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conversations.value: Roupeda: Ball strong war is the name of rolling bearing steel of high strength and fatigue endurance limit, suppression of high hardness, improving resistance and schedule of perseverance, through good hardenability, sulfur and control of yan, is a kind of high quality steel, can do confused area steel cold. 7. The proportion of 81:
  (1) minor temperature bearing steel.
   
  (1) initial forging temperature = 1150 (1120 km) words: 850 (800 kilograms).
  (2) minor before removing surface defects, maximize the rapid heating after preheating.
  (3) the Windows 200 ~ 200 when processing the blue brittle zone. The reason of the hot working, rather than area (brittle temperature 1250). As far as possible avoid into heat brittle zone (800 ~ 950 degrees). Today the debate focus =
  (2) heat treatment after forging.
  (1) (male) is said to have heat treatment after forging ahead - degradation - the final heat treatment quenching (+ cryogenic system)
  (2) the degradation of the  SKF Bearings  also reduce purpose: it is said that easily prepare processing quenching.
  Degradation is said to have heating process = 750 ~ 770, heat preservation time slowly cooled to 600 degrees cold Vienna.
   
  (3) all kinds of bearing steel quenching and low temperature through hard and table.
  Steel grade and quenching medium by HRC also qualitative low temperature quenching temperature.
  Gcr6 800 ~ 820 water and oil of 150 ~ 170, 62 and 64
  Gcr9 800 ~ 830 water and oil of 150 ~ 170, 62 and 64
  Gcr9simn oil and water of 150 ~ 160, 810-820, 62 and 64
  Gcr15 oil between 820 and 846, 150 ~ 820, 62 and 64
  Oil gcr15simn 800 ~ 840, 150 ~ 800, 62 and 64
  (3) quenching and quenching medium.
  (1) quenching color (white) experience the hard brittle yellow hard solid, blue soft, firm.
  (2) the quenching medium
  A: usually not more than 40 degrees Celsius water impurities such as the temperature of the oil soap.
  B inflammation and teachings of water in the water solution: 5/100 ~ 10 salt and place.
  Salt solution 10 times the speed of the cooling water, so your uniform, but should organization strength, coupled with the corrosion effect to some extent. Compared with the oilless bearing temperature 60 degrees.
  Base solution (liquid caustic and water soluble corrosion decay) is to cooperate in the narrow region.
  C spindle oil "including seed oil oil, transformer oil, light oil, etc. Can, in order to minimize the deformation of the status quo and. Carbon steel decided not to apply. = 60 ~ 80 degrees, the highest oil temperature is not more than 100 ~ 120.
   
  (4) by temperature.
  Ball bearing steel adopt low temperature. Temperature: 150 ~ 250 degrees. Can maintain high hardness and high grinding patience in the premise of mercy should reduce sex in the force and brittle when not used or damaged early. Posco has HRC: 58 ~ ~ 64.