Good translation Metal Products (Shanghai) bearing steel companies (domestic bearing steel / bearing steel imports) GCr15 bearing steel / GCr15 steel / GCr15 steel bar GCr15 coil / GCr15 steel / GCr15 steel / GCr15 steel (good translation Metal Products (Shanghai ) Co., Ltd.) 
 Outline 
 GCr15 steel is an alloy content of less good performance, the most widely used high-carbon chromium bearing steel. After quenching and tempering of high hardness, uniform organization, good wear resistance, high contact fatigue performance. The cold steel, plastic medium, generally cutting, welding performance is poor, sensitive to the formation of white spots, and have a temper brittleness. Is in fact a Cr15. 
 GCr15 is one of the most commonly used high-chromium bearing steel, high hardenability, heat treatment is given to high and uniform hardness. Wear resistance than GCr9, contact fatigue strength, good dimensional stability and corrosion resistance, cold plastic deformation of the middle, cutting in general, poor welding, white point of the formation of sensitive, first temper brittleness. In the manufacture of ball bearings for impurities wall thickness 12mm. Diameter <250mm H-level to C-level bearing sleeve, 25.4-50.8mm diameter steel ball; diameter <22mm roller, in addition can also be used to withstand high the load. require high wear resistance. high elastic limit. high contact fatigue strength of the other mechanical parts and a variety of precision measuring tools Die and so on. Such as ball screw machine, turbojet nozzle spout. Plunger. Valve. Bush and so on. 
 Standard: 
 China GB/T18254-2002 
 Japan JIS G4805: 1991 
 U.S. ASTM A295: 1998 
 Unified digital code: B00150 
 Chemical / element content (%) 
 C :0.95-1 .05 Mn :0.25-0 .45 Si :0.15-0 .35 S: <= 0.025 P: <= 0.025 Cr :1.40-1 .65 Mo: ≤ 0.10 Ni: ≤ 0.30 Cu: ≤ 0.25 Ni + Cu ≤ 0.50 
 Heat treatment 
 The heat treatment system as: annealed steel bar, wire annealing, or 830-840 degrees oil quenching. 
 Heat treatment process parameters: 
 1 annealed :790-810-degree heat, furnace cooling to 650 degrees, the air-cooled - HB170-207 
 (2) :790-810 isothermal annealing heating degree ,710-720 degree temperature, air-cooled - HB207-229 
 3 normalizing :900-920-degree heat, air-cooled - HB270-390 
 4 high-temperature tempering :650-700-degree heat, air-cooled - HB229-285 
 5 Quenching: 860 degree heat, oil quenching - HRC62-66 
 6 :150-170-degree low-temperature tempering tempering, air-cooled - HRC61-66 
 7 carbonitriding :820-830 degrees permeation 1.5-3 hours, oil quenched, -60 degrees to -70 degrees to +150 degrees cryogenic treatment to +160 tempering, air-cooled - HRC ≈ 67 
 Manufacturing method 
 Bearing steel smelting of high quality requirements, the need for strict control of sulfur, phosphorus and non-metallic inclusions content and distribution, because the non-metallic inclusions content and distribution of life on the great influence of bearing steel. The higher the amount of inclusions, the shorter life expectancy. In order to improve the quality of smelting, smelting furnace and has recently been adopted by the ESR, we can use a vacuum smelting, vacuum consumable refining new techniques to improve the quality of bearing steel. 
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 (Good translation Metal Products (Shanghai) Co., Ltd. published) 
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