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Rod heat treatment spheroidizing annealing process

An annealing process and heat treatment furnace technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems affecting fastener wire quality and yield, fastener wire cracks, and fastener wire scrap, etc. The effect of low cost, low forming cracking rate and high production efficiency

Inactive Publication Date: 2018-11-13
浙江俊荣五金工业有限公司
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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

[0019] A disc element heat treatment spheroidizing annealing process, comprising the following steps

[0020] S1: Put the disk element wire in the heat treatment furnace, fill the heat treatment furnace with 99.999% nitrogen, and then raise the temperature in the furnace to 740°C and keep it for 5-7 hours. During this heating process, when the temperature in the furnace When the temperature rises to 650°C, turn off the industrial nitrogen, and fill the heat treatment furnace with methanol cracking gas;

[0021] S2: Feed ethane with a flow rate of 0.2-0.3m3 / h into the feeding furnace, and then cool the heating temperature to 350-400°C at a rate of 40°C / hour; Fill it with industrial nitrogen with a purity of 99.99%.

[0022] S3: Continue to cool the temperature in the furnace to 390-410°C at a rate of 80°C / hour;

[0023] S4: Continue to air cool the furnace temperature to 300-310°C at a rate of 20°C / hour;

[0024] S5: The disk element wire is naturally cooled to room temperat...

Embodiment 2

[0028] A disc element heat treatment spheroidizing annealing process, comprising the following steps

[0029] S1: Put the disk element wire in the heat treatment furnace, fill the heat treatment furnace with 99.999% nitrogen, then raise the temperature in the furnace to 750°C, and keep it for 6 hours. During this heating process, when the temperature in the furnace rises to At 650°C, turn off the industrial nitrogen gas, and fill the heat treatment furnace with methanol cracking gas;

[0030] S2: Feed ethane with a flow rate of 0.25m3 / h into the feeding furnace, and then cool the heating temperature to 375°C at a rate of 40°C / hour; at this time, close the methanol cracking gas, and then fill the heat treatment furnace with pure It is 99.99% industrial nitrogen.

[0031] S3: Continue to cool the temperature in the furnace to 400°C at a rate of 80°C / hour;

[0032] S4: Continue to air cool the furnace temperature to 305°C at a rate of 20°C / hour;

[0033] S5: The disk element w...

Embodiment 3

[0037] A disc element heat treatment spheroidizing annealing process, comprising the following steps

[0038] S1: Put the disk element wire in the heat treatment furnace, fill the heat treatment furnace with 99.999% nitrogen, then raise the temperature in the furnace to 760°C, and keep it for 7 hours. During this heating process, when the temperature in the furnace rises to At 650°C, turn off the industrial nitrogen gas, and fill the heat treatment furnace with methanol cracking gas;

[0039] S2: Feed ethane with a flow rate of 0.3m3 / h into the feeding furnace, and then cool the heating temperature to 400°C at a rate of 40°C / hour; at this time, close the methanol cracking gas, and then fill the heat treatment furnace with pure It is 99.99% industrial nitrogen.

[0040] S3: Continue to cool the temperature in the furnace to 410°C at a rate of 80°C / hour;

[0041] S4: Continue to air cool the furnace temperature to 310°C at a rate of 20°C / hour;

[0042] S5: The disk element wi...

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PUM

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Abstract

The invention discloses a rod heat treatment spheroidizing annealing process. The process is characterized by comprising the following steps: (S1) a rod wire is positioned in a heat treatment furnace;protective gas is filled in the heat treatment furnace; and the temperature in the furnace is increased to 740-760 DEG C, and is maintained by 5-7 h; (S2) ethane with a flow of 0.2-0.3 m<3> / h is introduced in the furnace; and then, the heating temperature is lowered to 350-400 DEG C at the speed of 40 DEG C / h; (S3) the temperature in the furnace is continuously lowered to 390-410 DEG C at the speed of 80 DEG C / h; (S4) the temperature in the furnace is continuously lowered to 300-310 DEG C at the speed of 20 DEG C / h by air cooling; and (S5) the rod wire is naturally cooled to the normal temperature along with the furnace. The process of heating, insulation, first-phase cooling, second-phase cooling, third-phase cooling and fourth-phase natural cooling is adopted to achieve the advantages of the better spheroidizing annealing effect, high ductility and low hardness of fastener wires, adaption to subsequent plastic molding and the low cracking rate in product molding; and meanwhile, theprocess is simple in flow, low in equipment requirement, high in production efficiency and lower in cost.

Description

technical field [0001] The invention belongs to the technical field of disk element heat treatment, and in particular relates to a disk element heat treatment spheroidizing annealing process. Background technique [0002] In the production of fastener wires, after slow cooling or annealing according to the existing process, the hardness of the fastener wires is high and cracks appear. If the light ones need to be cut off, the cracks will be used, and the severe ones will directly lead to the production of fastener wires. Scrapping seriously affects the quality and yield of fastener wires. [0003] 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 for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/32C21D9/52C21D1/74
CPCC21D1/32C21D1/74C21D9/525
Inventor 刘孟斐吴雅铃陈冠成周仁杰李小彬王卫东
Owner 浙江俊荣五金工业有限公司