Thermal treatment process of 20CrMnTi-steel passive helical gear shaft of differential gear
A technology for gear shafts and differentials, which is applied in the field of heat treatment of differential 20CrMnTi steel passive helical gear shafts, can solve the problems that the strength, hardness and toughness cannot meet the requirements of use, achieve high organizational order, and reduce quenching The effect of cracks and fine grains
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Embodiment 1
[0022] A heat treatment process for a differential 20CrMnTi steel passive helical gear shaft, the chemical element composition and mass percentage of the 20CrMnTi steel passive helical gear shaft are: C: 0.18%, Si: 0.25%, Mn: 0.5%, Cr: 1.2 %, Ti: 0.02%, P<0.04%, S<0.04%, the balance is iron, and the heat treatment process includes the following steps:
[0023] S1: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 900-920°C, put the passive helical gear shaft vertically into the furnace, exhaust, keep warm for 2.5 hours, and drop 160-180 drops of kerosene during the heat preservation / min, the temperature of the infiltrated layer will drop to 820±10℃ after meeting the requirements;
[0024] S2: heat preservation: heat preservation and soaking for 2 hours;
[0025] S3: two-stage quenching: immerse the passive helical gear shaft vertically in the calcium chloride solution at a temperature between 810 and 830 degrees Celsiu...
Embodiment 2
[0031] A heat treatment process for a differential 20CrMnTi steel passive helical gear shaft, the chemical element composition and mass percentage of the 20CrMnTi steel passive helical gear shaft are: C: 0.22%, Si: 0.3%, Mn: 0.9%, Cr: 2.0 %, Ti: 0.08%, P<0.04%, S<0.04%, the balance is iron, and the heat treatment process includes the following steps:
[0032] S1: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 900-920 ° C, put the passive helical gear shaft vertically into the furnace, exhaust, keep warm for 2.5 hours, and drop 160-180 kerosene during the heat preservation Drops / min, the temperature of the infiltration layer will drop to 820±10℃ after meeting the requirements;
[0033] S2: heat preservation: heat preservation and soaking for 2 hours;
[0034] S3: two-stage quenching: immerse the passive helical gear shaft vertically in the calcium chloride solution at a temperature between 810 and 830 degrees Celsius,...
Embodiment 3
[0040] A heat treatment process for a differential 20CrMnTi steel passive helical gear shaft, the chemical element composition and mass percentage of the 20CrMnTi steel passive helical gear shaft are: C: 0.20%, Si: 0.28%, Mn: 0.7%, Cr: 1.6 %, Ti: 0.06%, P<0.04%, S<0.04%, the balance is iron, and the heat treatment process includes the following steps:
[0041]S1: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 900-920 ° C, put the passive helical gear shaft vertically into the furnace, exhaust, keep warm for 2.5 hours, and drop 160-180 kerosene during the heat preservation Drops / min, the temperature of the infiltration layer will drop to 820±10℃ after meeting the requirements;
[0042] S2: heat preservation: heat preservation and soaking for 2 hours;
[0043] S3: two-stage quenching: immerse the passive helical gear shaft vertically in the calcium chloride solution at a temperature between 810 and 830 degrees Celsius,...
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