the development and production of high-quality austenitic stainless steel seamless pipe, nickel-nickel alloy and seamless pipe.
Austenitic stainless steel has excellent corrosion resistance and is widely used in chemical machinery, pharmaceutical machinery and food machinery. However, due to the low hardness of austenitic stainless steel and poor wear resistance, the surface properties of austenitic stainless steel that require wear resistance are difficult to meet the requirements of use, which greatly reduces the service life of these mechanical parts. . People have been looking for how to improve the wear resistance of austenitic stainless steel without reducing its corrosion resistance. Among them, the austenitic stainless steel ion heat treatment process and equipment are simple, and it is a very promising new technology for surface hardening treatment of austenitic stainless steel.
The surface of austenitic stainless steel can be hardened by using ion heat treatment technology at low temperature (nitriding<450℃, carburizing<550℃) to form a layer of supersaturated solid solution of nitrogen or carbon on the surface, and there must be no chromium Nitrides or carbides precipitate, and the structure with this characteristic is called S phase. The surface hardness of the hardened austenitic stainless steel is as high as 900HV, and its corrosion resistance is even better than that of the original austenitic stainless steel.
The key to surface hardening of austenitic stainless steel is how to control the temperature of the workpiece. If the temperature is low, the infiltration rate will be slow, and even nitrogen or carbon atoms will not penetrate into the matrix; if the treatment temperature is high, the infiltrated nitrogen or carbon will form chromium nitrides or carbides, reducing the concentration of free chromium on the surface of the stainless steel , The corrosion resistance of stainless steel decreases. Therefore, the surface hardening treatment temperature of austenitic stainless steel must be strictly controlled within ±5°C, which is difficult to achieve in general ion heat treatment equipment.
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