GENERAL
The 4320 Gnee steel is a processing steel connected to chromium, nickel and molybdenum and with a low carbon content for easy welding. The low carbon content allows the use of carburetion to increase wear resistance. It has medium hardenability with a combination of medium strength and fracture strength.
Chemical composition – C (0.17 to 0.22), Si (0.15 – 0.35), Mn (0.45 – 0.65), Cr (0.40-0.60), Ni (1, 65 to 2.00), Mo (0.20-0.30)
Supply conditions – Supplied with a maximum hardness of 260 HB.
APPLICATIONS
It is used in mechanical components where systems require uniformity of hardness along large or small cross-section. Due to their lower carbon content difficulties are lower compared to steels with 00: 40%. Its main applications are: shafts, gears, bearings, planetary gear bushings, sprockets, columns, crowns, covers and cylinders.
FORGE
Gnee 4320 steel must be kept at a minimum temperature of 870ºC and a maximum of 1240ºC.
HEAT TREATMENT
Annealing: The treatment should be carried out at a temperature of 870ºC for at least 1 hour for every 25 mm. Cool the oven. It is normally used in spheroidized state to reheat to 680 – 700 ° C, keep for 8 hours, cool in the oven to 300 ° C and then in the air.
Normalization: The treatment should be carried out at a temperature of 920 – 930ºC for at least 1 hour per 25 mm. Cold air. In special cases forced air can be used.
Carburetion: The hardening process can be used in cash, gas or salt bath. The temperature should be between 900 – 925ºC. The hardening time must be controlled according to the carbon potential and the specified hardening depth.
Cooling: rapid cooling can be performed directly after hardening simply by lowering the temperature to 840-850 ° C, maintaining the time needed to homogenize the temperature in the cross section and cooling in oil. Cooling can also be performed after cementing components with room temperature cooling. In this case, using the same procedure described.
Tempering: It should be done immediately after tempering when the temperature reaches about 70ºC Tempering is carried out at temperatures between 150-200 ° C. Tempering there is no significant drop in hardness, but ensures better resistance to fracture and the formation of cracks in the surface in retífica. Temperability Curves of information contained in this catalogue are indicative, depending on the characteristics of the raw material and the test conditions.
Nitriding: Steel can be nitrided to increase the wear resistance of surface hardening. The maximum hardness depends on the heat treatment condition. Performance elements before nitriding have better hardening characteristics leading to the next maximum hardness of 800 HV. Tempering depth of between 0.30 and 0.60 mm and white layer not less than 10 mm are recommended.
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