CN-121992282-A - Method for improving alloy yield in steelmaking process

Abstract

The invention relates to the technical field of steelmaking and provides a method for improving alloy yield in the steelmaking process, which comprises the following steps of adding slag-forming materials in a converter stage for converter smelting and tapping; when tapping, adding ferrosilicon alloy when the total molten steel outflow amount reaches 1/4, adding half mass ferromanganese alloy when the total molten steel outflow amount reaches 1/3, adding ferromanganese alloy with the residual mass when the total molten steel outflow amount reaches 2/3, and feeding aluminum wires when the total molten steel outflow amount reaches 3/4. By the technical scheme, the problem of low alloy yield in the steelmaking process in the prior art is solved.

Inventors

• TANG GUOXIN
• LI HONGZHOU
• Heng Junda
• ZHANG LEI
• ZHAO XINGTONG

Assignees

• 河北华西特种钢铁有限公司

Dates

Publication Date

20260508

Application Date

20260202

Claims (10)

1. 1. A method for increasing alloy yield in a steelmaking process, comprising the steps of: Adding a slag-forming material into the converter stage to perform converter smelting and tapping; When tapping, adding ferrosilicon alloy when the total molten steel outflow amount reaches 1/4, adding half mass ferromanganese alloy when the total molten steel outflow amount reaches 1/3, adding ferromanganese alloy with the residual mass when the total molten steel outflow amount reaches 2/3, and feeding aluminum wires when the total molten steel outflow amount reaches 3/4.
2. 2. A method of increasing yield of an alloy in a steelmaking process as claimed in claim 1 wherein said slag forming material comprises lime; The addition amount of the slag forming material is 28-30 kg/t steel.
3. 3. The method for improving the alloy yield in the steelmaking process according to claim 1, wherein the tapping temperature is 1640-1670 ℃; and controlling the flow of argon blowing at the bottom of the steel ladle to be 3-4 NL/(min.t) during tapping.
4. 4. The method for improving the alloy yield in the steelmaking process according to claim 1, wherein the adding amount of the ferrosilicon alloy is 5.2-5.4 kg/t steel.
5. 5. The method for improving the alloy yield in the steelmaking process according to claim 1, wherein the total addition amount of the ferromanganese alloy is 19.5-20.5 kg/t steel.
6. 6. The method for improving the alloy yield in the steelmaking process according to claim 1, wherein the feeding amount of the aluminum wire is 0.5-0.6 kg/t steel.
7. 7. A method of increasing the yield of alloy in a steelmaking process as claimed in claim 1 wherein said tapping is completed before entering the LF refining stage.
8. 8. The method of claim 7, wherein the argon blowing process of the LF refining stage includes a first argon blowing and a second argon blowing.
9. 9. The method for improving the alloy yield in the steelmaking process according to claim 8, wherein the argon flow rate of the first argon blowing is 4-4.5 NL/(min.t) and the time is 1-2 min.
10. 10. The method for improving the alloy yield in the steelmaking process according to claim 8, wherein the argon flow rate of the second argon blowing is 1.5-2 NL/(min.t) and the time is 6-9 min.

Description

Method for improving alloy yield in steelmaking process Technical Field The invention relates to the technical field of steelmaking, in particular to a method for improving alloy yield in a steelmaking process. Background In the steel smelting industry, the addition of alloy elements is a key means for regulating and controlling the components of steel and improving the mechanical properties and special purpose suitability of the steel. The production of plain carbon steel, low alloy steel or special steel is carried out by accurately adding alloys such as manganese, silicon, chromium, nickel and the like according to product standards, the adding effect directly determines the quality grade of steel, and meanwhile, the alloy cost occupies higher proportion of the total steelmaking cost, thereby having important influence on the production benefit of enterprises. In the current steelmaking process, alloy oxidation loss caused by improper operation of a converter tapping process is large, or alloy elements are poorly dissolved and unevenly distributed in molten steel, so that the alloy yield is unstable in the production process, waste of alloy resources is caused, component deviation of finished products is caused, and stability of mechanical properties of steel is affected. Disclosure of Invention The invention provides a method for improving alloy yield in a steelmaking process, which solves the problem of low alloy yield in the steelmaking process in the related art. The technical scheme of the invention is as follows: the invention provides a method for improving alloy yield in a steelmaking process, which comprises the following steps: Adding a slag-forming material into the converter stage to perform converter smelting and tapping; When tapping, adding ferrosilicon alloy when the total molten steel outflow amount reaches 1/4, adding half mass ferromanganese alloy when the total molten steel outflow amount reaches 1/3, adding ferromanganese alloy with the residual mass when the total molten steel outflow amount reaches 2/3, and feeding aluminum wires when the total molten steel outflow amount reaches 3/4. As a further technical solution, the slag-forming material comprises lime. As a further technical scheme, the addition amount of the slag forming material is 28-30 kg/t steel. As a further technical scheme, the tapping temperature is 1640-1670 ℃. As a further technical scheme, the ladle bottom argon blowing flow rate is controlled to be 3-4 NL/(min.t) during tapping. As a further technical scheme, the addition amount of the ferrosilicon alloy is 5.2-5.4 kg/t steel. As a further technical scheme, the total addition amount of the ferromanganese alloy is 19.5-20.5 kg/t steel. As a further technical scheme, the feeding amount of the aluminum wire is 0.5-0.6 kg/t steel. As a further technical scheme, the tapping is finished and then enters an LF refining stage. As a further technical scheme, the argon blowing process of the LF refining stage includes a first argon blowing and a second argon blowing. As a further technical scheme, the argon flow of the first argon blowing is 4-4.5 NL/(min.t) and the time is 1-2 min. As a further technical scheme, the argon flow of the second argon blowing is 1.5-2 NL/(min.t) and the time is 6-9 min. According to the invention, in the LF refining stage, the argon flow of the first argon blowing is 4-4.5 NL/(min.t), and the argon flow of the second argon blowing is 1.5-2 NL/(min.t), so that the yield of silicon, manganese and aluminum alloy in molten steel can be further improved. When the temperature is lower than the range, the stirring effect is insufficient, the alloy elements in the molten steel are difficult to fully diffuse, the local component distribution is uneven, the yield of the alloy elements is affected, and when the temperature is higher than the range, the oxidation of the silicon, manganese and aluminum alloy elements is increased, the element alloy is burnt, and the alloy yield is reduced. The working principle and the beneficial effects of the invention are as follows: According to the invention, the yield of silicon, manganese and aluminum elements is improved by controlling the time and sequence of alloy addition during tapping. When the total outflow amount of molten steel reaches 1/4, the ferrosilicon is added, at this time, silicon element generates oxide, and the oxide is diffused and distributed in the following time, so that a favorable low-oxygen environment is created for the addition of ferromanganese and aluminum wires, the burning loss of manganese and aluminum elements caused by the reaction with oxygen is reduced, the silicon element diffuses in the molten steel and interacts with other components in the molten steel, the physicochemical property of the molten steel is adjusted, the dissolving capacity of the molten steel to the ferromanganese and aluminum wires added in the following time is improved, and the manganese and aluminum elements