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Manufacturing method of high-purity spherical pearlite intermediate

A technology of spherical pearlite and production method, which is applied in the field of metal heat treatment, can solve the problems that the decarburization layer is difficult to meet the actual use requirements, the increase of production cost investment, and the low annealing efficiency, etc., so as to enhance the movement speed and activity energy of electrons, and improve the heat treatment efficiency. Efficiency and short spheroidization time

Active Publication Date: 2014-04-16
ZHEJIANG MINGHE STEEL PIPE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-purity spheroidized structure, spheroidized grade 5-6, hardness below HRC18, the traditional isothermal spheroidized method is difficult to meet this requirement
[0003] The traditional spheroidizing annealing method is to control the temperature of the workpiece through isothermal curves in the heating furnace. This type of annealing efficiency is low, and it often takes 12 to 36 hours for each furnace product
At the same time, if no protective gas is added in industrial production, the surface oxidation of the product is very serious, and the decarburization layer is difficult to meet the actual use requirements.
If protective gas is added during mass production, the production cost input will be doubled, which is not conducive to industrial development

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: A kind of preparation method of high-purity spherical pearlite intermediate comprises two parts of material pretreatment and electromagnetic spheroidization heat treatment, and its specific operation steps are as follows:

[0024] (1) Material pretreatment:

[0025] A. Heat the workpiece with a carbon content of 0.8% to 1150°C and keep it warm for 60 minutes;

[0026] B. The heated workpiece is hot-extruded on the fungus punching machine, and the compression ratio is 5.2;

[0027] C. Air-mist cooling the compressed workpiece to below 100°C with a cooling rate of 50°C / min;

[0028] (2) Electromagnetic spheroidization heat treatment:

[0029] A. Connect both ends of the pretreated workpiece to an adjustable AC power supply of 750V;

[0030] B. Place the workpiece connected to the power supply in the induction magnetic field of the DC 24V electromagnetic coil, the ratio of the cross-sectional area of ​​the electromagnetic coil to the cross-sectional area o...

Embodiment 2

[0032] Embodiment 2: A kind of preparation method of high-purity spherical pearlite intermediate comprises two parts of material pretreatment and electromagnetic spheroidization heat treatment, and its specific operation steps are as follows:

[0033] (1) Material pretreatment:

[0034] A. Heat the workpiece with a carbon content of 0.8% to 1180°C and keep it warm for 50 minutes;

[0035] B. The heated workpiece is hot-extruded on the fungus punching machine, and the compression ratio is 6.0;

[0036] C. Air-mist cooling the compressed workpiece to below 100°C, the cooling rate is 60°C / min;

[0037] (2) Electromagnetic spheroidization heat treatment:

[0038] A. Connect both ends of the pretreated workpiece to an adjustable AC power supply of 850V;

[0039] B. The workpiece connected to the power supply is placed in the induction magnetic field of the DC 42V electromagnetic coil, the current I=3A, the ratio of the cross-sectional area of ​​the electromagnetic coil to the cr...

Embodiment 3

[0041] Embodiment 3: A kind of preparation method of high-purity spherical pearlite intermediate comprises two parts of material pretreatment and electromagnetic spheroidization heat treatment, and its specific operation steps are as follows:

[0042] (1) Material pretreatment:

[0043] A. Heat the workpiece with a carbon content of 1.0% to 1200°C and keep it warm for 60 minutes;

[0044] B. The heated workpiece is hot-extruded on the fungus-type punching machine, and the compression ratio is 6.5;

[0045] C. Air-mist cooling the compressed workpiece to below 100°C with a cooling rate of 55°C / min;

[0046] (2) Electromagnetic spheroidization heat treatment:

[0047] A. Connect both ends of the pretreated workpiece to an adjustable AC power supply of 1000V;

[0048] B. The workpiece connected to the power supply is placed in the induction magnetic field of the DC 50V electromagnetic coil, the current I=3A, the ratio of the cross-sectional area of ​​the electromagnetic coil t...

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Abstract

The invention relates to a manufacturing method of a high-purity spherical pearlite intermediate; the motion activity and direction of carbon atoms in metal are guided mainly by electric orientation and magnetic field orientation, which effectively changes the process of hypereutectoid steel during spheroidizing annealing; the electron motion speed and active energy are enhanced mainly by adding an end-part electric voltage device during the spheroidizing annealing process of hypereutectoid steel; the workpiece is also disposed in a direct current magnetic field to promote regular motion of charged particles, which effectively improve the heat treatment efficiency and spheroidizing formation speed; the invention has the characteristics of high spheroidizing formation speed, less time consumption, high heat treatment efficiency, low cost, high product spheroidizing grade, and the like.

Description

technical field [0001] The invention relates to the field of metal heat treatment, in particular to a method for preparing a high-purity spherical pearlite intermediate for the pre-quenching treatment of metal workpieces. Background technique [0002] Spheroidizing annealing is mainly used in hypereutectoid carbon steel and alloy tool steel (such as manufacturing tools, measuring tools, cold mold steel, etc.) in order to reduce the hardness, improve machinability, refine the uniform structure and improve the mechanical properties of the material, and provide future The proper quenching heat treatment preparation can greatly reduce the chance of quenching stress cracks. High-purity spheroidized structure, spheroidized grade 5-6, hardness below HRC18, the traditional isothermal spheroidized method is difficult to meet this requirement. [0003] The traditional spheroidizing annealing method is to control the temperature of the workpiece through isothermal curves in the heatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00
Inventor 高国梁郑元红陶志坚傅国柱
Owner ZHEJIANG MINGHE STEEL PIPE CO LTD
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