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Steel band quenching technique and cooling medium used for the same

A technology of cooling medium and steel belt, which is applied in the direction of quenching agent, manufacturing tools, furnaces, etc., can solve environmental pollution and other problems, achieve good plastic deformation ability, ensure hardness, and increase viscosity

Active Publication Date: 2008-09-17
ZHEJIANG BAINAI STEEL STRIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liquid metal has excellent thermal conductivity and can quickly cool the steel strip to the same temperature as itself, so it can exceed the critical cooling speed V C , so as to avoid unfavorable tissue transformation, but lead Pb will cause serious pollution to the environment

Method used

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  • Steel band quenching technique and cooling medium used for the same
  • Steel band quenching technique and cooling medium used for the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The quenching process step of the present embodiment is:

[0017] (1) The spring steel strip is first heated to transform it into an austenitic structure;

[0018] (2) The heated spring steel strip is greater than the critical cooling rate V C The cooling rate is cooled to above the martensitic transformation temperature Ms (such as figure 2 Point C in), the cooling medium is 100% liquid tin by weight;

[0019] (3) the spring steel strip after cooling still maintains the austenitic state, and the spring steel strip is bent;

[0020] (4) The bent spring steel strip is rapidly cooled by air cooling to transform it into a martensitic structure.

[0021] The cooling medium in this embodiment is 100% liquid tin by weight.

Embodiment 2

[0023] The quenching process step of the present embodiment is:

[0024] (1) The spring steel strip is first heated to transform it into an austenitic structure;

[0025] (2) The heated spring steel strip is greater than the critical cooling rate V C The cooling rate is cooled to above the martensitic transformation temperature Ms (such as figure 2 Point C in), the cooling medium is 85% liquid tin by weight, 12% liquid zinc by weight, and 3% liquid bismuth by weight;

[0026] (3) the spring steel strip after cooling still maintains the austenitic state, and the spring steel strip is bent;

[0027] (4) The bent spring steel strip is rapidly cooled by air cooling to transform it into a martensitic structure.

[0028] The cooling medium in this embodiment adopts 85% by weight liquid tin, 12% by weight liquid zinc, and 3% by weight liquid bismuth.

Embodiment 3

[0030] The quenching process step of the present embodiment is:

[0031] (1) The spring steel strip is first heated to transform it into an austenitic structure;

[0032] (2) The heated spring steel strip is greater than the critical cooling rate V C The cooling rate is cooled to above the martensitic transformation temperature Ms (such as figure 2 Point C in), the cooling medium is 90% liquid tin by weight, and 10% liquid zinc by weight;

[0033] (3) the spring steel strip after cooling still maintains the austenitic state, and the spring steel strip is bent;

[0034] (4) The bent spring steel strip is rapidly cooled by air cooling to transform it into a martensitic structure.

[0035] The cooling medium in this embodiment adopts 90% by weight liquid tin and 10% by weight liquid zinc.

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PUM

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Abstract

The invention discloses a quenching method and a cooling medium, particularly a spring steel band quenching method and a cooling medium thereof. The quenching method comprises the steps of: heating a spring steel band to obtain a spring steel band with convert thereof austenite structure; cooling to above martensitic transformation temperature Ms with molten tin 81.5-100 wt%, molten zinc 0-15 wt% and molten bismuth 0-3.5 wt% as cooling medium; bending the cooled spring steel band still keeping in austenitic state; and rapid cooling to obtain the spring steel band with austenite structure. The inventive method can realize necessary bending for continuous production of spring steel band, and ensure the steel band hardness; and the used cooling medium has the advantages of no pollution, no corrosion and good heat-conducting performance.

Description

technical field [0001] The invention relates to a quenching process and a cooling medium, in particular to a spring steel strip quenching process and the used cooling medium. Background technique [0002] Spring steel strips have high elasticity and wear resistance, and are widely used in automobile clutches, masonry tools, rolling door springs, iron sheets for shoes, needles for textiles, etc., and are generally medium and high carbon steels such as 50#, 65Mn, and T8A. Or alloy steel material, it needs to go through the heat treatment process of quenching and tempering to get the combination of hardness and toughness, so that it has high elasticity and high wear resistance. [0003] The heat treatment process of quenching and tempering usually adopts such as figure 1 The shown continuous quenching and tempering equipment for steel strips is composed of three parts: quenching heating furnace 1, quenching cooler 2, and tempering heating furnace 3. The steel strip A is in th...

Claims

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Application Information

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IPC IPC(8): C21D9/52C21D1/56
Inventor 李益明
Owner ZHEJIANG BAINAI STEEL STRIP