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Heat treatment carburization process of carburizing steel

A carburizing steel and carburizing technology, which is applied in the field of heat treatment of metal materials, can solve problems such as the inability to meet requirements in service performance, and achieve the effects of avoiding carbide coarsening, increasing carbon content, and improving wear resistance.

Active Publication Date: 2015-06-24
SHANGHAI C&U GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the wear resistance of the product is very high, due to the low content of carbides on the surface of the part (within 0.15mm from the surface), its performance still cannot meet the requirements

Method used

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  • Heat treatment carburization process of carburizing steel
  • Heat treatment carburization process of carburizing steel
  • Heat treatment carburization process of carburizing steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] according to image 3 The process curve diagram is carried out:

[0026] (1) Pre-carburization: Pre-carburize for 1h at 830°C and carbon potential of 1.1;

[0027] (2) Cyclic carburizing: Carburizing at 920°C, carbon potential 1.1 for 3 hours, and then cooling in oil at 100°C; after that, carburizing at 920°C, carbon potential 1.1 for 3 hours, and then at 100°C The process step of cooling in oil is cycled once, thereby completing the cyclic carburization with 2 cycles;

[0028] (3) Diffusion and quenching: use 920 °C, carbon potential 1.0, and carry out carburizing diffusion for 2 hours to obtain a gentle carbon concentration distribution and reduce the stress caused by carburizing heat treatment; after diffusion, cool the temperature to 860 °C, carbon potential 1.0, after holding for 1h, quench and cool in oil at 100℃;

[0029] (4) Tempering: Tempering at 180°C for 3h.

[0030] After completion, use the peeling method to detect the surface carbide content: the carb...

Embodiment 2

[0032] according to Figure 4 The process curve diagram is carried out:

[0033] (1) Pre-carburization: pre-carburize for 2 hours at 800°C and carbon potential of 0.9;

[0034] (2) Cyclic carburizing: Carburizing at 910°C and carbon potential of 0.9 for 1 hour, and then cooling in oil at 50°C; after that, carburizing at 910°C and carbon potential of 0.9 for 1 hour, and then at 50°C for 1 hour. The process step of cooling in oil is cycled once, thereby completing the cyclic carburization with 2 cycles;

[0035] (3) Diffusion and quenching: use 910 °C, carbon potential 1.0, and carry out carburizing diffusion for 2 hours to obtain a gentle carbon concentration distribution and reduce the stress caused by carburizing heat treatment; after diffusion, cool the temperature to 860 °C, carbon potential 1.0, after holding for 1h, quench and cool in oil at 100℃;

[0036] (4) Tempering: Tempering at 180°C for 3h.

[0037] After completion, use the peeling method to detect the surface...

Embodiment 3

[0039] according to Figure 5 The process curve diagram is carried out:

[0040] (1) Pre-carburization: pre-carburize for 3 hours at 840°C with a carbon potential of 1.3;

[0041] (2) Cyclic carburizing: Carburizing at 940°C, carbon potential 1.3 for 4 hours, and then cooling in oil at 130°C; after that, carburizing at 940°C, carbon potential 1.3 for 4 hours, and then at 130°C The process step of cooling in oil is cycled once, thereby completing the cyclic carburization with 2 cycles;

[0042] (3) Diffusion and quenching: use 940°C, carbon potential 1.0, and carry out 2h carburizing diffusion to obtain a gentle carbon concentration distribution and reduce the stress caused by carburizing heat treatment; after diffusion, cool the temperature to 900°C, carbon potential 0.8, after holding for 1h, quench and cool in oil at 100℃;

[0043] (4) Tempering: Tempering at 180°C for 3h.

[0044] After completion, use the peeling method to detect the surface carbide content: the carbid...

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Abstract

The invention relates to a heat treatment carburization process of carburizing steel. The heat treatment carburization process orderly comprises the following steps: pre-carburization (under the conditions of the temperature of 800-840 DEG C, the carbon potential of 0.9-1.3 and the time of 1-3 hours); circulating carburization (under the conditions of the temperature of 910-940 DEG C, the carbon potential of 0.9-1.3 and the time of 1-4 hours, cooling in an oil at the temperature of 50-140 DEG C, and circulating twice); diffusing and quenching (carburizing for diffusion under the conditions of the temperature of 910-940 DEG C, the carbon potential of 0.8-1.0 and the time of 1-3 hours, reducing the temperature to the range of 840-890 DEG C after diffusion, and after retaining the heat at the carbon potential of 0.8-1.0 for 0.5-2 hours, quenching and cooling in the oil at the temperature of 50-140 DEG C); and tempering (at 160-230 DEG C for 2-4 hours). According to the heat treatment carburization process, the special pre-carburization process is added and matched with the circulating carburization, so that lots of fine carbide particles can be formed in the surface carburized layer; the grain size is thinned to grade 9 from grade 7 and the surface wear resistance is greatly improved on the basis of satisfying the properties of the core.

Description

technical field [0001] The invention relates to a heat treatment process for metal materials, specifically a heat treatment carburizing process for carburizing steel. Background technique [0002] Due to the particularity of the working environment of bearing parts, many bearings are required to be able to withstand impact loads, but also require wear resistance. [0003] In order to meet the requirements of the above working conditions, the bearing needs material (carbon steel) to be carburized and heat treated to achieve; carburization: a kind of metal surface treatment, so that the activated carbon atoms decomposed in the carburizing medium penetrate into the surface of the steel part, In this way, the surface layer of high carbon is obtained, and the core still maintains the original composition. This is a common heat treatment process for metal materials, which can make the surface of the carburized workpiece obtain high hardness and improve its wear resistance. [00...

Claims

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Application Information

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IPC IPC(8): C23C8/22C21D1/18C23F17/00
CPCC21D1/18C23C8/22C23F17/00
Inventor 牛玉周胡林林
Owner SHANGHAI C&U GRP CO LTD
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