Good translation Metal Products (Shanghai) bearing steel companies (domestic bearing steel / bearing steel imports) GCr15SiMn bearing steel / GCr15SiMn steel / GCr15SiMn steel bar GCr15SiMn coil / GCr15SiMn steel / GCr15SiMn pipe / GCr15SiMn wire (good translation Metal Products (Shanghai ) Co., Ltd.) 
 GCr15SiMn bearing steel 
 Introduction 
 Full name of bearing steel bearing steel, high compressive strength and fatigue limit, high hardness, high wear resistance and a certain toughness, hardenability, good control of sulfur and phosphorus are very strict, is an advanced high-quality steel, can be do do feel a cold steel. Specific gravity: 7.81 
 Wear resistance and hardenability higher than GCr15, cold plastic deformation of the middle. Weldability is poor. Dialogue to form sensitive point, when heat treatment temper brittleness. For the manufacture of wall thickness> 12mm. ≥ 250mm outside diameter of the ferrule; diameter 50.8-203.2 of the steel ball, diameter> 22mm roller; requirements is also available for other high hardness, high wear resistance of mechanical parts, such as roll. spiral gauge, etc. 
 Forging process 
 (A) bearing steel forging temperature 
 (1) before forging temperature: 1150 (1120) final satin temperature: 850 (800) degrees. 
 (2) removal of surface defects before forging, warm as possible after the rapid heating. 
 (3) The processing temperature should be 200 to 400 degrees to avoid the blue brittle region. Thermal processing, should avoid entering the high-temperature brittle zone (greater than 1250). Should avoid entering the hot brittle zone (800 ~ ~ 950 degrees). 
 (B) heat treatment after forging 
 (1) pre-heat treatment after forging ---- ()---- spheroidizing final heat treatment (quenching and tempering) 
 (2) spheroidizing purpose: to reduce the hardness, ease of processing, preparing for the quenching. 
 Ball annealing process: heating to 750 ~ ~ 770 degrees, holding a certain time, in the slow cooled to 600 degrees below air-cooled. 
 (3) a variety of bearing steel quenching and tempering and the hardness of the table 
 Steel quenching temperature and quenching and tempering medium hardness HRC 
 Oil GCr15SiMn 800 ~ 840 62 ~ 64 ~ 170 150 
 (C) quenching and quenching medium 
 (1) quenching color (experience) the most hard and brittle white, yellow, hard and tough, blue soft and tough. 
 (2) quenching medium 
 A water: general temperature does not exceed 40 degrees, without oil, soap and other impurities. 
 Salt and alkali aqueous solution B: 5 to 10 per cent increase in water salt or alkali. 
 Salt water solution is ten times the cooling rate, high hardness and uniform, but the stress of a large organization, there is some corrosion effect. Temperature less than 60 degrees. 
 Alkaline solution (caustic soda solution) corrosive large range of small to adapt. 
 C oil: including oil, spindle oil, transformer oil, diesel and so on. Reduces distortion and cracking. Not apply to carbon steel. Oil Temperature: 60 ~ ~ 80 degrees, a maximum of 100 to 120 degrees. 
 (D) tempering temperature 
 Bearing steel using low-temperature tempering. Temperature: 150 ~ 250 degrees. Can maintain a high hardness and high wear resistance under the premise of reducing the stress and brittle, so as not to use crack or premature failure. Hardness HRC: 58 ~ ~ 64. 
 Feature 
 ● Features and application: 
 GCr15 steel is based on an appropriate increase in Si, Mn content in order to improve its hardenability and elastic limit, wear resistance 
 Better than GCr15. Manufacture of rolling size range of application than GCr15 large, mainly for the manufacture of wall thickness> 
 12mm, diameter> 280mm diameter steel ball bearing ring> 50mm; conical, cylindrical and spherical roller diameter> 
 22mm and all sizes of needle. 
 Chemical composition 
 ● Chemical Composition: 
 Carbon C: 0.95 ~ 1.05 
 Si Si: 0.40 ~ 0.65 
 Manganese Mn: 0.90 ~ 1.20 
 Sulfur S: ≤ 0.020 
 Phosphorus P: ≤ 0.027 
 Chromium Cr: 1.30 ~ 1.65 
 Ni-Ni: ≤ 0.30 
 Copper Cu: ≤ 0.25 
 Mechanical properties 
 ● Mechanical Properties: 
 Tensile strength σb (MPa): 1831 
 Impact energy Akv (J): 23 
 Hardness: 65HRC 
 Sample size: a sample 
 ● Heat treatment and microstructure specifications: 
 Heat treatment specifications: 830 ~ 840 ℃ quenching oil cooling; 160 ℃ tempering 3h. 
 Microstructure: martensite. 
 Material Name: (cementite) bearing steel 
 Grade: G20CrMo 
 Standard: GB / T 3203-1982 
 ● Chemical Composition: 
 Carbon C: 0.17 ~ 0.23 (tolerance: ± 0.02) 
 Si Si: 0.20 ~ 0.35 (tolerance: ± 0.03) 
 Manganese Mn: 0.65 ~ 0.95 (tolerance: ± 0.04) 
 Sulfur S: ≤ 0.030 (tolerance: 0.005) 
 Phosphorus P: ≤ 0.030 (tolerance: 0.005) 
 Chromium Cr: 0.35 ~ 0.65 (tolerance: ± 0.15) 
 Copper Cu: ≤ 0.25 (Tolerance: +0.05) 
 Mo Mo: 0.08 ~ 0.15 (tolerance: ± 0.02) 
 ● Mechanical Properties: 
 ● Heat treatment and microstructure specifications: 
 ● Delivery status: hot-rolled or forged steel with hot-rolled (forged) state or annealed state delivery. Cold-drawn steel in the annealed condition delivered. 
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 (Good translation Metal Products (Shanghai) Co., Ltd. published) 
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