High carbon chromium bearing steel

High carbon chromium bearing steel grades, characteristics and applications of high carbon chromium bearing steel with high contact fatigue strength and wear resistance, many brands are all hardening steel, such as GCr15, GCr15SiMn, GCr15SiMo, GCr18Mo. But due to some bearing to the core with good toughness and need high surface hardness, thus develop the limited hardenability bearing steel, such as GCr4. ① GCr15（ The hardening steel) GCr15 is the typical steel, high carbon chromium bearing steel after quenching and tempering of high hardness, abrasion resistance and contact fatigue strength. The hot working performance and good machinability is good, hardenability is moderate, but poor weldability. GCr15 white sensitivity is big, but when using vacuum degassing refined bearing, the defect can be eliminated. Used in the manufacture of wall thickness is 12 mm, or less rolling bearing ring diameter 250 mm or less, or manufacturing acuities were 22 mm diameter conical, cylindrical and spherical roller and all size of the needle. Can also be used in the manufacture of moulds and woodworking cutting tools, measuring tool and high elastic limit, high fatigue strength of machine parts. ② GCr15SiMn（ High hardening steel) On the basis of GCr15 steel improve the content of silicon, manganese, and hardenability, elastic limit and wear resistance are better than GCr15. Produced by the use of rolling bearing temperature should not exceed 180 ℃. Used in the manufacture of wall thickness & gt; 12 mm, outside diameter & gt; 120 mm rolling bearing ring, diameter & gt; Steel ball and the diameter of 50 mm & gt; 22 mm conical, cylindrical and spherical roller and all the size of the needle. Other USES for the same as the GCr15. ③ GCr15SiMo（ High hardening steel) On the basis of GCr15 increasing silicon content, add the molybdenum. Its high hardenability and good abrasion resistance, high fatigue strength, good comprehensive performance. Suitable for large size range of the rolling bearing ring and ball, roller, etc. ④ GCr18Mo（ High hardening steel) On the basis of GCr15 quality score in 0. 15% ~ 0. 25% of molybdenum, and improves the content, thus hardenability and abrasion resistance are vigilant. Can be carried out under the bainite isothermal quenching, reaching close to martensite quenching hardness and wear resistance, and the impact of the steel, the fracture toughness and bending strength are improved, and thus improve the comprehensive mechanical properties of steel and longevity. Can be made of rolling bearing ring wall thickness up to 20 mm, the size range of rolling bearing is also expanding. ⑤ GCr4（ Restrictions on hardening steel) GCr4 is low hardenability rolling bearing steel, with volume heating and surface hardening after tempering, has the GCr15 bearing steel hardening type and the performance of the low carbon alloy carburizing steel. After quenching on the surface of high hardness, surface patience good resistance, fatigue resistance performance is good, the heart of 35 ~ 40 HRC hardness, good toughness, impact resistant. Mainly used in the manufacture of different sizes, from small load of rolling bearing ring and roller.