The most common materials for bearing for bearing steel are used. The materials often used in the bearing steel are: carburizing bearing steel (G20CR2NI4A) and high -carbon chromium bearing steel (GCR15/GCR15SMN/GCR18M0). According to a specific understanding, the performance of these two bearing steel materials is shared. I hope that everyone can recognize when buying bearing materials and buy the most suitable bearing steel.
Carburizing bearing steel (G20CR2NI4A)
G20CR2NI4A bearing steel is a high -quality alloy carburizing steel (low carbon C: 0.17 ~ 0.23) for carburizing steel for manufacturing bearing parts. The bearing parts made with such steels are used to produce heat treatment by carburizing, raising fire, and fire. After the process, the surface has high hardness (hardness> HRC60) and a certain abrasion resistance and high resistance to contact fatigue. Low carbon C: 0.17 ~ 0.23 ensures that the heart has good toughness (hardness> HRC33 -48). This surface has the characteristics of toughness, which enables the carburizing bearing steel to work stably under the conditions with large impact loads. In short, the advantages of carburizing steel bearings are:
1. The surface of the surface is retained after the carburizing and quenching, and the anti -fatigue strength is good.
2. It has strong impact load capacity, and the surface sclerosis layer has a slight crack and it is not easy to expand inside. The surface has high hardness and low heart hardness (generally 35HRC ~ 40HRC). Compared with high -carbon chromium bearing steel, it has a good heart impact toughness.
3. The depth and concentration of carburizing can be adjusted as needed.
4. Restrictions on the size and thickness of the bearing parts.
High -carbon chromium bearing steel (GCR15/GCR15SMN/GCR18M0)
High -carbon chromium bearing steel is a high -carbon alloy steel containing 1.30 ~ 1.65%of chromium, which is characterized by: micro -tissue after thermal treatment is relatively uniform and stable, high and uniform in hardness, good wear resistance, high contact fatigue, good, good, good Size stability and corrosion resistance. After the ballistic annealing, its cutting performance is good. This steel can meet the requirements of the bearing of bearing running under general conditions.
1. High -carbon chromium bearing steel is widely used all over the world. The most commonly used card number is GCR15 and GCR15Simn. In my country, it accounts for about 80%of the total amount of bearing steel. The quenchtability is better than GCR15 steel, so for large -sized bearings parts, GCR15Simn steel should be used.
2. GCR15 bearing steel is largely used to make engine bearing, machine tools, motors, etc. used by vehicles, tractors, tanks, aircraft, etc., as well as railway vehicles, mining machinery, universal mechanical bearings.
3. GCR15SIMN bearing steel is mainly used to make large bearing with large wall thickness, such as a variety of large and extra large bearing, which is mostly used under the working conditions of no large impact load on heavy machine tools and rolling machines.
4. Because the cracks of GCR15SIMN steel are more sensitive and have poor shock toughness, the thick wall bearings with impact loads cannot fully meet the requirements of the use. Under the conditions of large impact loads, GCR15Simn steel is also restricted to use under the conditions of large impact loads. GCR18MO has now developed GCR18MO high -quenching steel and abrasion resistance. Its performance is superior to GCR15SIMN steel, and can replace GCR15Simn steel on railway bearings, rolling machine bearing, and mining mechanical bearings.