Spheroidizing annealing process of superplasticity fastener wire rod

A fastener wire, spheroidizing annealing technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve problems affecting the quality and yield of fastener wire, cracks in fastener wire, scrapping of fastener wire, etc. , to achieve the effect of low forming crack rate, high ductility and low hardness

Inactive Publication Date: 2013-03-27
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 the production of fastener wires, after the fastener wires are slowly cooled or annealed according to the existing process, the hardness is relatively high, and cracks appear in a large number of fastener wires. If the cracks are light, the cracks need to be cut and used, and if the severe ones are directly Lead to the scrapping of the fastener wire produced, which seriously affects the quality and yield of the fastener wire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A spheroidizing annealing process for a superplastic fastener wire, which comprises the following steps in sequence:

[0028] A. Put the fastener wire made of SCM435 in a heat treatment furnace, fill the heat treatment furnace with industrial nitrogen with a purity of 99.99%, and raise the temperature in the furnace to 650°C at a rate of 95°C / hour, then turn it off Process nitrogen, fill the heat treatment furnace with methanol cracking gas, continue to heat up to 740 ° C, and keep it for 7 hours;

[0029] B. The first stage of cooling: Cool the temperature in the furnace to 680°C at a rate of 30°C / hour by air cooling, keep it warm for 4 hours, turn off the methanol cracking gas, and fill the heat treatment furnace with industrial nitrogen with a purity of 99.99% ;

[0030] C. The second stage of cooling: continue to cool the temperature in the furnace to 390°C at a rate of 50°C / hour by air cooling

[0031] D. The third stage of cooling: the fastener wire is naturally...

Embodiment 2

[0036] A spheroidizing annealing process for a superplastic fastener wire, which comprises the following steps in sequence:

[0037] A. Put the fastener wire made of SCM435 in the heat treatment furnace, fill the heat treatment furnace with industrial nitrogen with a purity of 99.99%, and then raise the temperature in the furnace to 650°C at a rate of 115°C / hour, then turn off Process nitrogen, fill the heat treatment furnace with methanol cracking gas, continue to heat up to 750°C, and keep warm for 6h;

[0038] B. The first stage of cooling: Cool the temperature in the furnace to 670°C at a rate of 30°C / hour by air cooling, keep it warm for 5 hours, turn off the methanol cracking gas, and fill the heat treatment furnace with industrial nitrogen with a purity of 99.99% ;

[0039] C. Second-stage cooling: continue to cool the temperature in the furnace to 400°C at a rate of 50°C / hour by air cooling

[0040] D. The third stage of cooling: the fastener wire is naturally cooled...

Embodiment 3

[0045] A spheroidizing annealing process for a superplastic fastener wire, which comprises the following steps in sequence:

[0046] A. Put the fastener wire made of SCM435 in a heat treatment furnace, fill the heat treatment furnace with industrial nitrogen with a purity of 99.99%, and raise the temperature in the furnace to 650°C at a rate of 130°C / hour, then close the process Nitrogen, fill the heat treatment furnace with methanol cracking gas, continue to heat up to 760°C, and keep warm for 5h;

[0047] B. The first stage of cooling: Cool the temperature in the furnace to 660°C at a rate of 30°C / hour by air cooling, keep it warm for 6 hours, turn off the methanol cracking gas, and fill the heat treatment furnace with industrial nitrogen with a purity of 99.99% ;

[0048] C. The second stage of cooling: continue to cool the temperature in the furnace to 410°C at a rate of 50°C / hour by air cooling

[0049] D. The third stage of cooling: the fastener wire is naturally coole...

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Abstract

The invention relates to an annealing process of metal materials, in particular to a spheroidizing annealing process of a superplasticity fastener wire rod. The process includes the following steps that the fastener wire rod is placed in a thermal treatment furnace, protective gases are fed into the thermal treatment furnace, the interior temperature of the furnace is increased to 740 DEG C to 760 DEG C, and the temperature is maintained for 5 to 7 hours; according to first-stage cooling, the interior temperature of the furnace is decreased to 660 DEG C to 680 DEG C at the speed of 30 DEG C per hour, and the temperature is maintained for 4 to 6 hours; according to second-stage cooling, the interior temperature of the furnace is continued to be decreased to 390 DEG C to 410 DEG C at the speed of 50 DEG C per hour; and according to third-stage cooling, the fastener wire rod is naturally cooled to a room temperature. The fastener wire rod processed by the process has the advantages that the malleability is high, the hardness is low, the process is suitable for subsequent plastic working forming, and the product forming cracking rate is low.

Description

technical field [0001] The invention relates to an annealing process for metal materials, in particular to a spheroidizing annealing process for superplastic fastener 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. Fasteners are the general term for a class of mechanical parts used when two or more parts (or components) are fastened and connected into a whole. In order to obtain ideal performance and organization in the production of fastener wires, the key is Select the appropriate spheroidizing annealing process. [0003] The Chinese invention patent with the publication number CN1245524C introduces a...

Claims

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Application Information

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