Good translation Metal Products (Shanghai) bearing steel companies (domestic bearing steel / bearing steel imports) GCr9 bearing steel / GCr9 steel / GCr9 steel bar GCr9 coil / GCr9 steel / GCr9 pipe / GCr9 wire (good translation Metal Products (Shanghai ) Co., Ltd.) 
 GCr9 
 Chromium bearing steel standard: GB / T 18254-2002 
 Feature 
 Wear resistance and hardenability of steel than GCr6 high machinability can still, cold plastic strain medium, poor welding, white point of the formation are more sensitive to heat treatment there is tendency to temper brittleness. Used in the manufacture of steel ball diameter 13.5-25.4mm, 10.3-18.5mm diameter tapered roller, cylindrical roller diameter of 9.4-17.2 and 9.2-17.1 diameter of the spherical roller. 
 GCr9 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. 
 Use 
 For the production of bearing rings and rolling elements, such as: production of internal combustion engine, motor vehicles, automobiles, tractors, machine tools, rolling machine, drilling machine, mining machinery, general machinery, and high-speed rotation of the mechanical transmission of high load bearing steel ball, roller and ring. In addition to doing the ball of the bearing rings endures, and sometimes used to make tools such as dies, measuring tools. 
 Chemical composition 
 Carbon C :1.00-1 .10 
 Si Si :0.15-0 .35 
 Manganese Mn :0.25-0 .45 
 Chromium Cr :0.90-1 .20 
 Mo Mo: ≤ 0.08 
 Phosphorus P: ≤ 0.025 
 Sulfur S: ≤ 0.025 
 Ni-Ni: ≤ 0.25 
 Copper Cu: ≤ 0.25 
 Ni + Cu Ni + Cu: ≤ 0.50 
 Mechanical properties 
 ● Mechanical Properties: heat: ball or soft annealed 
 Brinell hardness (HBW) :179-207 
 Heat treatment process 
 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. 
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 (Good translation Metal Products (Shanghai) Co., Ltd. published) 
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