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Low-alloy proportioning steelmaking method

A low-alloy, silicon-manganese alloy technology, applied in the field of metallurgy, can solve problems such as the large increase in the cost of billet smelting, and achieve the effects of reducing the smelting cost, the amount of alloy, and the labor load.

Inactive Publication Date: 2020-01-03
YUNNAN DESHENG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a low-alloy ratio steelmaking method to solve the problem that the production of steel using vanadium-nitrogen alloys and the cost of steel billet smelting are greatly increased in the above-mentioned background technology

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] A low-alloy ratio steelmaking method, the method comprises the following steps:

[0024] S1: Crushing the vanadium-titanium iron ore through a crusher, and then melting the vanadium-titanium-iron ore in a blast furnace;

[0025] S2: Desulfurize the smelted vanadium-titanium molten iron, and the sulfur content in the desulfurized steel is less than 0.020%;

[0026] S3: Smelting the desulfurized vanadium-titanium molten iron in a converter;

[0027] S4: Adjust the ingredients, add silicon carbide and stir evenly when tapping the steel in converter smelting, then add silicon-manganese alloy and stir evenly, then add ferrochromium and stir evenly, finally add vanadium-nitrogen alloy and stir evenly, after all ingredients are added completely, Tap steel within 7 minutes -8 minutes;

[0028] S5: blowing argon to the molten steel, the adjusted molten steel is tapped into the ladle, and the argon gas is blown into the molten steel in the ladle through the porous refractory pl...

Embodiment 2

[0042] A low-alloy ratio steelmaking method, the method comprises the following steps:

[0043] S1: Crushing the vanadium-titanium iron ore through a crusher, and then melting the vanadium-titanium-iron ore in a blast furnace;

[0044] S2: Desulfurize the smelted vanadium-titanium molten iron, and the sulfur content in the desulfurized steel is less than 0.020%;

[0045] S3: Smelting the desulfurized vanadium-titanium molten iron in a converter;

[0046] S4: Adjust the ingredients, add silicon carbide and stir evenly when tapping the steel in converter smelting, then add silicon-manganese alloy and stir evenly, then add ferrochromium and stir evenly, finally add vanadium-nitrogen alloy and stir evenly, after all ingredients are added completely, Tap steel within 7 minutes -8 minutes;

[0047] S5: blowing argon to the molten steel, the adjusted molten steel is tapped into the ladle, and the argon gas is blown into the molten steel in the ladle through the porous refractory pl...

Embodiment 3

[0061] A low-alloy ratio steelmaking method, the method comprises the following steps:

[0062] S1: Crushing the vanadium-titanium iron ore through a crusher, and then melting the vanadium-titanium-iron ore in a blast furnace;

[0063] S2: Desulfurize the smelted vanadium-titanium molten iron, and the sulfur content in the desulfurized steel is less than 0.020%;

[0064] S3: Smelting the desulfurized vanadium-titanium molten iron in a converter;

[0065] S4: Adjust the composition, add silicon carbide and stir evenly when tapping the steel in converter smelting, then add silicon-manganese alloy and stir evenly, then add ferrochrome and stir evenly, finally add vanadium-nitrogen alloy and stir evenly, after all ingredients are added, Tap steel within 7 minutes -8 minutes;

[0066] S5: blowing argon to the molten steel, the adjusted molten steel is tapped into the ladle, and the argon gas is blown into the molten steel in the ladle through the porous refractory plug to push the ...

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Abstract

The invention discloses a low-alloy proportioning steelmaking method. The method specifically comprises the following steps: crushing vanadium-titanium iron ore through a crusher, and smelting the crushed vanadium-titanium iron ore in a blast furnace; desulfurizing the smelted vanadium-titanium molten iron, wherein the sulfur content in the desulfurized steel is less than 0.020%; smelting the desulfurized vanadium-titanium molten iron in a converter; adjusting components, adding silicon carbide and uniformly stirring during smelting and tapping of the converter, adding a silicon-manganese alloy and uniformly stirring, adding ferrochrome and uniformly stirring, finally adding a vanadium-nitrogen alloy and uniformly stirring, and tapping within 7 minutes to 8 minutes after the components arecompletely added; and then carrying out argon blowing treatment on the molten steel. According to the low-alloy proportioning steelmaking method, a certain amount of silicon carbide, silicon-manganese alloy, ferrochrome and vanadium-nitrogen alloy are added during steel tapping, so that the chemical composition control of a billet is optimized, and the percentage of each component is strictly controlled, so that the performance of the prepared steel is improved and the price cost is reduced compared with those of steel only provided with a vanadium-nitrogen alloy.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a low-alloy ratio steelmaking method. Background technique [0002] Starting from November 1, 2018, the hot-rolled ribbed steel bar will implement the GB / T 1499.2-2018 standard. Most enterprises use vanadium-nitrogen alloys for production, and the cost of smelting steel billets has increased significantly. On the premise of ensuring mechanical properties, optimize steel billets For the chemical composition, according to the market price, ferrochromium is used to replace part of the vanadium nitrogen alloy to produce HRB400E steel, and the problem of rising costs is solved by changing the composition and ratio of the added alloy. Contents of the invention [0003] The purpose of the present invention is to provide a low-alloy ratio steelmaking method to solve the problem of large increase in cost of steel production and billet smelting using vanadium-nitrogen alloys proposed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C22C38/02C22C38/04C22C38/24
CPCC22C33/06C22C38/02C22C38/04C22C38/24
Inventor 李贵国岑明安陈云李华国陈贵富刘德斌陈劲松吴摇段建波吴文林邹建军李德辉张华
Owner YUNNAN DESHENG STEEL CO LTD
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