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Rapid superficial layer carburizing process for prepared carbon potential of large- and medium-scale furnace body

A large and medium-sized, carbon-potential technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of difficult control of layer depth, low hardness, large fluctuation of effective hardened layer, etc., and achieve low cost , high utilization rate of equipment, and stable quality of seepage layer

Inactive Publication Date: 2011-04-13
CRRC QISHUYAN CO LTD
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  • Description
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Problems solved by technology

[0003] In order to overcome the deficiencies of the existing technical layer depth, which are difficult to control, low hardness, and large fluctuations in the effective hardened layer, the present invention provides a rapid shallow carburizing process for preparing carbon potential in large and medium-sized furnaces

Method used

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  • Rapid superficial layer carburizing process for prepared carbon potential of large- and medium-scale furnace body
  • Rapid superficial layer carburizing process for prepared carbon potential of large- and medium-scale furnace body

Examples

Experimental program
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Effect test

Embodiment

[0021] Steel parts made of 20CrMn

[0022] Part Name: Screw Ball Seat

[0023] Material: 20CrMn

[0024] Technical requirements: carburized layer depth 0.5 ~ 0.7mm

[0025] Surface hardness: 59~63HRC

[0026] Hardness in quenching depth: 550HV1

[0027] Preset carbon potential: 1.0~1.2

[0028] Carburizing temperature: 850~880℃

[0029] Carburizing time: 90-120min, adjust to reduce carbon potential before firing

[0030] After carburizing and quenching, the surface hardness is 62~64HRC

[0031] After tempering, the surface hardness is 61~62HRC

[0032] Effective hardened layer depth 0.70mm

[0033] The distribution of the effective hardened layer is shown in the appendix figure 1 .

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Abstract

The invention relates to the technical field of carburizing processes for steel workpieces, in particular to a rapid superficial layer carburizing process for the prepared carbon potential of a large- and medium-layer furnace body. The process comprises the following steps of: controlling the preparing carbon potential of a steel workpiece at the carburizing temperature of 800 DEG C-900 DEG C, controlling the proportion of the strong carburizing period and the spreading period of the steel workpiece, and controlling baked carbon potential retraction of the steel workpiece to obtain the expected depth and tissue of a carburizing layer, thereby effectively controlling the quality of the steel workpiece. The invention has the significance of breaking through the blind spot that the superficial layer carburizing with common carburizing depth of the large- and medium-scale equipment is controlled above 1.2mm and below 0.9mm is difficult to relate and control by using the large- and medium-scale equipment, meanwhile, the process opens up a simple and practical way for the superficial layer carburizing of the large- and medium-scale equipment.

Description

technical field [0001] The invention relates to the technical field of carburizing technology for iron and steel workpieces, in particular to a rapid shallow carburizing technology for preparing carbon potential in large and medium-sized furnace bodies. Background technique [0002] Because it is difficult to establish and control the carburizing atmosphere in the shallow layer of the large furnace body, the effect of thin layer carburizing is unstable, which will lead to a: the depth of the layer reaches the range requirement, but it is difficult to form a sufficiently high carbon content on the surface after shallow carburizing, As a result, the post-quenching hardness is not enough (lower than the lower limit required, about 52HRC or lower, or even quenched); b: In order to ensure the surface carbon concentration, the depth of the layer is difficult to control, and it drifts to about 1mm or higher. Due to the limitations of the above-mentioned equipment conditions and pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22
Inventor 潘晓松
Owner CRRC QISHUYAN CO LTD
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