Spheroidizing annealing process for high-toughness medium carbon steel wires

A technology of spheroidizing annealing and high toughness, which is applied in the direction of manufacturing tools, furnace types, furnaces, etc. It can solve the problems of long holding time, easy to wear out molds, and high energy consumption, and achieve low molding cracking rate, low equipment requirements, The effect of simple process

Inactive Publication Date: 2014-08-20
DONGGUAN KELEE STEEL WIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has a long heat preservation time and high energy consumption. At the same time, its heating and cooling rates are not controlled, and ultimately the stability of product performance is poor. If it is not properly controlled, it will easily lead to uneven metallographic structure and hardness High, poor toughness, a large number of superplastic medium carbon steel wires are difficult to form due to poor toughness during cold forming, and are easy to wear out the mold. At the same time, the superplastic medium carbon steel wires produced are scrapped, which seriously affects the quality and yield of superplastic medium carbon steel wires

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A spheroidizing annealing process for high-toughness medium-carbon steel wire, which comprises the following steps in sequence:

[0028] A. Put the 45# medium carbon steel wire in the 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 500°C at a rate of 90°C / hour, then close the process Nitrogen, fill the heat treatment furnace with methanol cracking gas, continue to heat up to 710°C, and keep it warm for 5h;

[0029] B. Cooling in the first stage: Cool the temperature in the furnace to 700°C at a rate of 10°C / hour through air cooling, and keep it warm for 2 hours;

[0030] C. Second-stage cooling: continue to cool the temperature in the furnace to 630°C at a rate of 10°C / hour by air cooling, close the methanol cracking gas, and fill the heat treatment furnace with industrial nitrogen with a purity of 99.99%;

[0031] D. The third stage of cooling: the medium carbon steel...

Embodiment 2

[0036] A spheroidizing annealing process for high-toughness medium-carbon steel wire, which comprises the following steps in sequence:

[0037] A. Put the 45# medium carbon steel wire 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 500°C at a rate of 110°C / hour, and then close the process Nitrogen, fill the heat treatment furnace with methanol cracking gas, continue to heat up to 720°C, and keep warm for 4h;

[0038] B. The first stage of cooling: Cool the temperature in the furnace to 690°C at a rate of 10°C / hour through air cooling, and keep it warm for 3 hours;

[0039] C. Second-stage cooling: continue to cool the temperature in the furnace to 640°C at a rate of 10°C / hour through air cooling, close the methanol cracking gas, and fill the heat treatment furnace with industrial nitrogen with a purity of 99.99%;

[0040] D. The third stage of cooling: the medium ...

Embodiment 3

[0045] A spheroidizing annealing process for high-toughness medium-carbon steel wire, which comprises the following steps in sequence:

[0046] A. Put the 45# medium carbon steel wire in the heat treatment furnace, fill the heat treatment furnace with industrial nitrogen with a purity of 99.99%, raise the temperature in the furnace to 500°C at a rate of 120°C / hour, and turn off the process nitrogen , fill the heat treatment furnace with methanol cracking gas, continue to heat up to 730°C, and keep it warm for 3h;

[0047] B. The first stage of cooling: Cool the temperature in the furnace to 680°C at a rate of 10°C / hour through air cooling, and keep it warm for 4 hours;

[0048] C. Second-stage cooling: continue to cool the temperature in the furnace to 650°C at a rate of 10°C / hour by air cooling, close the methanol cracking gas, and fill the heat treatment furnace with industrial nitrogen with a purity of 99.99%;

[0049] D. The third stage of cooling: the medium carbon steel...

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Abstract

The invention discloses a spheroidizing annealing process for high-toughness medium carbon steel wires. The spheroidizing annealing process comprises the steps as follows: putting the steel wires into a heat treatment furnace, charging protective gases into the heat treatment furnace, raising the temperature in the furnace to 710-730 DEG C, and keeping the temperature for 3-5 hours; performing first-stage cooling: cooling the temperature in the furnace to 680-700 DEG C at a speed of 10 DEG C / hour, and keeping the temperature for 2-4 hours; performing second-stage cooling: continuously cooling the temperature in the furnace to 630-650 DEG C at the speed of 10 DEG C / hour; and performing third-stage cooling: naturally cooling the medium carbon steel wires to a normal temperature. The medium carbon steel wires, which are processed by the process provided by the invention, are uniform in metallographic structure, high in toughness, high in malleability, and low in hardness; and the medium carbon steel wires are suitable for subsequent difficult multi-step stamping and forming, and are low in flattening, bending, and cracking rate.

Description

Technical field: [0001] The invention relates to an annealing process for metal materials, in particular to a spheroidizing annealing process for high-toughness medium-carbon steel wire. 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. , so that the material is easy to be plastically processed and formed. To obtain ideal properties and structures in the production of medium carbon steel wire, the key is to choose an appropriate spheroidizing annealing process. [0003] At present, medium carbon steel has been widely used in the production of cold heading parts and extrusion parts, especially with the development of science and technology, the performance requirem...

Claims

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Application Information

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IPC IPC(8): C21D1/32C21D6/00C21D9/52
Inventor 福安王斯华
Owner DONGGUAN KELEE STEEL WIRE
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