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A rapid spheroidization process for cold-drawn deformed steel wire

A technology of spheroidizing and steel wire, which is applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of unable to meet the requirements of rapid production of steel wire, difficult deformation of steel wire in cold drawing, easy wear of molds, etc., and achieve low work hardening rate, The effect of small deformation resistance and easy cold drawing deformation

Inactive Publication Date: 2017-09-26
NANJING INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fine-layer lamellar pearlite structure obtained by the above-mentioned austempering treatment process has a high work hardening rate, and the deformation resistance is relatively large in the subsequent cold drawing deformation process, making it difficult for the steel wire to be cold drawn and deformed, and the mold is easy to wear
However, the traditional process of eliminating cold drawing work hardening, such as spheroidizing annealing and recrystallization annealing, takes tens of minutes to several hours, which cannot meet the requirements of rapid production of steel wire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The rapid spheroidization treatment process for cold-drawn deformed steel wire provided in this embodiment includes a cold-drawing process, a high-temperature rapid heating process, and a rapid cooling process after being released from the furnace. In the cold-drawing process, at least one cold drawing is used to control the cold-drawing deformation to 30%. -95%;

[0017] In the high-temperature rapid heating process, according to the diameter and deformation of the steel wire after cold drawing and deformation, the heating temperature is 900 ° C ~ 1070 ° C, and the heating time is controlled at 3s ~ 45s; Cool to room temperature;

[0018] The steel wire adopts a high carbon steel wire rod with a diameter of 5mm-6.5mm and a carbon content of 0.7%-0.95% by weight.

[0019] The cooling method adopts air cooling, blowing cooling, spray cooling or water cooling.

Embodiment 2

[0021] The aforementioned rapid spheroidization treatment process for cold-drawn deformed steel wire adopts a high-carbon steel wire rod with a diameter of 5mm-6.5mm and a carbon content of 0.7%-0.95% by weight, including a cold-drawing process, a high-temperature rapid heating process, and a rapid cooling process out of the furnace , In the cold drawing process, the cold drawing deformation (area reduction rate) is controlled to be 30% to 52%, and the steel wire with a diameter of 4.5mm to 3.8mm after cold drawing deformation; in the high temperature rapid heating process, a continuous heating furnace is used for heating (such as electric furnace heating, natural gas heating, etc.), by designing the length of the heating furnace and controlling the speed of the steel wire passing through the heating furnace to control the heating time of the steel wire, the heating temperature is 900 ° C ~ 1050 ° C, and the heating time is 25s ~ 45s; the furnace is fast In the cooling process,...

Embodiment 3

[0023] The aforementioned rapid spheroidization treatment process for cold-drawn deformed steel wire adopts a high-carbon steel wire rod with a diameter of 5mm-6.5mm and a carbon content of 0.7%-0.95% by weight, including a cold-drawing process, a high-temperature rapid heating process, and a rapid cooling process out of the furnace , In the cold drawing process, the cold drawing deformation (area reduction rate) is controlled to be 52% to 66%, and the steel wire with a diameter of 3.8mm to 3.2mm after cold drawing deformation; in the high temperature rapid heating process, a continuous heating furnace is used for heating (such as electric furnace heating, natural gas heating, etc.), the heating time of the steel wire is controlled by designing the length of the heating furnace and controlling the speed of the steel wire passing through the heating furnace. The heating temperature is 900 ° C ~ 1050 ° C, and the heating time is 20s ~ 35s; the furnace is fast In the cooling proce...

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Abstract

The invention relates to a rapid spheroidization treatment process for cold-drawn deformed steel wire, which includes a cold-drawing process, a high-temperature heating process, and a rapid cooling process at the outlet. 95%; in the high-temperature rapid heating process, according to the diameter and deformation of the steel wire after cold drawing and deformation, the heating temperature is 900 ° C ~ 1070 ° C, and the heating time is controlled at 3s ~ 45s; Cool to room temperature within 5 minutes; the invention has the effects of saving energy, improving efficiency, and being beneficial to environmental protection, and has a low work hardening rate and low hardness, which is more conducive to the subsequent cold drawing deformation of steel wires and the improvement of the service life of molds.

Description

technical field [0001] The invention relates to a rapid spheroidization process for cold-drawn deformed steel wire, which belongs to the field of cold-drawn steel wire processing. Background technique [0002] In the production process of steel wire for radial tire steel cord, piano steel wire, etc., high-carbon steel (with a carbon content of 0.7% to 0.95%) with a diameter of 5.5mm is mostly used. Yes, in order to ensure the cold-drawing performance for continuous cold-drawing deformation, after a certain amount of cold-drawing deformation, the austenitizing and then austenitizing austempering treatment process is usually adopted, that is, the steel wire after cold-drawing deformation is heated rapidly to the material The austenitic structure is obtained above the austenitizing temperature, and then rapidly cooled and kept warm in a lead bath or sand bath at a certain temperature, thereby obtaining a fine-layer flaky pearlite structure, eliminating the processing of the int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06C21D1/32C21D9/52
Inventor 赵秀明毛向阳蔡璐王章忠陈钢良张忠明
Owner NANJING INST OF TECH