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Grade 90 or higher steel cord, cord steel and production method thereof

A production method and technology for cord steel, applied in the field of steel cord, can solve the problems of segregation, damage to the continuity of steel, and difficulty in manufacturing cord steel, and achieve the effect of reducing macrosegregation

Active Publication Date: 2022-07-22
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the mainstream cord steels on the market are grade 72 (that is, the carbon content is 0.72%) and grade 82 (that is, the carbon content is 0.82%). As we all know, increasing the carbon content is the most important means of strengthening the cord steel. However, , with the increase of carbon content, the manufacture of cord steel is more and more difficult, especially after the increase of carbon content, it is easy to cause carbon segregation, form abnormal structures such as reticular cementite and martensite, and destroy the continuity of steel. property, resulting in wire breakage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Smelting of molten steel: converter smelting is used, and argon blowing, out-of-furnace refining and soft blowing are used for refining to control the chemical composition of molten steel, so that the carbon content in molten steel is ≥ 0.90%.

[0042] (2) Continuous casting: electromagnetic induction heating device is used to control the temperature of molten steel in the tundish, control the superheat degree of the molten steel in the tundish to 15℃, control the positive and negative error of the degree of superheat ≤3℃, and the casting speed is 0.64m / min; use a continuous casting machine with a cross-sectional size of 306mm × 397mm at the outlet of the mold, the current of the electromagnetic stirring of the mold is 750A, and the frequency is 2Hz; the total reduction during the solidification of the continuous casting billet is 26mm, specifically , Since the No. 5 tension leveler corresponding to the horizontal section of the continuous casting machine starts to ...

Embodiment 2

[0053] (1) Smelting of molten steel: converter smelting is used, and argon blowing, out-of-furnace refining and soft blowing are used for refining, and the chemical composition of molten steel is adjusted to make the carbon content in molten steel ≥ 0.90%.

[0054] (2) Continuous casting: The electromagnetic induction heating device is used to control the temperature of the molten steel in the tundish. min; use a continuous casting machine with a cross-sectional size of 306mm × 397mm at the outlet of the mold, the current of the electromagnetic stirring of the mold is 750A, and the frequency is 2Hz; the total reduction during the solidification of the continuous casting billet is 23mm, specifically , Since the No. 5 tension leveling machine corresponding to the horizontal section of the continuous casting machine starts to press down, the reduction amounts of the No. 5 to No. 11 tension leveling machines are 2mm, 3mm, 4mm, 4mm, 4mm, 4mm, 2mm respectively. The size of the final...

Embodiment 3

[0065] (1) Smelting of molten steel: converter smelting is used, and argon blowing, out-of-furnace refining and soft blowing are used for refining to control the chemical composition of molten steel, so that the carbon content in molten steel is ≥ 0.90%.

[0066] (2) Continuous casting: The electromagnetic induction heating device is used to control the temperature of the molten steel in the tundish. / min; use a continuous casting machine with a cross-sectional size of 306mm × 397mm at the outlet of the mold for casting, the current of the electromagnetic stirring of the mold is 750A, and the frequency is 2Hz; the total reduction during the solidification of the continuous casting billet is 20mm, specifically On the ground, the No. 5 tension leveling machine corresponding to the horizontal section of the continuous casting machine starts to press down. The size of the continuous casting slab after lowering is 280mm×396mm;

[0067] The continuous casting billet was sampled at ...

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Abstract

The invention discloses a steel cord of grade 90 or above, a cord steel and a production method thereof. During continuous casting, induction heating is used for the tundish, the superheat degree of molten steel is 15±3℃, and the total reduction during the solidification process of the continuous casting billet is 20~26mm. The furnace temperature of the preheating section is 910~960℃, the furnace temperature of the first heating section is 1040~1090℃, the furnace temperature of the second heating section is 1180~1220℃, and the temperature of the soaking section is 1240~1280℃. ~390min; the furnace temperature of the preheating section of the heating furnace during rolling is 840~890℃, the furnace temperature of the heating section is 930~1080℃, and the furnace temperature of the soaking section is 1050~1080℃; The average cooling rates during phase transition are 15~20°C / s and 5~10°C / s, respectively. Solved the problem of limited strength of cord steel due to high carbon content.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a method for producing a cord steel of grade 90 or above, and also to a cord steel of grade 90 or above prepared by the production method, and a further step of the cord steel of grade 90 or above. Machined steel cord. Background technique [0002] Steel cord is a common rubber skeleton material, which is widely used in radial tires of various automobiles, trucks and airplanes. my country's automobile production, sales and ownership ranks first in the world. With the development of society and economy, people have put forward higher requirements for the safety, comfort and low energy consumption of automobiles. Therefore, it is necessary to develop products with smaller rolling resistance and lighter weight. , More wear-resistant tire products. As an important skeleton of tires, steel cords play a central role in tire load-bearing. Increasing the strength of steel ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/04C21D8/06C21D9/52
CPCB21C37/04C21D8/065C21D9/525
Inventor 麻晗李强
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE