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To get a good plastic state, forging high-quality forgings, INA Bearing forging must be within the specified temperature range. Determine the forging temperature range, mainly set initial forging temperature and final forging temperature. In order to improve the ductility and lower deformation resistance, so forging temperature can be increased to as much as possible on the iron-carbon equilibrium diagram AE line position. But the temperature is too high, too prone to overheating burn. AE line should be less than l00 ~ 200 ~ C.
     So hypoeutectoid steel forging temperature should be at the beginning of 1200 ~ 1250 ~ C, hypereutectoid steel before forging temperature between 1050 ~ 1150 ℃. GCI ? 15INA Bearing eutectoid steel is steel, the superheat temperature is 1150 ~ 11800C, and in order to reduce the severity of decarbonization, avoid sharp grain growth, generally its initial forging temperature to 1050 ~ l100 ℃. To prevent the phenomenon of hardening in the forging, forging should end at a suitable temperature. Hypoeutectoid steel forging temperature should be controlled at the end of the line above GS 30 to 50%, because then the steel in the austenite region, has the best plastic.
     However, in order to expand forging INA Bearing temperature range, low carbon steel final forging temperature can be reduced to the following general GS line (at about 800 ℃). Then Steel have entered into two tissues (ferrite + austenite) region, but because of the ferrite plastic pretty good, does not reduce the steel malleable. For eutectoid steel, forged if SE detriment above the stop, tends to occur within the forging forging finished mesh carbide (carbide in the form of a mesh distributed in the grain boundary), affecting the quality of the finished product.
      If SE forged in the following line, PSK line 50 ~ 70 ~ (2 ends, you can put steel. Temperature Arc mesh carbide precipitation gradually crushed, thus improving the mechanical properties of forgings, since then the temperature is still relatively high, metal or plastic better.
Full name INA Bearing steel bearing steel, high compressive strength and fatigue limit, high hardness, high wear resistance and a certain toughness, hardenability good, very strict control of sulfur and phosphorus, is a high-quality steel , do cold work die steel.
     (A) bearing steel forging temperature
     (1) initial forging temperature: 1150 (1120) Final satin temperature: 850 (800) degrees.
     (2) prior to forging remove surface defects in the rapid heating try to warm up.
     (3) When the processing temperature should be 200 to 400 degrees to avoid the blue brittle zone. Thermal processing, should avoid entering the high temperature brittle zone (greater than 1250). Should avoid entering the hot brittle zone (800 to 950 degrees).
     (B) heat treatment after forging
     (1) after forging - pre-heat treatment (annealing of the ball) - the final heat treatment (quenching and tempering)
     (2) ball annealing purpose: to reduce the hardness, ease of processing, preparing for the quenching.
     Ball annealing process: heating to 750 ~ 770 degrees, holding a certain time, slowly cooled to 600 degrees below air cooling.
     (C) quenching and quenching medium
     (1) quenching color (experience) most white and tough hard and brittle, yellow, hard and tough, soft blue.
     (2) INA Bearing quenching medium
     A Water: Average temperature does not exceed 40 degrees, without oil, soap and other impurities.
     Salt and alkali aqueous solution B: water plus 5% salt or base to 10.
     Salt solution is ten times the cooling rate of water, high and uniform hardness, but organizational stress, have some rust effect. Temperature is less than 60 degrees.
     Alkaline solution (caustic soda solution) corrosive large and small adapt range.
     C oil: including oil, spindle oil, transformer oil, diesel and so on. Can reduce the deformation and cracking. NA carbon steel. Oil temperature: 60 ~ 80 degrees, with a maximum of 100 to 120 degrees.