About GCr15 bearing steel is an alloy content is less, with a good performance, the most widely used carbon chromium bearing steel. After quenching and tempering, has a high and uniform hardness, good wear resistance, high contact fatigue properties. The steel cold working plastic medium, cutting performance in general, poor welding performance, sensitivity can be large for the formation of white spots, temper brittleness. Edit this paragraph the implementation of standards: of China GB/T18254-2002 Japan JIS G4805: 1991 ASTM A295: 1998 Unified Numbering: B00150 edit this paragraph chemical composition C :0.95-1 .05 Mn :0.20-0 .40 Si :0.15-0 .35 S: ≤ 0.020 P: ≤ 0.027 Cr 1.30 - 1 .65 Edit this paragraph heat-treated steel bars annealing, wire annealing or 830-840 degrees oil quenching. Edit this paragraph process parameters. Ordinary annealing :790-810-degree heat, furnace cooling to 650 degrees, the air-cooled - HB170-2 GCr15 bearing steel 
 072 isothermal annealing :790-810 ,710-720 degree heat, isothermal, air-cooled - HB207-229 3. Normalizing :900-920-degree heat, air-cooled - HB270-390 4. :650-700 high-temperature tempering degree of heating, air-cooled - HB229-285 5.: 860-degree heat of the quenching oil quenching - HRC62-66 6. the cryogenic tempering :150-170 degrees tempering, air-cooled - HRC61-66 7. carbon and nitrogen permeation: 820-830 degrees permeation 1.5-3 hours, oil quenched -60 degrees to -70 degrees to +150 degrees to +160 tempering, air-cooled - HRC ≈ cryogenic treatment 67 edit this paragraph manufacturing quality bearing steel smelting requirements high, the need for strict control of the content and distribution of sulfur, phosphorus, and non-metallic inclusions, because the content and distribution of non-metallic inclusions a great influence on the life of the bearing steel. Basic quality requirements of bearing steel is pure and homogeneous. Pure impurity elements and non-metallic debris less uniform carbide steel to small organizations, should be evenly distributed. The higher the amount of inclusions, the shorter the life. Smelting furnace in order to improve the smelting quality has recently and electroslag remelting also the vacuum smelting, and the vacuum consumable refining new process to improve the quality of the bearing steel. Edit this section uses do ball bearing rings, etc. In addition, it is sometimes used to make tools, dies, measuring tools. Edit this section features comprehensive performance is good. Ball annealing after cutting performance high and uniform hardness after quenching and tempering, high wear resistance and contact fatigue strength and good thermal processing performance. Contains more alloying elements, The price is relatively cheap.