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102-grade steel cord, 102-grade cord steel wire rod and production method of 102-grade cord steel wire rod

A production method and cord steel technology, which is applied in the field of iron and steel smelting, can solve the problems of high difficulty in steel cord manufacturing, high rate of broken wires in drawing, and high rate of broken wires in twisted strands, so as to reduce the size of inclusions and increase the carbon content , The effect of uniform structure of the wire rod

Pending Publication Date: 2022-04-12
ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the development of higher-strength steel cords is the current mainstream demand. At present, the strength of steel cords is mainly improved by increasing the carbon content in the industry. However, with the continuous increase of carbon content, the manufacturing difficulty of steel cords is also becoming more and more difficult. It is mainly manifested in the problems of high wire breaking rate in drawing, high wire breaking rate in twisting strands, high die consumption, and low finished product rate.

Method used

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  • 102-grade steel cord, 102-grade cord steel wire rod and production method of 102-grade cord steel wire rod
  • 102-grade steel cord, 102-grade cord steel wire rod and production method of 102-grade cord steel wire rod

Examples

Experimental program
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Effect test

Embodiment 1

[0059] (1) The stage of steel smelting, including the following processes carried out in sequence:

[0060] (1) Hot metal pre-desulfurization

[0061]The blast furnace slag in the molten iron ladle is removed before desulfurization, and the slag removal rate is 81%. The blast furnace molten iron is used for desulfurization in the KR desulfurization device. ≤0.04%, Ti≤0.04%, Si 0.20~0.60%, P≤0.10%, the rest is Fe and other unavoidable impurities, and the S content in the hot metal after pre-desulfurization is 0.0013%.

[0062] (2) Converter smelting

[0063] The pretreated molten iron is sent to the converter and mixed with scrap steel to form molten steel, and desiliconization, dephosphorization, oxygen blowing and decarburization are carried out; among them, the proportion of molten iron in the molten steel is 86%, and the scrap steel is made of high-quality scrap steel. The above-mentioned high-quality steel scrap meets: thickness ≥ 2cm, S ≤ 0.02%, P ≤ 0.02%. % when addin...

Embodiment 2

[0082] (1) The stage of steel smelting, including the following processes carried out in sequence:

[0083] (1) Hot metal pre-desulfurization

[0084] The blast furnace slag in the ladle is removed before desulfurization, and the slag removal rate is 84%. The blast furnace hot metal is used for desulfurization in the KR desulfurization device. ≤0.04%, Ti≤0.04%, Si 0.20~0.60%, P≤0.10%, the rest is Fe and other unavoidable impurities, and the S content in the hot metal after pre-desulfurization is 0.0015%.

[0085] (2) Converter smelting

[0086] The pretreated molten iron is sent to the converter and mixed with scrap steel to form molten steel, and desiliconization, dephosphorization, oxygen blowing and decarburization are carried out; among them, the proportion of molten iron in the molten steel is 86%, and the scrap steel is made of high-quality scrap steel. The above-mentioned high-quality steel scrap meets: thickness ≥ 2cm, S ≤ 0.02%, P ≤ 0.02%. % when adding the rest of...

Embodiment 3

[0105] (1) The stage of steel smelting, including the following processes carried out in sequence:

[0106] (1) Hot metal pre-desulfurization

[0107] The blast furnace slag in the molten iron ladle is removed before desulfurization, and the slag removal rate is 89%. The blast furnace molten iron is used for desulfurization in the KR desulfurization device, and the blast furnace molten iron satisfies the following requirements before desulfurization: temperature 1360°C, C 4.0-4.5%, S ≤0.04%, Ti≤0.04%, Si 0.20~0.60%, P≤0.10%, the rest is Fe and other unavoidable impurities, and the S content in the hot metal after pre-desulfurization is 0.002%.

[0108] (2) Converter smelting

[0109] The pretreated molten iron is sent to the converter and mixed with scrap steel to form molten steel, and desiliconization, dephosphorization, and oxygen blowing decarburization are carried out; among them, the proportion of molten iron in the molten steel is 84%, and the scrap steel is made of hi...

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Abstract

The invention discloses a 102-grade steel cord, a 102-grade steel cord steel wire rod and a production method of the 102-grade steel cord steel wire rod. The production method comprises the following steps: in a steel smelting stage, smelting molten steel of which the size of inclusions is less than or equal to 15 microns; in the blank casting stage, the center carbon segregation value of a continuous casting blank is smaller than or equal to 1.05, and C in a segregation area is smaller than or equal to 1.09%; a cogging stage; in the rolling stage, the rolled wire rod comprises the following chemical components in percentage by mass: 1.00-1.04% of C, 0.2-0.3% of Si, 0.3-0.4% of Mn, 0.3-0.4% of Cr, less than or equal to 0.0020% of Al, less than or equal to 0.0006% of Ti, less than or equal to 0.003% of S, less than or equal to 0.008% of P, less than or equal to 0.03% of Cu, less than or equal to 0.02% of Ni, less than or equal to 0.0015% of O, less than or equal to 0.0030% of N and the balance of Fe and other inevitable impurities; wherein the content of Mn and the content of Si meet the condition that Mn / Si is equal to 1.3-1.6; a temperature control cooling stage; and in the salt bath heat treatment stage, the wire rod subjected to temperature control cooling is heated in a salt bath heating furnace and then sent to a salt pond to be rapidly cooled, the temperature in the salt bath heating furnace ranges from 960 DEG C to 980 DEG C, the temperature of molten salt ranges from 520 DEG C to 540 DEG C, and the wiring speed of the wire rod ranges from 10 m / min to 12 m / min. According to the invention, the problems of limited strength and easy wire breakage during drawing caused by high carbon content of the tire cord steel are solved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, relates to a production method of a 102-grade cord steel wire rod, and also relates to a 102-grade cord steel wire rod prepared by the production method and the 102-grade cord steel wire rod The 102-grade steel cord that is further processed from the wire rod. Background technique [0002] With the rapid development of science and technology and the improvement of people's living standards, the production, sales and ownership of automobiles in my country have leapt to the first place in the world. What follows is that people have raised concerns about the safety, comfort and low energy consumption of automobiles. Therefore, it is necessary to develop tires with smaller rolling resistance, lighter weight and more wear resistance. [0003] As the main skeleton material of the radial tires of automobiles, trucks, and airplanes, every time the strength of steel cords increases by one ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C33/06C21D8/06C22C38/06C22C38/28C22C38/20C22C38/40C22C38/42C22C38/50
Inventor 麻晗孙国才沈奎
Owner ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD
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