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High-strength nut heat treatment technology

A high-strength nut and process technology, applied in heat treatment baths, heat treatment furnaces, heat treatment equipment, etc., can solve the problems of increased scrap rate, lower matching rate, and larger section shrinkage rate, and achieve reduced scrap rate and matching rate. High, small reduction in area of ​​the nut

Inactive Publication Date: 2014-04-30
常熟市福熙机械零部件制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The heat treatment process of nuts with high strength requirements is usually processed by carburizing or cyaniding plus quenching and tempering. The annealing is carried out at 850-900 ° C and kept for 10 hours, but the reduction of area of ​​the nut becomes larger during quenching, and the matching rate becomes lower. , the scrap rate becomes larger

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A heat treatment process for high-strength nuts, comprising the steps of:

[0015] 1) Preheat the nuts to be processed for 4 hours, and the temperature of the preheating furnace is 350°C;

[0016] 2) Then keep it in a salt bath furnace at 710°C for 1.5 hours for quenching. The salt solution uses sodium chloride with a concentration of 120g / L, potassium chloride with a concentration of 140g / L, sodium sulfate with a concentration of 180g / L and a concentration of Be the mixed solution of the potassium nitrate of 160g / L;

[0017] 3) In the first stage of quenching, nitrate is used for constant temperature quenching to 405°C. The nitrate quenching agent is a quenching agent mixed with potassium nitrate and sodium nitrate in a mass ratio of 3:1;

[0018] 4) Quenching in the second stage, using 125°C hot water to quench to 165°C;

[0019] 5) Keep warm in a tempering furnace at 405°C for 2 hours, then air cool to room temperature.

Embodiment 2

[0021] A heat treatment process for high-strength nuts, comprising the steps of:

[0022] 1) Preheat the nuts to be processed for 3 hours, and the temperature of the preheating furnace is 340°C;

[0023] 2) Then keep it in a salt bath furnace at 700°C for 1 hour for quenching. The salt solution uses sodium chloride with a concentration of 100g / L, potassium chloride with a concentration of 130g / L, sodium sulfate with a concentration of 150g / L and a concentration of Be the mixed solution of the potassium nitrate of 140g / L;

[0024] 3) In the first stage of quenching, nitrate is used for constant temperature quenching to 400°C. The nitrate quenching agent is a quenching agent mixed with potassium nitrate and sodium nitrate at a mass ratio of 3:1;

[0025] 4) Quenching in the second stage, using 120°C hot water to quench to 160°C;

[0026] 5) Keep warm in a tempering furnace at 400°C for 1 hour, then air cool to room temperature.

Embodiment 3

[0028] A heat treatment process for high-strength nuts, comprising the steps of:

[0029] 1) Preheat the nuts to be processed for 3.5 hours, and the temperature of the preheating furnace is 344°C;

[0030] 2) Then keep it in a salt bath furnace at 707°C for 1.2 hours for quenching. The salt solution uses sodium chloride with a concentration of 108g / L, potassium chloride with a concentration of 133g / L, sodium sulfate with a concentration of 158g / L and a concentration of Be the mixed solution of the potassium nitrate of 147g / L;

[0031] 3) In the first stage of quenching, nitrate is used for constant temperature quenching to 403°C. The nitrate quenching agent is a quenching agent mixed with potassium nitrate and sodium nitrate at a mass ratio of 3:1;

[0032] 4) Quenching in the second stage, using 122°C hot water to quench to 164°C;

[0033] 5) Keep warm in a tempering furnace at 404°C for 1.5 hours, then air cool to room temperature.

[0034]

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PUM

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Abstract

The invention discloses a high-strength nut heat treatment technology which comprises the following steps: 1) preheating a to-be-treated nut for 3-4 hours with the preheating furnace temperature of 340-350 DEG C; 2) keeping warm in a salt bath furnace at 700-710 DEG C for 1-1.5 hours for quenching with a salt solution being a mixed solution of sodium chloride with a concentration of 100-120g / L, potassium chloride with a concentration of 130-140g / L, sodium sulfate with a concentration of 150-180g / L of and potassium nitrate with a concentration of 140-160g / L; 3) performing first stage quenching, using nitrate salt for isothermal quenching to 400-405 DEG C, wherein a nitrate salt quenching agent is a quenching agent with a mass ratio of potassium nitrate to sodium nitrate being 3:1; 4) performing second stage quenching, using hot water of 120-125 DEG C for quenching to 160-165 DEG C; 5) keeping warm in a tempering furnace of 400-405 DEG C for 1 to 2 hours, and then cooling by air to room temperature. According to the high-strength nut heat treatment technology, the treated nut is less in fracture surface shrinkage, high in cooperation rate and low in rejection rate, and the use of a cyanide impregnation agent harmful to human body and environment can be avoided.

Description

technical field [0001] The invention relates to a heat treatment process for high-strength nuts. Background technique [0002] The heat treatment process of nuts with high strength requirements is usually processed by carburizing or cyaniding plus quenching and tempering. The annealing is carried out at 850-900 ° C and kept for 10 hours, but the reduction of area of ​​the nut becomes larger during quenching, and the matching rate becomes lower. , the scrap rate becomes larger. Contents of the invention [0003] The object of the present invention is to provide a heat treatment process for high-strength nuts, which has a small reduction in area, a high compounding rate, a reduced reject rate, and avoids the use of cyanide penetrating agents harmful to the human body and the environment. [0004] In order to achieve the above object, the technical solution of the present invention is to design a heat treatment process for high-strength nuts, comprising the steps of: [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/19C21D1/607C21D1/50C21D9/00
Inventor 查希炜查清源
Owner 常熟市福熙机械零部件制造有限公司