A non-phase-change rapid softening treatment process for cold-work steel wire rods for fasteners

A technology for softening and cold working steel, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., to achieve the effect of shortening spheroidizing annealing time, improving production efficiency, and shortening spheroidizing time

Active Publication Date: 2015-10-28
嘉兴金凌五金科技股份有限公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, use the principle of small deformation cold drawing to increase dislocation defects to promote the diffusion of carbon atoms, and provide a rapid softening process for wire rods without phase change that can meet the requirements of cold heading deformation method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Content Example Material Material diameter (mm) Cold drawing deformation (%) Diameter after cold drawing (mm) Heating temperature (°C) Heating and holding time (min) cooling method Spherification Grade Hardness (HB) Example 1 Medium Carbon Alloy Steel 12 10 10.80 650 30 With the furnace down to 500 ℃ and then air-cooled 4 150 Example 2 Medium Carbon Alloy Steel 12 10 10.80 680 45 With the furnace down to 500 ℃ and then air-cooled 3 145 Example 3 Medium Carbon Alloy Steel 12 10 10.80 700 50 air cooling 3 140 Example 4 Medium Carbon Alloy Steel 12 9.3 10.88 690 20 air cooling 4 150 Example 5 Medium Carbon Alloy Steel 12 9.3 10.88 680 30 air cooling 4 145 Example 6 Medium Carbon Alloy Steel 12 9.3 10.88 670 40 With the furnace down to 500 ℃ and then air-cooled 4 155 Example 7 Medium Carbon Alloy Steel 12 9.3 10.88 680 45 air cooling 3 145 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
hardnessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a non-phase-change rapid softening treatment technology of a cold work steel wire rod for a fastener. Non-phase-change rapid softening treatment on the steel wire rod of which the deformation is 5-10% after cold drawing deformation treatment comprises a spheroidizing procedure and a cooling treatment procedure, wherein the heating temperature is 650-700 DEG C and the heating and heat preservation time is 20-60 minutes in the spheroidizing procedure. By adopting the technology disclosed by the invention, a globular pearlite tissue with small deformation resistance is supplied for subsequent cold heading deformation. Compared with the traditional spheroidizing annealing before cold heading in manufacturing of the fastener, the technology disclosed by the invention has the effects that the spheroidizing annealing time is obviously shortened, the production efficiency is improved, and energy conservation and emission reduction are achieved.

Description

technical field [0001] The invention relates to a process method for rapid softening treatment at a temperature lower than the eutectoid phase transformation after the wire rod for medium-carbon or medium-carbon alloy steel fasteners with pearlite + ferrite structure is deformed by cold drawing , especially relates to the non-phase-transformation rapid softening treatment process for medium-carbon or medium-carbon alloy steel fastener wires with a deformation of 5% to 10%. Background technique [0002] Most of the fasteners are made of hot-rolled medium-carbon or medium-carbon alloy steel. For products that require cold heading for the head of the fastener, it is necessary to prevent cracking caused by high hardness and poor plasticity of the material during cold heading, and to reduce the risk of cold heading. The wear of the mold, therefore, requires the organization before forming to be a spheroidized body. Utilizing the principle that the increase of dislocation density...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06C21D1/32C21D9/52
Inventor 毛向阳蔡璐王章忠赵秀明
Owner 嘉兴金凌五金科技股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap