Metal rod for refining and purifying RH (Rockwell Hardness) molten steel

A metal rod and molten steel technology, applied in the field of metal rods, can solve the problems of difficult processing, silicon increase in molten steel, and difficulty, and achieve the effects of facilitating use, reducing smelting costs, and improving the quality of molten steel

Inactive Publication Date: 2013-03-06
上海盛宝冶金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing several types of cored wires containing calcium or calcium alloys still have the following defects: silicon-containing low-calcium alloy cored wires, such as CaSi, have the disadvantage of increasing silicon in molten steel during the refining process outside the furnace
Some enterprises use metallic pure calcium as the inner core, and steel strips over 1mm as the outer cladding, trying to feed the metallic calcium core into the deeper part of the molten steel. However, when the steel strip is too thick, it is difficult to process and the cost is high. It is more difficult, and sometimes it is necessary to anneal the semi-finished cored wire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The specification of the inner core pure calcium rod of the present embodiment: 7.0 35mm, the choice of its diameter is based on the consideration of specific gravity, and it is usually necessary to ensure that the specific gravity of the entire metal rod is not less than 3g / cm3; the choice of its length is based on the consideration of the difficulty of feeding molten steel.

[0023] Outer cladding specifications: 1.5mm thick steel strip sealed.

[0024] The specific gravity of solid pure calcium rod is 4.10g / cm3.

[0025] The use of the above products in the RH process of a steel plant to smelt a certain brand of IF steel is as follows:

[0026] (1) Adjust the position of the RH descending pipe and the feeding pipe so that they correspond to the feeding pipe;

[0027] (2) After the ladle is transported to the RH station, the temperature is measured and sampled. The actual temperature of the molten steel during the smelting process is 10~15°C higher than the norma...

Embodiment 2

[0033] Embodiment 2: the specification of the inner core pure calcium rod of the present embodiment: 6.0 35mm, outer cladding specification: 1.5mm thick steel strip sealed, filled with iron powder with a thickness of 0.5mm between the outer cladding and the inner core, the specific gravity of the solid core pure calcium rod is 4.85g / cm3.

[0034] The use of the above products in the RH process of a steel plant to smelt a certain brand of IF steel is as follows:

[0035] (1) Adjust the position of the RH descending pipe and the feeding pipe so that they correspond to the feeding pipe;

[0036] (2) After the ladle is transported to the RH station, the temperature is measured and sampled. The actual temperature of the molten steel during the smelting process is 10~15°C higher than the normal production temperature, and the composition is adjusted. After the deoxidation alloying is completed, and when the vacuum degree of the vacuum chamber is 65~300Pa , the product of this em...

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Abstract

The invention belongs to a refining technology outside a steel refining furnace and relates to a metal rod for refining and purifying for desulfurizing, deoxidizing and removing impurities for RH (Rockwell Hardness) refining. The metal rod comprises an inner core and an outer cladding layer, wherein the outer cladding layer is coated on the outer surface of the inner core; the inner core is a pure metal calcium rod; the inner rod is in the form of a cylinder or a similar cylinder; the metal rod adopts a pure metal calcium rod outer-cladding steel outer layer so as to have certain specific gravity; and when being thrown to the molten steel, the metal rod can quickly enter the deep part of the molten steel without spilling, thus avoiding a spilling and nitriding problem of the molten steel during wire injection. Besides, the metal rod has high desulfurizing and deoxidizing ability, and can stably control the dimension and quantity distribution of impurities in the molten steel, and optimizes the site operation is optimized while ensuring the quality of the molten steel is ensured.

Description

technical field [0001] The invention belongs to the refining technology outside the steelmaking furnace, and relates to a metal rod for refining and purifying for desulfurization, deoxidation and removal of inclusions for RH refining. Background technique [0002] With the development of science, technology and economy, users have increasingly strict requirements on steel quality. Sulfur is one of the harmful elements in steel. It forms sulfide inclusions in steel, which will reduce the ductility and toughness of steel, especially the impact toughness. When sulfur exists in the form of iron sulfide, it will cause hot embrittlement of steel and anisotropy of steel after rolling, so the sulfur content in steel must be strictly limited. Especially for high value-added steel such as silicon steel, the requirements for sulfur content are more stringent. [0003] The impact of inclusions on the mechanical properties and process properties of steel is mainly manifested in reducin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/06C21C7/064
Inventor 刘欣隆孙树森周四明聂爱军
Owner 上海盛宝冶金科技有限公司
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