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Vacuum carburizing heat treatment process for low-carbon high-alloy steel

A technology of vacuum carburizing and high-alloy steel, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., to achieve the effects of improving diffusion efficiency, accelerating carburizing speed, and reducing internal and external temperature differences

Pending Publication Date: 2022-01-11
SHANGHAI FENGDONG HEAT TREATMENT ENGINEERING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned vacuum carburizing technology still needs to be improved to further increase production efficiency

Method used

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  • Vacuum carburizing heat treatment process for low-carbon high-alloy steel

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Effect test

Embodiment 1

[0050] A low-carbon high-alloy steel vacuum carburizing heat treatment process, comprising the following steps:

[0051] S1. Pre-cleaning stage: Put the workpiece into the vacuum immersion cleaning machine, and clean it with a degreasing hydrocarbon cleaning agent. The cleaning temperature is 110°C. After cleaning the oil stains on the surface of the workpiece, take it out;

[0052] S2. The first stage of uniform temperature: put the workpiece into the heating chamber of the vacuum carburizing oil quenching furnace, heat it to 845 ° C, and keep it for 90 minutes;

[0053]S3, the second stage of uniform temperature: heat the vacuum carburizing oil quenching furnace to 985°C and keep it for 100min;

[0054] S4. Carburizing stage: keep the temperature of the vacuum carburizing oil quenching furnace at 985°C, continuously feed acetylene into the vacuum carburizing oil quenching furnace, and the flow rate of acetylene is 14L / min. Vacuum the carbon oil quenching furnace and keep it...

Embodiment 2

[0062] A low-carbon high-alloy steel vacuum carburizing heat treatment process, comprising the following steps:

[0063] S1. Pre-cleaning stage: Put the workpiece into a vacuum immersion cleaning machine, and clean it with a degreasing hydrocarbon cleaning agent. The cleaning temperature is 120 ° C. After cleaning the oil stains on the surface of the workpiece, take it out;

[0064] S2. The first stage of uniform temperature: put the workpiece into the heating chamber of the vacuum carburizing oil quenching furnace, heat it to 855°C, and keep it for 110min;

[0065] S3, the second stage of uniform temperature: heat the vacuum carburizing oil quenching furnace to 980°C and keep it for 90min;

[0066] S4. Carburizing stage: keep the temperature of the vacuum carburizing oil quenching furnace at 980°C, continuously feed acetylene into the vacuum carburizing oil quenching furnace, and the flow rate of acetylene is 13L / min. Vacuum the carbon oil quenching furnace and keep it for 2...

Embodiment 3

[0074] A low-carbon high-alloy steel vacuum carburizing heat treatment process, comprising the following steps:

[0075] S1. Pre-cleaning stage: Put the workpiece into a vacuum immersion cleaning machine, and clean it with a degreasing hydrocarbon cleaning agent. The cleaning temperature is 130°C. Clean the oil stains on the surface of the workpiece and take it out;

[0076] S2. The first stage of uniform temperature: put the workpiece into the heating chamber of the vacuum carburizing oil quenching furnace, heat it to 850°C, and keep it for 100min;

[0077] S3, the second stage of uniform temperature: heat the vacuum carburizing oil quenching furnace to 975°C and keep it for 110min;

[0078] S4. Carburizing stage: keep the temperature of the vacuum carburizing oil quenching furnace at 975°C, and continuously feed acetylene into the vacuum carburizing oil quenching furnace. The flow rate of acetylene is 15L / min. Vacuum the carbon oil quenching furnace and keep it for 205 minu...

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Abstract

The invention relates to the field of vacuum heat treatment, and particularly discloses a vacuum carburizing heat treatment process for low-carbon high-alloy steel. The process comprises the following steps of entering a carburizing stage, heating a vacuum carburizing furnace filled with a workpiece to 975-985 DEG C, continuously introducing acetylene into the vacuum carburizing furnace, keeping for 17-20 minutes, stopping introducing the acetylene, vacuumizing the vacuum carburizing furnace, and keeping for 200-210 minutes; and repeating the carburizing stage for at least two times, and then entering a cooling stage. The process has the effect of further improving the vacuum carburizing production efficiency.

Description

technical field [0001] The present application relates to the field of vacuum heat treatment, more specifically, it relates to a low-carbon high-alloy steel vacuum carburizing heat treatment process. Background technique [0002] Carburizing is a common heat treatment process. The low-carbon steel or low-carbon alloy steel workpiece is placed in an active carburizing medium, and after heating to the single-phase austenite zone for a certain period of time, the activated carbon in the carburizing medium Atoms infiltrate into the surface of the steel part to obtain a workpiece with high carbon on the surface and low carbon in the core, so that the surface of the workpiece has high hardness and wear resistance, while the core maintains the toughness and plasticity of low carbon steel. [0003] The traditional controllable atmosphere carburizing is affected by the performance of the equipment. Generally, the maximum operating temperature is 950°C, the carburizing speed is slow, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22C23C8/80C21D1/18C21D1/773C23F17/00
CPCC23C8/22C23C8/80C21D1/18C21D1/773C23F17/00C21D2211/008
Inventor 董政
Owner SHANGHAI FENGDONG HEAT TREATMENT ENGINEERING CO LTD
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