Common steel boriding and quenching combined treatment process

A composite treatment, general-purpose steel technology, applied in the field of heat treatment, can solve the problems of increased heat treatment processing costs, low versatility, etc., to prevent spalling, prolong service life, and reduce brittleness.

Inactive Publication Date: 2014-11-19

广州市广智机电工业研究所有限公司

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AI-Extracted Technical Summary

Problems solved by technology

[0014] Among the relevant patents or papers published above, some are researching new boronizing agent formulations, or simulating carburizing and other controlled atmosphere furnaces to adopt instillation bo...

Abstract

The invention relates to a common steel boriding and quenching combined treatment process which comprises the following steps: cleaning a workpiece, preheating and drying; putting the workpiece into a container filled with a boriding agent, putting the container into a heat treatment furnace, and segmentally heating to a constant boriding temperature; heating or cooling to the quenching temperature of the workpiece in the furnace; discharging the workpiece from the furnace and directly quenching; tempering. The process has the beneficial effects that the boronized workpiece in the container is not discharged from the furnace, is heated or cooled to the quenching temperature and then is discharged from the furnace and directly quenched; boriding and quenching are combined for use, the workpiece is directly heated in the furnace, and a single Fe2B structure can be obtained, so that the structure property can be improved, the brittleness is reduced, and the stripping is prevented; a boriding layer is metallurgically bonded with a base body, so that the service life of the workpiece is prolonged; moreover, the process is suitable for boriding treatment of existing most steel and iron and is very good in commonality. The process can be applied to boriding and quenching of common steel.

Application Domain

Solid state diffusion coating

Technology Topic

QuenchingBrittleness +2

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Examples

Experimental program(3)

Example Embodiment

[0035] Example 1

[0036] The boronizing and quenching composite treatment process of hot work die steel H13 (4Cr5MoSiV1) includes the following steps:

[0037] (1) Clean and preheat the commonly used hot work die steel H13 workpiece, keep it at 100°C for 1h and dry it, place it in a container filled with solid powdery boronizing agent, and send it to the RJ or FXL heat treatment furnace;

[0038] (2) Raise the furnace temperature to 200℃ and keep it for 3 hours;

[0039] (3) Raise the furnace temperature to 550~600℃ at a temperature of 60~70℃/h and keep it for 4h;

[0040] (4) Raise the furnace temperature to 1000°C at a temperature of 60~70°C/h and keep it for 6h;

[0041] (5) Quenching: Lift out the workpiece and quench it out of the furnace;

[0042] (6) Tempering: Tempering at 560°C for 2 to 3 times.

[0043] The boronizing temperature of hot work die steel H13, Cr12MoV, Cr12, 2Cr13 is very close to the quenching temperature, so it is directly boronized and quenched at 1000℃. The surface metallographic diagram after this process is shown figure 2 Its performance is shown in the following table 1. HV in the table refers to the hardness value measured after a load of 200g and a load of 15s (the same below):

[0044] Table 1

[0045]

Example Embodiment

[0046] Example 2

[0047] The boronizing and quenching composite treatment process of medium carbon quenched and tempered steel 40Cr includes the following steps:

[0048] (1) Clean and preheat the commonly used medium-carbon quenched and tempered steel 40Cr workpiece, heat it at 200℃ for 2h and dry it, put it in a container filled with solid powdery boronizing agent, and send it to the RJ or FXL heat treatment furnace ;

[0049] (2) Raise the furnace temperature to 200℃ and keep it for 3 hours;

[0050] (3) Raise the furnace temperature to 550~600℃ at a temperature of 70~80℃/h, and keep it for 4h;

[0051] (4) Raise the furnace temperature to 930~1000℃ at a temperature of 70~80℃/h, and keep it for 6h;

[0052] (5) Lower the furnace temperature to 850°C and keep it for 2~3h;

[0053] (6) Quenching: Lift out the workpiece and quench it out of the furnace;

[0054] (7) Tempering: 1 to 2 times at low temperature of 200℃.

[0055] The surface metallographic diagram after this process is shown image 3 , Its performance is shown in Table 2:

[0056] Table 2

[0057]

Example Embodiment

[0058] Example 3

[0059] The compound treatment process of boriding and quenching of niobium-containing high speed steel 65Nb includes the following steps:

[0060] (1) Clean and preheat the niobium-containing high-speed steel 65Nb (65Cr4W3Mo2VNb) workpiece, heat it at 150℃ for 1.5h and dry it, place it in a container filled with solid powdery boronizing agent, and send it to RJ or FXL heat treatment In the furnace

[0061] (2) Raise the furnace temperature to 200℃ and keep it for 3 hours;

[0062] (3) Raise the furnace temperature to 550~600℃ at a temperature of 50~60℃/h, and keep it for 4h;

[0063] (4) Raise the furnace temperature to 930℃~1000 at a temperature of 50~60℃/h, and keep it for 6h.

[0064] (5) Slowly increase the furnace temperature to 1080℃~1100℃ and keep it for 2~3h;

[0065] (6) Quenching: Lift out the workpiece and quench it out of the furnace;

[0066] (7) Tempering: Tempering 3 times at 560℃.

[0067] The surface metallographic diagram after this process is shown Figure 4 , Its performance is shown in Table 3:

[0068] table 3

[0069]

[0070] After the three materials of the above three embodiments are subjected to the composite treatment of boronizing and quenching, the surface hardness is greatly improved, and the wear resistance is greatly improved. For many customers in actual production, including die steel (H13, 3Cr2W8, Cr12, Cr12MoV, etc.), stainless steel (2Cr13, 1Cr18Ni9Ti, etc.), carbon steel (A3, 45, T10, etc.), alloy steel (40Cr, 42CrMo, etc.), tools Steel (GCr15, 9SiCr, etc.), high-speed steel (65Nb, W18Cr4V, etc.), cast iron and other workpieces, reasonable arrangements for boronizing in the same furnace, separate quenching and tempering, all meet the performance requirements.

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Classification and recommendation of technical efficacy words

reduce brittleness

Common steel boriding and quenching combined treatment process

A composite treatment, general-purpose steel technology, applied in the field of heat treatment, can solve the problems of increased heat treatment processing costs, low versatility, etc., to prevent spalling, prolong service life, and reduce brittleness.

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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