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Spheroidizing annealing process of screw wire rod

A spheroidizing annealing and wire technology, which is applied to manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of screw wire cracks, screw wire scrap, affecting the quality and yield of screw wires, and achieves low forming cracking rate and low cost. , good effect of spheroidizing annealing

Active Publication Date: 2013-01-16
DONGGUAN KELEE STEEL WIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in production, when smelting low-carbon alloy steel screw wire rods, the hardness of the screw wire rods is relatively high after slow cooling or annealing according to the existing process, and a large number of screw wire rods have cracks. Otherwise, it directly leads to the scrapping of the produced screw wire, which seriously affects the quality and yield of the screw wire.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of spheroidizing annealing process of screw wire, it comprises the following steps successively:

[0027] A. Put the screw wire made of low-carbon alloy steel 10B21 in the heat treatment furnace, put the screw wire in the heat treatment furnace, fill the heat treatment furnace with industrial nitrogen with a purity of 99.9%, and set the temperature in the furnace to 100°C Raise the temperature to 710°C at a speed of 1 hour, and keep it warm for 5 hours;

[0028] B. The first stage of cooling: the temperature in the furnace is cooled to 540°C at a rate of 20°C / hour by air cooling;

[0029] C. The second stage of cooling: continue to cool the temperature in the furnace to 390°C at a rate of 80°C / hour by air cooling

[0030] D. The third stage of cooling: the screw wire is out of the furnace and cooled to room temperature naturally.

[0031] The screw wire treated in this embodiment was subjected to a Rockwell hardness test, and its hardness was 117 after testing....

Embodiment 2

[0035] A kind of spheroidizing annealing process of screw wire, it comprises the following steps successively:

[0036] A. Put the screw wire made of low-carbon alloy steel 10B21 in the heat treatment furnace, put the screw wire in the heat treatment furnace, fill the heat treatment furnace with industrial nitrogen with a purity of 99.9%, and then set the temperature in the furnace to 130°C Raise the temperature to 720°C at a speed of 1 hour, and keep it warm for 6 hours;

[0037] B. Cooling in the first stage: Cool the temperature in the furnace to 550°C at a rate of 20°C / hour through air cooling;

[0038] C. The second stage of cooling: continue to cool the temperature in the furnace to 400°C at a rate of 80°C / hour by air cooling

[0039] D. The third stage of cooling: the screw wire is out of the furnace and cooled to room temperature naturally.

[0040] The screw wire treated in this embodiment was subjected to a Rockwell hardness test, and its hardness was 116 after tes...

Embodiment 3

[0044] A kind of spheroidizing annealing process of screw wire, it comprises the following steps successively:

[0045] A. Put the screw wire made of low-carbon alloy steel 10B21 in a heat treatment furnace, put the screw wire in the heat treatment furnace, fill the heat treatment furnace with industrial nitrogen with a purity of 99.9%, and set the temperature in the furnace at 145°C / The temperature was raised to 730°C at the speed of one hour, and the temperature was kept for 8 hours;

[0046] B. The first stage of cooling: the temperature in the furnace is cooled to 560°C at a rate of 20°C / hour by air cooling;

[0047] C. The second stage of cooling: continue to cool the temperature in the furnace to 410°C at a rate of 80°C / hour by air cooling

[0048] D. The third stage of cooling: the screw wire is out of the furnace and cooled to room temperature naturally.

[0049] The screw wire treated in this embodiment was subjected to a Rockwell hardness test, and its hardness wa...

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Abstract

The invention relates to an annealing process of a metal material, in particular to a spheroidizing annealing process of a screw wire rod. The spheroidizing annealing process comprises the following steps: placing the screw wire rod into a heat treatment furnace, filing insert gas into the heat treatment furnace, heating the temperature in the furnace to 710-730 DEG C, and thermally insulating for 5-8 hours; cooling at the first stage, that is to say, cooling the temperature in the furnace to 540-560 DEG C at the speed of 20 DEG C per hour; cooling at the first stage, that is to say, cooling the temperature in the furnace to 390-410 DEG C at the speed of 80 DEG C per hour; and cooling in the third stage, that is to say, discharging the screw wire rod and naturally cooling to normal temperature. The screw wire rod treated by the process method provided in the invention has the advantages of high ductility and low hardness, and is suitable for sequential plastic processing molding, and a product has low molding cracking rate.

Description

technical field [0001] The invention relates to an annealing process for metal materials, in particular to a spheroidizing annealing process for screw wires. Background technique [0002] Spheroidizing annealing is one of the basic ways to improve the structure and properties of steel. The main purpose of spheroidizing annealing is to spheroidize carbides in the microstructure of steel materials, reduce the hardness of materials, improve the plasticity of materials, and reduce the deformation resistance of materials. , making the material easy to be plastically formed. To obtain ideal performance and structure in screw wire production, the key is to choose the appropriate spheroidizing annealing process. [0003] The Chinese invention patent with the publication number CN1245524C introduces a low-carbon low-alloy steel spheroidizing annealing process. The workpiece is placed in the annealing furnace, and the heating temperature and time are controlled to carry out the annea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/32C21D9/52
Inventor 王斯华
Owner DONGGUAN KELEE STEEL WIRE
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