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Heat-resistance bolt heat treatment process

A bolt and heat-resistant technology, applied in heat treatment baths, heat treatment furnaces, heat treatment equipment, etc., can solve the problems of unfavorable enterprises, standing out, and rising cost of heat treatment bolts, and achieve the effect of simple process, low cost, and improvement of enterprise competitiveness

Inactive Publication Date: 2018-11-13
临汾市汇友创电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the current preparation process of heat-resistant bolts more complicated, especially in the heat treatment process, which leads to an increase in the cost of heat-treated bolts, which is not conducive to companies standing out in the fierce market competition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A heat treatment process for heat-resistant bolts, comprising the following steps:

[0021] S1, select 0Cr15Ni25Ti2MoIVB steel, make it into a steel column to prepare heat-resistant bolts as raw materials;

[0022] S2. Put the steel column into a well-type carburizing furnace, heat it to 990°C, and keep it warm for 1.5 hours. Nitrogen is used as the protective gas during the heating process;

[0023] After the holding time in S3 and S2 is reached, cool it in the furnace to 840°C, keep it for 3.5 hours, then cool it to 500°C with the furnace, and then take it out for air cooling;

[0024] S4. Heat the steel column to 740°C, keep it warm for 2.5 hours, then cool it to 500°C with the furnace, and take it out for air cooling;

[0025] S5, processing the steel column into bolts according to the design size;

[0026] S6. Heat the bolt to 1100°C under nitrogen protection, keep it for 16 minutes, then take out the oil and cool it, repeat 2 times;

[0027] S7. Heat the bolt t...

Embodiment 2

[0029] A heat treatment process for heat-resistant bolts, comprising the following steps:

[0030] S1, select 0Cr15Ni25Ti2MoIVB steel, make it into a steel column to prepare heat-resistant bolts as raw materials;

[0031] S2. Put the steel column into a well-type carburizing heating furnace, and heat it to 980°C, keep it warm for 2 hours, and use nitrogen as the protective gas during the heating process;

[0032] After the holding time in S3 and S2 is reached, cool to 850°C in the furnace, keep it for 3 hours, then cool to 480°C with the furnace, and then take it out for air cooling;

[0033] S4. Heat the steel column to 720°C, keep it warm for 3 hours, then cool it to 480°C with the furnace, and then take it out for air cooling;

[0034] S5, processing the steel column into bolts according to the design size;

[0035] S6,, the weight and number ratio is the barium chloride of 56, the sodium chloride of 21, the Mg of 18 (BF 4 ) 2 Mix to obtain mixed salt, then heat the mix...

Embodiment 3

[0038] A heat treatment process for heat-resistant bolts, comprising the following steps:

[0039] S1, select 0Cr15Ni25Ti2MoIVB steel, make it into a steel column to prepare heat-resistant bolts as raw materials;

[0040] S2. Put the steel column into the well-type carburizing heating furnace, and heat it to 1000°C, keep it warm for 1-2 hours, and use nitrogen as the protective gas during the heating process;

[0041] After the holding time in S3 and S2 is reached, cool it to 830°C in the furnace, keep it for 3 hours, then cool it to 450°C with the furnace, and then take it out for air cooling;

[0042] S4. Heat the steel column to 730°C, keep it warm for 3 hours, then cool it to 450°C with the furnace, and then take it out for air cooling;

[0043] S5, processing the steel column into bolts according to the design size;

[0044] S6. Heat the bolt to 1200°C under nitrogen protection, keep it for 15 minutes, then take out the oil and cool it, repeat 2 times;

[0045] S7. Tak...

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Abstract

The invention discloses a heat-resistance bolt heat treatment process. The heat-resistance bolt heat treatment process comprises the following steps: (S1) 0Cr15Ni25Ti2MoIVB steel is selected to manufacture steel columns as raw materials for preparation of heat-resistance bolts; (S2) the steel columns are put in well carbonization heating furnace, and are heated to 950-1000 DEG C for insulation by1-2 hours; and nitrogen is adopted as protective gas in the heating process; (S3) after the insulation time is reached in the step (S2), the steel columns are cooled to 830-850 DEG C in the furnace for insulation by 3-4 hours, and are cooled to 450-500 DEG C along with the furnace for air cooling; (S4) the steel columns are heated to 720-750 DEG C for insulation by 2-3 hours, and are cooled to 450-500 DEG C along with the furnace for air cooling; (S5) the steel columns are machined as bolts according to designed sizes; (S6) the bolts are heated to 1000-1200 DEG C under nitrogen protection forinsulation by 15-20 minutes, and are taken out for oil cooling; and the operation is repeated by 2-4 times; and (S7) the bolts treated in the step (S6) are heated to 720-750 DEG C; nitrogen is introduced as protective gas; and the bolts are insulated by 12-18 hours, and are taken out for air cooling. The heat-resistance bolt heat treatment process is simple in procedure and lower in cost; and theperformances of finished products are not second to traditional mainstream products.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a heat treatment process for heat-resistant bolts. Background technique [0002] The heat treatment process is often used in metal products, mainly to change the internal structure of the metal, so that it can produce different properties, such as hardening by quenching, softening by annealing, and stress relief by normalizing. Especially common in steel parts. [0003] The bolt is a connection pair with teeth, and the heat-resistant bolt must not only bear high temperature and alternating load, but also be used under the premise of maintaining the pre-tightening force and fatigue strength to a considerable extent, usually at about 600 °C normal use in the environment. [0004] Heat-resistant bolts are required to maintain high strength, hardness and good toughness at high temperatures, but also have good relaxation resistance, high temperature stability, pig dog strength, low notch ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/76C21D1/58C21D1/46C21D6/00C21D9/00
CPCC21D1/76C21D1/46C21D1/58C21D6/004C21D9/005C21D9/0068
Inventor 段全家李明
Owner 临汾市汇友创电子科技有限公司
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