The advantages of salt bath quenching of full complement cylindrical roller bearings The general heat treatment of full complement cylindrical roller bearings is oil quenching, but some high-end quality bearings use salt bath quenching. The advantages of salt bath quenching are as follows: 1. The quenching heating time is short, the crystal grains will not be coarse, and the toughness is relatively strong, which is beneficial to strain. 2. The temperature distribution of the salt bath furnace is good, and the strain becomes less. 3. The cooling in the high temperature area is relatively fast, the cooling in the low temperature area is relatively slow, the quenching is simple, and the strain becomes smaller. 4. It can correspond to a wide range of heat treatment conditions (intermittent quenching, isothermal quenching, short-term heating, one-sided heat treatment, cooling, complex temperature changes, etc.). 5. Less oxidative decarbonization. 6. The adjustment of heat treatment temperature and time can be completed in a short period of time, and can cope with many models and small quantities. Salt bath heating techniques include direct heating (electrode) and external heating. The high temperature adopts the electrode type heated by direct current in the salt bath. Medium temperature and low temperature adopt external heat type. The external heat type is to enter the salt in the steel tank, and then heat the tank body. It is a little difficult to control the temperature, but the advantage is that in addition to electricity, it can also use gas, oil, etc., and the use of power is diversified. The full range of full complement cylindrical roller bearings have adopted salt bath quenching, such as SL045017, SL183005, SL182217, RSL182205 have been well received by customers. Only bearings quenched in a salt bath can increase their service life by an average of 30%. Therefore, customers who have high requirements for bearing quality and are expected to replace imports can pay more attention to heat treatment when selecting bearings.
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