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Manufacturing method of ultrathin hot-rolled wide strip steel

A manufacturing method and technology for wide-band steel, which are applied in metal rolling, process efficiency improvement, furnace type, etc., can solve problems such as increasing production operation cost, deteriorating steel performance and quality, and breaking, and reduce processing costs and raw materials. Cost, effect of streamlining process

Inactive Publication Date: 2022-03-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Electric furnace steelmaking is used to provide molten steel, and scrap steel is used as the main raw material. Traditional processes such as die casting or thick plate continuous casting have a solidification cooling rate of only 1-10°C / s. These residual elements in scrap steel will be released during the solidification process. Grain boundary segregation occurs, which deteriorates the performance and quality of steel, and cracks and fractures directly occur in severe cases. Therefore, in the traditional process, these harmful elements must be strictly controlled. In the selection of scrap raw materials, some pre-screening is required, and Some special treatment is required in the steelmaking process, such as adding some concentrates for dilution, etc., which undoubtedly increases the cost of production operations

Method used

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  • Manufacturing method of ultrathin hot-rolled wide strip steel
  • Manufacturing method of ultrathin hot-rolled wide strip steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Mix the fine iron powder, coal powder and lime powder in proportion, press them into pellets or agglomerates and dry them; place them in the rotary hearth furnace 1, heat the rotary hearth furnace 1, and make the pellets in the rotary hearth furnace 1 Or the agglomerate is reduced, carburized, melted, and after rapid cooling, the granular iron and slag are separated and discharged separately; the heating temperature is 1380°C.

[0060] The granulated iron discharged from the rotary hearth furnace 1 is transported to the electric furnace 2, and the scrap steel preheated by the preheating device is mixed, melted and smelted in the electric furnace 2 for about 40 minutes, and then the steel is tapped. It is transported to the refining station for treatment. The molten steel is firstly decarburized, desulfurized and dehydrogenated in the VD vacuum degassing furnace 3, and then enters the LF refining furnace 4 for composition adjustment and temperature rise.

[0061] The ref...

Embodiment 2

[0065] Mix the fine iron powder, coal powder and lime powder in proportion, press them into pellets or agglomerates and dry them; place them in the rotary hearth furnace 1, heat the rotary hearth furnace 1, and make the pellets in the rotary hearth furnace 1 Or the agglomerate is reduced, carburized, melted, and after rapid cooling, the granular iron and slag are separated and discharged separately; the heating temperature is 1400°C.

[0066] The granulated iron discharged from the rotary hearth furnace 1 is transported to the electric furnace 2, mixed with the scrap steel preheated by the preheating device, and then melted and smelted in the electric furnace 2 for about 50 minutes. The ladle is transported to the refining station for treatment. The molten steel is first decarburized, desulfurized, and dehydrogenated in the VD vacuum degassing furnace 3, and then enters the LF refining furnace 4 for composition adjustment and temperature rise.

[0067]The refined molten steel ...

Embodiment 3

[0071] Mix the fine iron powder, coal powder and lime powder in proportion, press them into pellets or agglomerates and dry them; place them in the rotary hearth furnace 1, heat the rotary hearth furnace 1, and make the pellets in the rotary hearth furnace 1 Or the agglomerate is reduced, carburized, melted, and after rapid cooling, the granular iron and slag are separated and discharged separately; the heating temperature is 1420°C.

[0072] The granulated iron discharged from the rotary hearth furnace 1 is transported to the electric furnace 2, mixed with the scrap steel preheated by the preheating device, melted and smelted in the electric furnace for about 60 minutes, and then the steel is tapped. Transported to the refining station for treatment, the molten steel is first decarburized, desulfurized, and dehydrogenated in the VD vacuum degassing furnace 3, and then enters the LF refining furnace 4 for composition adjustment and temperature rise.

[0073] The refined molten...

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Abstract

According to the manufacturing method of the ultrathin hot-rolled wide strip steel, fine iron powder, pulverized coal and lime powder are used for completing preparation of granular iron in a rotary hearth furnace, the generated granular iron and waste steel serve as raw materials to be smelted in an electric furnace, the preheating temperature of the waste steel is increased during smelting, and meanwhile the heat efficiency of the electric furnace is effectively improved by means of the high-temperature characteristic of the granular iron; and then the steel plate is prepared through VD vacuum degassing, LF refining, double-roller thin-strip continuous casting and hot continuous rolling. According to the method, the whole technological process is more compact, more environmentally friendly and more efficient, the heat utilization rate is high, the metal yield is higher, the machining cost of the thin-specification strip steel is reduced, the thickness of the obtained steel plate can reach the thickness of a steel plate obtained after cold rolling, 'cold is replaced by hot 'is truly achieved, and the product competitiveness is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of continuous production of metal strips, in particular to a method for manufacturing ultra-thin hot-rolled wide strips. Background technique [0002] In order to save investment cost and production cost, modern iron and steel production enterprises are actively carrying out technological innovation on the existing production process. For this reason, domestic and foreign metallurgical equipment suppliers and iron and steel manufacturers have put forward their own new technology concepts and put them into practical development. Aiming at the existing problems of long hot-strip steel production process and complex equipment, the industrialization technology derived from the twin-roll thin strip continuous casting and rolling technology proposed by Henri Bessemer was gradually developed. Nippon Steel of Japan developed the stainless steel Twin-roll thin strip continuous casting and rolling technology DSC, Nuco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C5/52B21B1/46B22D11/06
CPCC22C33/04C21C5/52B22D11/0622B21B1/463B22D11/06B21B1/46C22C38/04C22C38/02Y02P10/20
Inventor 方园张健吴建春支卫军彭程
Owner BAOSHAN IRON & STEEL CO LTD
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