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Low-temperature normalizing heat treatment method for No.45 steel

A technology of normalizing heat treatment and No. 45 steel, which is applied in the field of heat treatment, can solve the problems of long normalizing time, narrow temperature range of heat treatment process, and low efficiency, and achieve the effects of reducing holding time, improving normalizing efficiency, and improving overall performance

Inactive Publication Date: 2018-12-18
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problems of the current normalizing heat treatment process of No. 45 steel, such as narrow heat treatment temperature range, long normalizing time and low efficiency, and the need to further improve the normalizing structure and properties of No. 45 steel

Method used

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  • Low-temperature normalizing heat treatment method for No.45 steel
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  • Low-temperature normalizing heat treatment method for No.45 steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of No. 45 steel low temperature normalizing heat treatment method, it comprises the steps:

[0039] (1) Raise the temperature of the salt bath in the salt bath furnace to 800°C and keep it warm. The salt bath medium is a neutral salt bath, the composition is 50% KCl+50% NaCl, and the use temperature is between 720-950°C.

[0040] (2) Put the 45 steel workpiece into the salt bath salt solution to keep warm, and the maximum thickness of the workpiece is 12mm.

[0041] (3) After the temperature of the workpiece rises to the temperature of the salt bath, the ultrasonic tool head will be closely connected with the surface of the workpiece, the ultrasonic wave will be turned on, and the ultrasonic vibration will be directly transmitted into the workpiece matrix. The ultrasonic frequency range is 40KHZ; the ultrasonic intensity is 15W / cm 2 , heat preservation ultrasonic treatment time is 12min;

[0042] (4) Turn off the ultrasonic and take out the ultrasonic tool he...

Embodiment 2

[0044] A kind of No. 45 steel low temperature normalizing heat treatment method, it comprises the steps:

[0045] (1) Raise the temperature of the salt bath in the salt bath furnace to 830°C and keep it warm. The salt bath medium is a neutral salt bath, the composition is 50% KCl+50% NaCl, and the use temperature is between 720-950°C.

[0046] (2) Put the 45 steel workpiece into the salt bath salt solution to keep warm, and the maximum thickness of the workpiece is 12mm.

[0047] (3) After the temperature of the workpiece rises to the temperature of the salt bath, insert the ultrasonic tool head 1-2cm below the surface of the salt solution above the workpiece, turn on the ultrasound, and directly input the ultrasonic vibration into the salt solution. The ultrasonic frequency range is 30KHZ; the ultrasonic intensity is 10W / cm 2 , heat preservation ultrasonic treatment time is 15min;

[0048] (4) Turn off the ultrasonic and take out the ultrasonic tool head. The workpiece wa...

Embodiment 3

[0050] A kind of No. 45 steel low temperature normalizing heat treatment method, it comprises the steps:

[0051](1) Raise the temperature of the salt bath in the salt bath furnace to 850°C and keep it warm. The salt bath medium is a neutral salt bath, the composition is 50% KCl+50% NaCl, and the use temperature is between 720-950°C.

[0052] (2) Put the 45 steel workpiece into the salt bath salt solution to keep warm, and the maximum thickness of the workpiece is 12mm.

[0053] (3) After the temperature of the workpiece rises to the temperature of the salt bath, the ultrasonic tool head is connected to the salt bath container, the ultrasonic is turned on, and the ultrasonic vibration is directly input into the salt solution. Ultrasonic frequency range is 20KHZ; ultrasonic intensity is 5W / cm 2 , heat preservation ultrasonic treatment time is 18min;

[0054] (4) Turn off the ultrasonic and take out the ultrasonic tool head. The workpiece was taken out of the salt bath furna...

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Abstract

The invention discloses a low-temperature normalizing heat treatment method for No.45 steel, and relates to the technical field of heat treatment. The low-temperature normalizing heat treatment methodincludes the steps of salt bath liquid preheating, workpiece salt bath heat preservation, ultrasonic treatment, air cooling and the like. According to the method, an ultrasonic field with a certain vibrational frequency and power is introduced in the normalizing heat preservation process of the No.45 steel, the normalizing heat preservation temperature can be lowered, heat preservation time required in the austenitizing process is greatly shortened, normalizing efficiency is improved, normalizing heat treatment tissue is improved, and the overall performance of the No.45 steel is also improved.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a low-temperature normalizing heat treatment method for No. 45 steel. Background technique [0002] The heat treatment process is an important basic technology in the machinery industry. Usually, important connecting parts such as shafts, gears, connecting rods and important molds must undergo heat treatment. Moreover, as long as the material selection and heat treatment are appropriate, the parts will be The service life is doubled or even dozens of times increased. If the material selection and heat treatment are done properly each time, the effect of getting twice the result with half the effort can be achieved. Heat treatment is of great significance for exerting the potential performance of metal materials, improving metal quality, saving materials, reducing energy consumption, improving product life, and promoting economic development. [0003] As far as the current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/28C21D1/04C21D1/46C21D6/00
CPCC21D1/28C21D1/04C21D1/46C21D6/00C21D2211/005C21D2211/009
Inventor 陈志浩曹伟朱协彬姚敏
Owner ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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