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Method for obtaining same structure as lead bath quenching process

A technology of lead bath quenching and process, applied in the direction of quenching agent, manufacturing tools, furnace types, etc., can solve the problems of lead pollution environment, human body toxicity, harm to human health, etc., and achieve good section shrinkage rate and hardness performance, tensile strength good strength effect

Inactive Publication Date: 2021-01-08
LIANFENG STEEL (ZHANGJIAGANG) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are many defects in lead bath quenching, the main performance is that lead pollutes the environment and endangers human health; threading is very inconvenient and labor-intensive; Subsequent processing
Moreover, the lead bath will volatilize toxic gas, which is highly toxic to the human body, so it is urgent to develop a green and pollution-free process to replace the lead bath quenching process

Method used

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  • Method for obtaining same structure as lead bath quenching process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Quenching the rolled product at 870°C for 30 minutes at a heating rate of 15°C / s; then cooling to 450°C for tempering for 1 hour at a cooling rate of 5°C / s;

[0020] (2) immerse the hot water obtained in step (1) at a temperature of 90-100° C. for quenching, and keep it warm for 2-3 hours;

[0021] (3) Tempering the product obtained in step (2) at 200° C. for 2 hours, and keeping it warm for 1 hour; the obtained metallographic structure is a sorbite structure.

Embodiment 2

[0023] (1) Quenching the rolled product at 880°C for 20 minutes at a heating rate of 15°C / s; then cooling to 460°C for tempering for 0.6h at a cooling rate of 5°C / s;

[0024] (2) immerse the hot water obtained in step (1) at a temperature of 90-100° C. for quenching, and keep it warm for 2-3 hours;

[0025] (3) Tempering the product obtained in step (2) at 200° C. for 2 hours, and keeping it warm for 0.6 hours; the obtained metallographic structure is a sorbite structure.

Embodiment 3

[0027] (1) Quenching the rolled product at 890°C for 15 minutes at a heating rate of 15°C / s; then cooling to 480°C for 0.8h at a cooling rate of 5°C / s;

[0028] (2) immerse the hot water obtained in step (1) at a temperature of 90-100° C. for quenching, and keep it warm for 2-3 hours;

[0029] (3) Tempering the product obtained in step (2) at 210° C. for 1 h, and keeping it warm for 0.8 h; the obtained metallographic structure is a sorbite structure.

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Abstract

The invention belongs to the field of metallurgy, and particularly relates to a method for obtaining the same structure as a lead bath quenching process. The method is characterized by comprising thestep of adjusting quenching after rolling, specifically, firstly carrying out quenching treatment and tempering treatment; then, carrying out quenching treatment; and finally, carrying out tempering treatment and heat preservation treatment. According to the obtained sorbite structure, the steel strength is effectively improved, the quenching process is environment-friendly, and the production cost is reduced. The obtained product is good in tensile strength, section shrinkage rate and hardness performance.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a method for obtaining the same structure as the lead bath quenching process. Background technique [0002] The output and structural varieties of steel cords in my country are increasing year by year. Steel cord manufacturers have also been committed to the optimization of production processes. Through equipment improvement and process adjustment, the broken wire rate of each production process is continuously reduced, and production efficiency and comprehensive yield are improved. . The change of quenching method in production practice has brought a great improvement to the stability and efficiency of steel cord production. [0003] Quenching is a key process in the production of medium and high carbon steel wire, especially the final heat treatment quenching process. The steel wire is quenched to obtain a sorbite structure. Such a structure has a high tensile limit, and the steel wir...

Claims

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Application Information

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IPC IPC(8): C21D8/06C21D1/18C21D1/60C21D9/52
CPCC21D8/065C21D1/18C21D1/60C21D9/525C21D2211/00
Inventor 侯兴辉王晓兰陆旭霞季灿南唐庆慧邹佳磊许竹桃
Owner LIANFENG STEEL (ZHANGJIAGANG) CO LTD
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