Rolling bearing material properties

2018 - rolling bearing material characteristics 10 - 23 according to national standard and bearing use requirement, currently used in rolling bearing ring and body material has high carbon chromium bearing steel, carburized bearing steel, etc. , these materials according to their different characteristics and is used for different occasions. Is not to say that with high value of carburizing steel material to make the bearing must be more appropriate than bearing steel bearing. A, high carbon chromium bearing steel is also called the hardenability steel hardness is consistent, both inside and outside is applied to ordinary occasions, its dosage the biggest, more than about 80% of the total amount of material. 1. GCr15 characteristics and USES: used for ordinary occasions, dosage the biggest, is suitable for the martensite and bainite hardening. Technical features: effective wall thickness under 26 mm, narrow, light series under 16 mm, quenching tempering hardness HRC57 ~ 62. 2. GCr15SiMn features and use: ordinary situations, for large bearing, only suitable for martensitic hardening. Technical features: effective wall thickness above 26 mm, narrow light series in more than 16 mm, quenching tempering hardness HRC57 ~ 62. GCr15 and GCr15SiMn is the most commonly used brand, can be seen from the above introduction of the two steel performance is basically the same, because GCr15SiMn steel hardenability is better than GCr15 steel, so for large size bearing parts, appropriate USES GCr15SiMn steel. GCr15SiMn bearing steel is mainly used to manufacture large wall thickness of the bearing, such as various types of large and super large bearings, used in heavy duty machine tools and there is no bigger impact load of rolling mill's working conditions. Due to large GCr15SiMn steel crack sensitivity, impact toughness is poor, for a thick wall with impact load bearing can not completely meet the use requirements. 3. Characteristics and USES: GCr18Mo bainite steel, wear-resistant occasions to use, only suitable for bainite hardening. Technical features: effective wall thickness between 26 ~ 48 mm, narrow, light series under 16 mm, quenching tempering hardness HRC57 ~ 62. Bainite abrasion resistance is better than martensite under therefore apply wear-resisting. Two and a half, carburizing bearing steel is also called the hardenability of steel soft hard outside, inside is said to have 'elastic material properties used for impact resistance, need to the carburizing and quenching, the process is relatively complex. G20Cr2Ni4A characteristics and USES: used for impact resistance, large bearing, deep carburizing. Technical features: effective carburized layer depth can be greater than 2. 5 mm, surface quenching tempering hardness HRC58-63. Made of this kind of steel bearing parts, after carburizing, quenching and tempering heat treatment process, has the very high surface hardness, Hardness & ge; HRC58） And certain abrasion resistance and contact fatigue strength is higher, and ensure its core has good toughness, Hardness HRC33 - 48) 。 The surface hardened the heart of the characteristics of the resilient, make the carburizing bearing steel is suitable for large impact load conditions can work stable. Keep surface compressive stress state after carburizing and quenching, good fatigue resistance. Ability to withstand the impact load, the surface hardened layer has not easily expand to the internal as well as micro crack. Surface has high hardness and the core hardness is low, compared with high carbon chromium bearing steel, has a good heart of impact toughness. The depth of carburizing can be according to the need to be adjusted and concentration. But G20CrNi4A bearing the high cost of material, and in small and medium size bearing on the use of, its life compared with bearing steel does not have a lot of ascension, so only choose in large bearing on carburizing steel.