Smelting method and production process of clean steel

A smelting method and technology for cleaning steel, applied in the direction of improving process efficiency, manufacturing converters, etc., can solve problems such as being unfavorable to improve the cleanliness of molten steel, difficult to deeply purify, etc., to improve the purification effect, promote removal, and reduce the size. Effect

Active Publication Date: 2017-10-10
MAANSHAN HUASHENG METALLURGICAL SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This steel smelting method, in which the molten steel in the ladle is circulated while performing decarburization treatment and adding a deoxidizer for calming treatment, is difficult to continuously perform deep purification, which is not conducive to improving the cleanliness of molten steel

Method used

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  • Smelting method and production process of clean steel
  • Smelting method and production process of clean steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The RH refining furnace of this embodiment is provided with an ascending pipe and a descending pipe at the lower part of the vacuum chamber, and the ascending pipe and the descending pipe are connected. The established pressure difference makes the molten steel enter the vacuum degassing chamber from the ascending pipe, and at the same time blows the driving gas into the ascending pipe, and uses the principle of the bubble pump to draw the molten steel to flow through the degassing chamber and the descending pipe to generate circular motion, and in the vacuum chamber Remove gas.

[0036] Among them, the cleaning agent in the present invention has applied for an invention patent (2017103896965-a molten steel cleaning agent for removing inclusions in molten steel) before. In further research, the applicant through a series of research, the steel The liquid purifying agent is used in the smelting process of clean steel, which reduces the content of harmful elements and impur...

Embodiment 2

[0080] The basic content of this embodiment is the same as that of Example 1, except that the cleaning agent is in the form of granules, the cleaning agent is in the form of spherical particles, and the diameter of the particles is 5-10mm; the cleaning agent includes effective components and bonding components, and the effective components The mass ratio to the adhesive component is (5-10):1, preferably 5:1 in this embodiment.

[0081] The effective components in the purification agent of this embodiment also include graphite powder, red jade soil and magnesium-manganese alloy; the effective components are composed according to the following mass parts, 50-70 parts of metal aluminum, 20-40 parts of lime powder, and 0-30 parts of graphite powder part, 5-20 parts of titanium dioxide, 5-15 parts of silicon carbide powder, 2-4 parts of biomass, 0-1 part of red jade soil, 0-2 part of magnesium-manganese alloy; the present embodiment is 50 kg of metal aluminum, 20 kg of lime powder, ...

Embodiment 3

[0084] The basic content of this embodiment is the same as that of Example 1, except that the adhesive component of the purifying agent also includes starch and kaolin, and the adhesive component is composed of the following parts by mass: 60-80 parts of kaolin, 20-40 parts of sulfonated phenolic resin parts, starch 0-10 parts, oil sands 0-5 parts. This embodiment is composed according to the following mass: 80 kg of kaolin, 40 kg of sulfonated phenolic resin, 5 kg of starch, and 2 kg of oil sand. The detection result of the steel sample is basically the same as in Example 1. The starch and oil sand in the bonding component play the role of bonding in the early stage, and in the later stage, they will participate in the deoxidation reaction in molten steel and generate gas, thereby promoting the floating of inclusions and improving the deoxidation efficiency at the same time.

[0085] Using the cleaning agent of the present invention, in the steelmaking and refining process, ...

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Abstract

The invention discloses a smelting method and a production process of clean steel and belongs to the technical field of steelmaking. Molten iron is subjected to desilicication and desulphurization treatment through molten iron pretreatment and then is smelted in a converter; in the tapping process, a steel ladle slag modifier is added into a steel ladle; the steel ladle slag modifier comprises light-burning dolomite; the content of P and S in the treated molten iron is controlled to meet the relation of P<=0.006% and S<=0.008%; and at the terminal stage of RH refining, a purifying agent with the adding quantity accounting for, by mass, 0.05-1.5% of the molten steel is added into the molten steel. The molten iron is subjected to desilicication and desulphurization treatment through molten iron pretreatment and then is smelted in the converter, in the tapping process, the steel ladle slag modifier is added into the steel ladle, and at the terminal stage of RH refining, the purifying agent is added into the molten steel, so that the purifying effect of the molten steel is improved, and the smelting quality of the clean steel is further improved.

Description

technical field [0001] The invention belongs to the technical field of molten steel smelting, and more specifically relates to a clean steel smelting method and production process. Background technique [0002] With the development of society and the continuous improvement of human needs, people have put forward higher requirements for steel materials. The performance of steel mainly depends on the chemical composition and structure of steel. Harmful elements or impurities in the steel will directly affect the quality of the steel, destroy the continuity of the steel matrix, cause the inhomogeneity of the steel structure, and have a great impact on the ductility, strength, toughness and other properties of the steel. The "new generation of steel materials" is developing in the direction of high cleanliness, and is referred to as "clean steel". "Clean steel" refers to a class of steel products, steel with very strict control requirements for the content of impurity elements...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/06C21C7/076C21C5/28
CPCC21C5/28C21C7/06C21C7/064C21C7/076Y02P10/20
Inventor 万新宇盛鹏飞王海军刘磊从俊强赵志刚赵芃荣哲
Owner MAANSHAN HUASHENG METALLURGICAL SCI & TECH DEV
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