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Method for smelting high-quality carbon steel in 120t converter

A high-quality carbon steel and converter smelting technology, applied in the field of carbon steel smelting, can solve problems such as back-drying, high smelting cost, and difficult dephosphorization, achieve weak carbon-oxygen reaction speed, increase dephosphorization rate, and short smelting cycle Effect

Inactive Publication Date: 2021-08-03
山东鲁丽钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, low-temperature and low-silicon molten iron is one of the most prominent problems faced by converter smelting. Various iron and steel enterprises have encountered great difficulties in their smelting process control and end point control, and no ideal system solution has been formed.
[0005] The existing low-temperature and low-silicon molten iron converter smelting mainly has problems such as high smelting cost, long smelting cycle, low production efficiency, back-drying, serious splashing, and difficult dephosphorization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for smelting high-quality carbon steel in a 120t converter, comprising the following steps:

[0032] (1) Preheat scrap steel to 800°C in the ladle or in the scrap steel hopper in front of the furnace;

[0033] (2) Add the preheated steel scrap to the molten iron after blast furnace smelting. The molten iron after blast furnace smelting contains 4.3% carbon, 0.2% silicon and 0.15% phosphorus. Silicon low-phosphorus hot metal, the temperature is 1270 ℃, the carbon content in low-temperature low-silicon and low-phosphorus hot metal is 3.8%, the silicon content is 0.1%, and the phosphorus content is 0.135%;

[0034] (3) In the 120t converter, after the slag is splashed from the steel in the previous furnace, the slag is splashed to the bottom of the furnace without dumping the slag;

[0035] (4) Add 35t of steel scrap, cover the dry slag, and add lime;

[0036] (5) Adding low-temperature, low-silicon and low-phosphorus molten iron, the iron flow impacts on the sc...

Embodiment 2

[0046] A method for smelting high-quality carbon steel in a 120t converter, comprising the following steps:

[0047] (1) Preheat scrap steel to 900°C in the ladle or in the scrap steel hopper in front of the furnace;

[0048] (2) Add the preheated steel scrap to the molten iron after blast furnace smelting. The molten iron after blast furnace smelting contains 4.3% carbon, 0.3% silicon and 0.14% phosphorus. Silicon low-phosphorus hot metal, the temperature is 1275 ℃, the carbon content in low-temperature low-silicon and low-phosphorus hot metal is 3.8%, the silicon content is 0.2%, and the phosphorus content is 0.13%;

[0049] (3) In the 120t converter, after the slag is splashed from the steel in the previous furnace, the slag is splashed to the bottom of the furnace without dumping the slag;

[0050] (4) Add 36t of steel scrap, cover the dry slag, and add lime;

[0051] (5) Adding low-temperature, low-silicon and low-phosphorus molten iron, the iron flow impacts on the scr...

Embodiment 3

[0061] A method for smelting high-quality carbon steel in a 120t converter, comprising the following steps:

[0062] (1) Preheat scrap steel to 1000°C in the ladle or in the scrap steel hopper in front of the furnace;

[0063] (2) Add the preheated steel scrap to the molten iron after blast furnace smelting. The molten iron after blast furnace smelting contains 4.3% carbon, 0.4% silicon and 0.14% phosphorus. Silicon low-phosphorus hot metal, the temperature is 1275 °C, the carbon content in low-temperature low-silicon and low-phosphorus hot metal is 3.8%, the silicon content is 0.3%, and the phosphorus content is 0.135%;

[0064] (3) In the 120t converter, after the slag is splashed from the steel in the previous furnace, the slag is splashed to the bottom of the furnace without dumping the slag;

[0065] (4) Add 37t of steel scrap, cover the dry slag, and add lime;

[0066] (5) Adding low-temperature, low-silicon and low-phosphorus molten iron, the iron flow impacts on the ...

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Abstract

The invention belongs to the technical field of carbon steel smelting, and particularly relates to a method for smelting high-quality carbon steel in a 120t converter. The method comprises the following steps of preheating scrap steel, diluting molten iron, reserving slag, adding the scrap steel to cover the slag, adding the molten iron, changing a gun, changing the pressure, supplying high-strength oxygen, tapping, and splashing the slag to protect the converter. The method has the advantages of being low in smelting cost, short in smelting period, high in production efficiency and the like, the temperature is low in the processes of low-temperature low-silicon molten iron, heat balance transfer-in, high scrap steel ratio and low-temperature tapping, the carbon-oxygen reaction speed is relatively low, and serious dry returning and splashing are avoided. The full-slag-remaining operation solves the problems that the slag amount of low-silicon molten iron is small, metal splashing is serious, and dephosphorization is difficult. The problems of large slag quantity and serious splashing caused by continuous slag remaining are solved by a back slag discharging process. Based on the gun changing pressure changing operation of the basic gun position, through the whole-process slag opening and low-temperature tapping, the dephosphorization rate of the converter can be remarkably improved, and it is guaranteed that the phosphorus content at the end point is lower than 0.02%.

Description

technical field [0001] The invention belongs to the technical field of carbon steel smelting, and in particular relates to a method for smelting high-quality carbon steel in a 120t converter. Background technique [0002] Carbon steel is the earliest and most used basic material in modern industry. While the industrial countries in the world are striving to increase the output of low-alloy high-strength steel and alloy steel, they also pay great attention to improving the quality of carbon steel and expanding the variety and scope of use. [0003] At present, the output of carbon steel accounts for about 80% of the total output of steel in various countries. It is not only widely used in construction, bridges, railways, vehicles, ships and various machinery manufacturing industries, but also in the modern petrochemical industry. , marine development, etc., have also been widely used. [0004] According to the different carbon content, the common high-quality carbon steels ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/32
CPCC21C5/32Y02P10/20
Inventor 薛明亮傅士刚郭栋魏森黄彦飞魏文升杜建勇郭素萍
Owner 山东鲁丽钢铁有限公司
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