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A high-efficiency and low-cost refining method for smelting low-sulfur steel

A low-sulfur steel, low-cost technology, applied in the field of smelting low-sulfur steel, can solve the problems of difficult slag melting, long refining cycle, large alloy consumption, etc., to save refining costs, shorten smelting time, and quickly turn slag into slag Effect

Active Publication Date: 2022-04-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process can meet the production requirements of low-sulfur steel, there are problems such as difficulty in slag melting, long refining cycle and large alloy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the composition of desulfurization synthetic slag is: refining slag 65%, manganese ore 25%, anthracite 5%, lime 5%.

[0035] This implementation is aimed at the method of smelting low-sulfur steel in 50t LF refining ladle. Before tapping the electric furnace, add 600kg of desulfurized synthetic slag into the refining ladle and bake it together with the ladle; when tapping the electric furnace, take steel sample 1 and measure the temperature, add the molten steel from the electric furnace to the ladle, and the ladle enters the refining station, before starting refining Take steel sample 2 and measure the temperature; LF starts to heat up and refine, and the bottom blowing intensity is 0.006Nm 3 / t min, target temperature 1600℃, add 40kg aluminum, 100kg silicon manganese for deoxidation alloying, take steel sample 3 after smelting for 5 minutes and measure temperature; then add 1400kg desulfurization synthetic slag, SiC 100kg, adjust the bottom blowing...

Embodiment 2

[0039] In this embodiment, the composition of desulfurization synthetic slag is: refining slag 65%, manganese ore 25%, anthracite 5%, lime 5%.

[0040] This implementation is aimed at the method of smelting low-sulfur steel in 50t LF refining ladle. Before tapping the electric furnace, add 800kg of desulfurized synthetic slag into the refining ladle and bake it together with the ladle; when tapping the electric furnace, take steel sample 1 and measure the temperature, add molten steel from the electric furnace to the ladle, and the ladle enters the refining station, before starting refining Take steel sample 2 and measure the temperature; LF starts to heat up and refine, and the bottom blowing intensity is 0.006Nm 3 / t min, the target temperature is 1600℃, add 40kg aluminum, 100kg silicomanganese for deoxidation alloying, take steel sample 3 after smelting for 5 minutes and measure the temperature; then add 1200kg of desulfurization synthetic slag and 100kg of SiC, and adjust ...

Embodiment 3

[0044] In this embodiment, the composition of desulfurization synthetic slag is: refining slag 65%, manganese ore 25%, anthracite 5%, lime 5%.

[0045] This implementation is aimed at the method of smelting low-sulfur steel in 50t LF refining ladle. Before tapping the electric furnace, add 1000kg of desulfurized synthetic slag into the refining ladle and bake it together with the ladle; when tapping the electric furnace, take steel sample 1 and measure the temperature, add the molten steel from the electric furnace to the ladle, and the ladle enters the refining station, before starting the refining Take steel sample 2 and measure the temperature; LF starts to heat up and refine, and the bottom blowing intensity is 0.006Nm 3 / t min, the target temperature is 1600℃, add 40kg aluminum, 100kg silicomanganese for deoxidation alloying, take steel sample 3 after smelting for 5 minutes and measure the temperature; then add 1200kg of desulfurization synthetic slag and 100kg of SiC, an...

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Abstract

The invention relates to a high-efficiency and low-cost refining method for smelting low-sulfur steel, which belongs to the technical field of smelting low-sulfur steel. The desulfurization process of low-sulfur steel is mainly in the ladle refining. Using the newly developed manganese-containing desulfurization synthetic slag for ladle refining can achieve high-efficiency desulfurization and direct alloying of manganese ore. The specific process method is: pre-add desulfurization synthetic slag at the bottom of the refining ladle during the tapping process of the electric furnace or converter, after the refining process starts, heat up and add aluminum for deoxidation, then add the remaining desulfurization slag and SiC particles, and finally add manganese alloy Fine-tune the total ingredients. The refining method shortens the refining time by 3-5 minutes, the sulfur content [s] at the end point of the molten steel is less than or equal to 30ppm, and saves 10-40% of silicon-manganese alloy material, and is a high-efficiency, low-cost low-sulfur steel production method.

Description

technical field [0001] The invention relates to a high-efficiency and low-cost refining method for smelting low-sulfur steel, which belongs to the technical field of smelting low-sulfur steel. Background technique [0002] Low-sulfur steel is widely used in oil and gas pipelines, marine industry and pressure vessels because of its good processing, mechanical and corrosion resistance properties. Sulfur ≤ 50ppm, manganese 0.03 ~ 0.06% seamless steel pipe anti-H 2 S corrosion steel is a typical low sulfur steel grade. Low-sulfur steel strictly controls the sulfur element in steel. At the same time, manganese is an indispensable alloying element in steel, and the addition of manganese alloys in smelting is also necessary. With the country's industrial upgrading, the demand for low-sulfur steel and other special steel products is increasing day by day, so it is of great significance to develop an efficient and low-cost low-sulfur steel refining method. [0003] At present, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C7/06
CPCC21C7/0645C21C7/06C21C7/0006
Inventor 王万林张同生戴诗凡李人升田研肖鸿光孙群保刘合萍
Owner CENT SOUTH UNIV
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