Heat treatment technology of 20CrMnMoA steel bevel gear shaft

Abstract

The invention provides a heat treatment technology of a 20CrMnMoA steel bevel gear shaft. the bevel gear shaft comprises the following chemical elements (by weight): 0.17-0.23% of C, 0.17-0.37% of Si,0.8-1.3% of Mn, 1.0-1.3% of Cr, 0.04-0.12% of Ti, 0.20-0.30% of Mo, Ni being less than 0.03%, Cu being less than 0.03%, P being less than 0.035%, S being less than 0.035%, and the balance iron. Through anticarburizing treatment, carburization, thermal insulation, two-stage quenching, normalization and tempering and then through machining, the 20CrMnMoA steel bevel gear shaft with high strength, high impact toughness and high tensile property is prepared.

Description

technical field

[0001] The invention relates to the technical field of processing mechanical parts, in particular to a heat treatment process for a 20CrMnMoA steel bevel gear shaft. Background technique

[0002] In recent years, with the development of the national economy, the demand for shafts and bevel gear shaft parts has increased, and their life and load capacity directly affect the economic benefits of machinery manufacturers. Capacity and service life are increasingly important in the machinery industry. Commonly used bevel gear shafts, shafts and carburized parts need to be forged, cut, and then subjected to heat treatment such as normalizing, carburizing and quenching, and low-temperature tempering to obtain a hard carburized layer on the shallow surface and a good carburized layer on the center. The organization with comprehensive mechanical properties, the structure contains martensite, retained austenite and massive carbide, etc. These organizations and the res...

Examples

Embodiment 1

[0024] A heat treatment process for a 20CrMnMoA steel bevel gear shaft, the chemical element composition and mass percentage of the 20CrMnMoA steel bevel gear shaft are: C: 0.17%, Si: 0.17%, Mn: 0.8%, Cr: 1.0%, Ti: 0.04 %, Mo: 0.20%, Ni<0.03%, Cu<0.03%, P<0.035%, S<0.035%, the balance is iron, and the heat treatment process includes the following steps:

[0025] S1: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 920-930 ° C, put the bevel 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 830±10℃ after meeting the requirements;

[0026] S2: heat preservation: heat preservation and soaking for 2 hours;

[0027] S3: two-stage quenching: immerse the bevel gear shaft vertically in calcium chloride solution at a temperature between 820-850 °C, rapidly cool the bevel gear shaft ...

Embodiment 2

[0033] A heat treatment process for a 20CrMnMoA steel bevel gear shaft, the chemical element composition and mass percentage of the 20CrMnMoA steel bevel gear shaft are: C: 0.23%, Si: 0.37%, Mn: 1.3%, Cr: 1.3%, Ti: 0.12 %, Mo: 0.30%, Ni<0.03%, Cu<0.03%, P<0.035%, S<0.035%, the balance is iron, and the heat treatment process includes the following steps:

[0034] S1: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 920-930 ° C, put the bevel 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 830±10℃ after meeting the requirements;

[0035] S2: heat preservation: heat preservation and soaking for 2 hours;

[0036] S3: two-stage quenching: immerse the bevel gear shaft vertically in calcium chloride solution at a temperature between 820-850 °C, rapidly cool the bevel gear shaft ...

Embodiment 3

[0042]A heat treatment process for a 20CrMnMoA steel bevel gear shaft, the chemical element composition and mass percentage of the 20CrMnMoA steel bevel gear shaft are: C: 0.21%, Si: 0.26%, Mn: 0.11%, Cr: 1.2%, Ti: 0.08 %, Mo: 0.25%, Ni<0.03%, Cu<0.03%, P<0.035%, S<0.035%, the balance is iron, and the heat treatment process includes the following steps:

[0043] S1: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 920-930 ° C, put the bevel 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 830±10℃ after meeting the requirements;

[0044] S2: heat preservation: heat preservation and soaking for 2 hours;

[0045] S3: two-stage quenching: immerse the bevel gear shaft vertically in the calcium chloride solution at a temperature between 820-850 °C, rapidly cool the bevel gear sh...

technical field

[0001] The invention relates to the technical field of processing mechanical parts, in particular to a heat treatment process for a 20CrMnMoA steel bevel gear shaft. Background technique

[0002] In recent years, with the development of the national economy, the demand for shafts and bevel gear shaft parts has increased, and their life and load capacity directly affect the economic benefits of machinery manufacturers. Capacity and service life are increasingly important in the machinery industry. Commonly used bevel gear shafts, shafts and carburized parts need to be forged, cut, and then subjected to heat treatment such as normalizing, carburizing and quenching, and low-temperature tempering to obtain a hard carburized layer on the shallow surface and a good carburized layer on the center. The organization with comprehensive mechanical properties, the structure contains martensite, retained austenite and massive carbide, etc. These organizations and the res...

Examples

Embodiment 1

[0024] A heat treatment process for a 20CrMnMoA steel bevel gear shaft, the chemical element composition and mass percentage of the 20CrMnMoA steel bevel gear shaft are: C: 0.17%, Si: 0.17%, Mn: 0.8%, Cr: 1.0%, Ti: 0.04 %, Mo: 0.20%, Ni<0.03%, Cu<0.03%, P<0.035%, S<0.035%, the balance is iron, and the heat treatment process includes the following steps:

[0025] S1: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 920-930 ° C, put the bevel 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 830±10℃ after meeting the requirements;

[0026] S2: heat preservation: heat preservation and soaking for 2 hours;

[0027] S3: two-stage quenching: immerse the bevel gear shaft vertically in calcium chloride solution at a temperature between 820-850 °C, rapidly cool the bevel gear shaft ...

Embodiment 2

[0033] A heat treatment process for a 20CrMnMoA steel bevel gear shaft, the chemical element composition and mass percentage of the 20CrMnMoA steel bevel gear shaft are: C: 0.23%, Si: 0.37%, Mn: 1.3%, Cr: 1.3%, Ti: 0.12 %, Mo: 0.30%, Ni<0.03%, Cu<0.03%, P<0.035%, S<0.035%, the balance is iron, and the heat treatment process includes the following steps:

[0034] S1: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 920-930 ° C, put the bevel 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 830±10℃ after meeting the requirements;

[0035] S2: heat preservation: heat preservation and soaking for 2 hours;

[0036] S3: two-stage quenching: immerse the bevel gear shaft vertically in calcium chloride solution at a temperature between 820-850 °C, rapidly cool the bevel gear shaft ...

Embodiment 3

[0042]A heat treatment process for a 20CrMnMoA steel bevel gear shaft, the chemical element composition and mass percentage of the 20CrMnMoA steel bevel gear shaft are: C: 0.21%, Si: 0.26%, Mn: 0.11%, Cr: 1.2%, Ti: 0.08 %, Mo: 0.25%, Ni<0.03%, Cu<0.03%, P<0.035%, S<0.035%, the balance is iron, and the heat treatment process includes the following steps:

[0043] S1: Carburizing: Use the method of heating to high temperature. After the gas carburizing furnace is heated to 920-930 ° C, put the bevel 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 830±10℃ after meeting the requirements;

[0044] S2: heat preservation: heat preservation and soaking for 2 hours;

[0045] S3: two-stage quenching: immerse the bevel gear shaft vertically in the calcium chloride solution at a temperature between 820-850 °C, rapidly cool the bevel gear sh...

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