A kind of preparation method of IF steel strip

A technology for continuous casting of steel strips and twin-roll strips, applied in metal rolling and other directions, can solve the problems of high energy consumption, high cost, and long production process of cold-rolled IF steel.

Active Publication Date: 2020-04-03
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a preparation method of IF steel thin strip, which solves the problems of long production process, high cost and large energy consumption of existing cold-rolled IF steel.

Method used

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  • A kind of preparation method of IF steel strip

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In the present embodiment, the preparation method of IF steel thin strip comprises the steps:

[0028] (1) Converter smelting first, then RH vacuum smelting molten steel, the composition of molten steel by mass percentage is: C 0.008%, Mn 0.15%, Si 0.02%, B 0.02%, V 0.04%, P 0.005%, N 0.005%, O 0.002%, S 0.002%, and the balance is Fe. Preheat the temperature of the tundish to 1350°C, preheat the temperature of the ladle to 1300°C, preheat the temperature of the side sealing plate to 1250°C, control the temperature of the molten steel on the inner surface of the ladle to 1700°C, pour the molten steel in the ladle into the middle In the ladle, it is poured from the tundish into the distribution ladle, and then poured from the distribution ladle into the twin-roll thin strip continuous casting equipment. When the molten steel enters the molten pool, the superheat is controlled at 40°C, and the thickness obtained by casting and rolling is 3.0mm cast belt;

[0029] (2) Aft...

Embodiment 2

[0033] In the present embodiment, the preparation method of IF steel thin strip comprises the steps:

[0034] (1) Converter smelting first, then RH vacuum smelting molten steel, the composition of molten steel by mass percentage is: C 0.0005%, Mn0.8%, Si 0.1%, B 0.01%, V 0.09%, P 0.08%, N 0.003%, O 0.001%, S 0.001%, and the balance is Fe. Preheat the temperature of the tundish to 1300°C, preheat the temperature of the ladle to 1350°C, preheat the temperature of the side sealing plate to 1270°C, control the temperature of the molten steel on the inner surface of the ladle to 1720°C, pour the molten steel in the ladle into the middle In the ladle, it is poured from the tundish into the distribution ladle, and then poured from the distribution ladle into the twin-roll thin strip continuous casting equipment. When the molten steel enters the molten pool, the superheat is controlled to be 30°C, and the thickness obtained by casting and rolling is 3.5mm cast belt;

[0035] (2) Aft...

Embodiment 3

[0039] In the present embodiment, the preparation method of IF steel thin strip comprises the steps:

[0040] (1) Converter smelting first, then RH vacuum smelting molten steel, the composition of molten steel by mass percentage is: C 0.005%, Mn0.3%, Si 0.08%, B 0.013%, V 0.07%, P 0.01%, N 0.001%, O 0.0012%, S 0.0012%, and the balance is Fe. Preheat the temperature of the tundish to 1320°C, preheat the temperature of the cloth ladle to 1320°C, preheat the temperature of the side sealing plate to 1350°C, control the temperature of the molten steel on the inner surface of the ladle to 1710°C, pour the molten steel in the ladle into the middle In the ladle, it is poured from the tundish into the distribution ladle, and then poured from the distribution ladle into the twin-roll thin strip continuous casting equipment. When the molten steel enters the molten pool, the superheat is controlled to be 10°C, and the thickness obtained by casting and rolling is 1.8mm cast belt;

[0041...

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Abstract

The invention belongs to the technical field of steel alloy materials, and particularly relates to a preparation method of an IF steel strip. The IF steel strip comprises the following components of,in percentage, by mass, 0.0005-0.008% of C, 0.15-0.8% of Mn, 0.02-0.1% of Si, 0.01%-0.02% of B, 0.04-0.09% of V, 0.005-0.08% of P, less than or equal to 0.005 percent of N, less than or equal to 0.002% of O, less than or equal to 0.002% of S, and the balance of Fe. The preparation method comprises the following steps of, (1) smelting molten steel, preheating the tundish, distributing the flow bagand sealing the side seal plate; (2) pouring the tundish; (3) pouring the flow distribution bag; (4) casting and rolling through double-roller thin strip continuous casting equipment; (5) carrying outprimary hot rolling on the cast strip; (6) rolling; (7) pickling; (8) cold rolling; (9) continuously annealing. The thickness of the IF steel strip is 0.5-1.2 mm, the width is 300-1500 mm, and the yield strength is 280-320 Mpa, the tensile strength is 400-490 Mpa, and the elongation after fracture is 38-47%. The preparation method has the beneficial effects of being short in preparation process,low in cost and low in energy consumption.

Description

technical field [0001] The invention belongs to the technical field of iron and steel alloy materials, and in particular relates to a preparation method of an IF steel thin strip. Background technique [0002] IF steel, also known as interstitial-free steel, is characterized by relatively low carbon content, and titanium and niobium elements are usually added to form carbon and nitrides of titanium and niobium. Since the carbon and nitrogen atoms in IF steel are fixed and there are no interstitial atoms, it is beneficial to the development of texture during the annealing process, so IF steel has excellent deep drawing performance. With the development needs of the modern automobile industry, high-strength IF steel has also been developed to a certain extent. The strength of high-strength IF steel is mainly improved by solid solution strengthening, and the main method is to add solid solution strengthening elements such as phosphorus, manganese, and silicon to the steel to i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/04C22C38/02C22C38/04C22C38/12B21B1/46B22D11/06B22D11/18
CPCB21B1/463B22D11/0622B22D11/18C21D8/0405C21D8/0415C21D8/0426C21D8/0473C22C38/002C22C38/02C22C38/04C22C38/12
Inventor 窦为学袁国王鹤松康健曹光明张元祥王国栋
Owner NORTHEASTERN UNIV LIAONING
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