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Method for realizing low Young's modulus of oxide inclusion in tire cord steel

A technology of oxide and cord steel, which is applied in the field of metallurgy, can solve the problems that affect the drawing and joint performance of cord steel wire rod, the target composition area is small, and the inclusions are not easy to achieve miniaturization and easy control , to avoid the effect of precipitation of inclusions

Inactive Publication Date: 2018-05-08
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the control method based on "low melting point of inclusions" can control most of the inclusions in steel as plastic inclusions, there are two shortcomings: 1) The target composition area of ​​inclusions is very small, such as figure 1 As shown in area A in the middle, the actual production process is difficult to operate, and it is not easy to make the inclusions completely in the low melting point region; 2) In order to make the inclusions have a low melting point, [Al] in the steel needs to be controlled to 0.0004 wt.%. It shows that under the condition of [Al] content, Al will still be precipitated during molten steel casting 2 o 3 Hard inclusions that seriously affect the drawing and plying properties of cord steel wire rods

Method used

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  • Method for realizing low Young's modulus of oxide inclusion in tire cord steel
  • Method for realizing low Young's modulus of oxide inclusion in tire cord steel
  • Method for realizing low Young's modulus of oxide inclusion in tire cord steel

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Embodiment 1

[0033] A method for realizing low Young's modulus of oxide inclusions in cord steel includes converter steelmaking, LF refining, soft blowing and continuous casting processes, and the specific process steps are as follows:

[0034] (1) Converter steelmaking process: The tapping temperature of the converter is controlled at 1655°C, and the final molten steel: C: 0.50 wt.%, P: 0.0080 wt.%, S: 0.0090 wt.%; Carbon ferromanganese 0.65kg / t steel, microaluminosilicon ferrosilicon 5.5kg / t steel for pre-deoxidation; after the completion of tapping, add refining pre-melted slag to the steel, the amount of pre-melted slag added is 7.5kg / t steel, pre-deoxidized The composition of the slag is: CaO: 43 wt.%, SiO 2 : 45 wt.%, Al 2 o 3 : 6 wt.%, MgO: 6 wt.%; the whole tapping process is controlled within 10min;

[0035] (2) LF refining process: the ladle is transported to the LF refining station for refining, silicon oxide is added to adjust the composition of refining slag, and CaO / SiO 2...

Embodiment 2

[0039] A method for realizing low Young's modulus of oxide inclusions in cord steel includes converter steelmaking, LF refining, soft blowing and continuous casting processes, and the specific process steps are as follows:

[0040] (1) The tapping temperature of the converter is controlled at 1675°C, and the molten steel at the end point: C: 0.38 wt.%, P: 0.0090 wt.%, S: 0.0080wt.%; mid-carbon ferromanganese and micro Ferrosilicon is pre-deoxidized, and the addition ratio is 0.55kg / ton of medium-carbon ferromanganese and 4.5kg / t of steel for micro-aluminosilicon; after the completion of tapping, add refining pre-melting slag to the steel, and the amount of pre-melting slag added 6.5kg / t steel, the composition of the pre-slag is: CaO: 41 wt.%, SiO 2 : 43 wt.%, Al 2 o 3 : 7 wt.%, MgO: 9 wt.%, the whole tapping process is controlled within 8min;

[0041] (2) The ladle is transported to the LF station for refining, and silicon oxide is added to adjust the composition of the ref...

Embodiment 3

[0045] A method for realizing low Young's modulus of oxide inclusions in cord steel includes converter steelmaking, LF refining, soft blowing and continuous casting processes, and the specific process steps are as follows:

[0046] (1) The tapping temperature of the converter is controlled at 1650°C, and the molten steel at the end point: C: 0.14 wt.%, P: 0.0080 wt.%, S: 0.0080wt.%; add medium-carbon ferromanganese and micro Ferrosilicon is pre-deoxidized, and the addition ratio is medium carbon ferromanganese 0.70kg / t steel, micro-aluminosilicon ferrosilicon 6.0kg / t steel; after the completion of tapping, add refining pre-melted slag to the steel, the amount of pre-melted slag added 6.0kg / t steel, the composition of the pre-slag is: CaO: 40 wt.%, SiO 2 : 40 wt.%, Al 2 o 3 : 5 wt.%, MgO: 10 wt.%, the whole tapping process is controlled within 12min;

[0047] (2) The ladle is transported to the LF station for refining, and silicon oxide is added to adjust the composition of ...

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Abstract

The invention discloses a method for realizing low Young's modulus of oxide inclusion in tire cord steel. The method comprises a converter steelmaking process, an LF refining process, a soft blowing process and a continuous casting process; the converter steelmaking process comprises the step that refining premelting slag of 6-8kg / t of steel is added in the steel after tapping is finished, whereinthe premelting slag comprises, by weight, 40-50% of CaO, 40-45% of SiO2, 5-10% of Al2O3 and 5-10% of MgO, and CaO / SiO2 is controlled to be less than or equal to 1.0. By designing special smelting operation, the oxide inclusion in steel has lower Young's modulus, the inclusion can better adapt to the following drawing process characteristics of a cord steel wire rod, the inclusion can be broken and separated by the huge pressure stress and compression ratio of steel in the drawing process, and fine control of the oxide inclusion can be realized. The method for realizing low Young's modulus ofthe oxide inclusion in the tire cord steel solves the problem of wire breaking caused by large-size non-deformation inclusions in the tire cord steel, and significantly improves the drawing and stranding performance of the cord steel wire rod.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for realizing low Young's modulus of oxide inclusions in cord steel. Background technique [0002] Cord steel, also known as steel cord, is a steel wire rope made of several thin steel wires of φ0.15-0.38mm. It is mainly used to make tire meridians. With the rapid development of my country's automobile industry, the domestic cord steel market demand is strong. Broken wires in the drawing and plying process are the biggest technical problem in the cord steel production process. Frequent broken wires seriously affect the production efficiency of steel wire companies, and even directly lead to the scrapping of cord steel wire rods. Studies have shown that large-sized, non-deformable hard Al in steel 2 o 3 Inclusions are an important cause of wire breakage in cord steel. [0003] Reducing the size of the inclusions in steel and making the inclusions small ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076C21C5/28C21C7/06C21C7/00C22C38/04C22C38/02B22D11/111
CPCB22D11/111C21C5/28C21C7/0006C21C7/0025C21C7/0087C21C7/06C21C7/076C22C38/02C22C38/04Y02P10/20
Inventor 王昆鹏赵昊乾孟耀青韩广杰田新中刘宏伟王郢
Owner XINGTAI IRON & STEEL
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