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A smelting method for improving the fluidity of molten steel after refining and desulfurization of rebar

A smelting method and rebar technology, which is applied in the field of steel manufacturing, can solve problems such as poor fluidity of molten steel, and achieve the effect of ensuring normal pouring and improving fluidity of molten steel

Active Publication Date: 2022-07-01
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a smelting method for improving the fluidity of molten steel after refining and desulfurization of threaded steel, and to solve the problem of poor fluidity of molten steel caused by the refining and desulfurization process of existing threaded steel

Method used

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  • A smelting method for improving the fluidity of molten steel after refining and desulfurization of rebar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] converter smelting

[0047] ① Loading 41 tons of scrap steel, 119 tons of molten iron, and a total of 160 tons of molten iron. The composition of molten iron into the furnace is Si: 0.31%, S: 0.056%, and temperature T: 1326 °C; desulfurization process;

[0048] ② The top-bottom re-blowing mode is adopted, the amount of lime added: 5850kg, the tapping temperature: 1642℃, and the tapping amount is 149 tons.

[0049] (2) After furnace and argon station treatment

[0050] After the furnace alloying operation, the total bottom blowing time was 4min, and the sampling at the argon station was C: 0.204%, Si: 0.29%, Mn: 1.37%, P: 0.032%, S: 0.053%, V: 0.024%.

[0051] (3) LF refining

[0052] ①Add slag-forming material before refining and power transmission, add 690kg of lime, add 100kg of fluorite, and add 60kg of carbon powder during power transmission for diffusion and deoxidation;

[0053] ②Power on for 8 minutes, power off, blow argon at the bottom of the large ladle, s...

Embodiment 2

[0060] (1) Converter smelting

[0061] ① Loading 40 tons of scrap steel, 121 tons of molten iron, and a total of 161 tons of molten iron. The composition of molten iron into the furnace is Si: 0.28%, S: 0.067%, and temperature T: 1319 °C; desulfurization process;

[0062] ② The top-bottom re-blowing mode is adopted, the amount of lime added: 5950kg, the tapping temperature: 1645℃, and the tapping volume is 150 tons.

[0063] (2) After furnace and argon station treatment

[0064] After the furnace alloying operation, the total bottom blowing time is 5min, and the sampling at the argon station is C: 0.217%, Si: 0.29%, Mn: 1.39%, P: 0.035%, S: 0.062%, V: 0.023%.

[0065] (3) LF refining

[0066] ①Add slag-forming material before refining and power transmission, add 800kg of lime, add 150kg of fluorite, and add 60kg of calcium carbide during power transmission for diffusion and deoxidation;

[0067] ②Power on for 8 minutes, power off, blow argon at the bottom of the ladle, sti...

Embodiment 3

[0074] converter smelting

[0075] ① Loading 42 tons of scrap steel, 121 tons of molten iron, and a total of 163 tons of molten iron. The composition of molten iron into the furnace is Si: 0.42%, S: 0.036%, and the temperature is T: 1363 °C; the scrap contains iron castings, and the molten steel in the sampling furnace is S : 0.076%, it is determined that the refining and desulfurization process is adopted in the next step;

[0076] ② The top and bottom re-blowing mode is adopted, the amount of lime added: 5600kg, the tapping temperature: 1650 ℃, and the tapping amount is 150 tons.

[0077] (2) After furnace and argon station treatment

[0078] Alloying operation after the furnace, the total time of bottom blowing is 4min, and the sampling at the argon station is C: 0.211%, Si: 0.30%, Mn: 1.36%, P: 0.037%, S: 0.075%, V: 0.023%.

[0079] (3) LF refining

[0080] ①Add slag-forming material before refining and power transmission, add 1100kg of lime, add 200kg of fluorite, and ...

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Abstract

The invention discloses a smelting method for improving the fluidity of molten steel after refining and desulfurization of rebar. The refining and desulfurization process of rebar comprises: converter smelting - post-furnace and argon station treatment - LF refining - continuous casting. The LF refining process includes: refining and sending The slag-forming material lime is added before electricity, and fluorite is added at the same time to adjust the fluidity of the slag and control the alkalinity of the refining slag to meet the standard requirements. During the power transmission process, diffusion and deoxidation are carried out. After the slag is completely melted, the power is cut off. The desulfurization efficiency meets the standard requirements; particle steel is added to increase the oxygen content in the molten steel, and the fluidity of the molten steel is improved; the components of the molten steel are adjusted to ensure that the components of the molten steel meet the standard requirements, and the temperature is qualified for continuous casting; the technical scheme provided by the present invention , After the sulfur content in the molten steel through the refining process reaches the standard requirements, an appropriate amount of high-quality particle steel of oxidizing material is added to improve the fluidity of the molten steel, avoid the clogging of the pouring nozzle, and make the continuous casting process flow smoothly.

Description

technical field [0001] The invention relates to the technical field of steel manufacturing, in particular to a smelting method for improving the fluidity of molten steel after refining and desulfurization of rebar. Background technique [0002] As an important building material, rebar supports the development of the national economy and is widely used in real estate development, self-built houses by rural households, affordable housing and infrastructure construction. Most domestic iron and steel plants use the "converter-argon station-continuous casting" straight-up process to produce rebar, and some iron and steel plants also use the "converter-argon station- LF refining furnace - continuous casting" refining process. [0003] The main raw materials of converter steelmaking are molten iron and scrap steel. After the blast furnace is suspended for a long time and the furnace condition is poor, the molten iron composition is prone to fluctuation, especially the high sulfur ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21C5/28C21C7/06C21C7/064C22C38/02C22C38/04C22C38/12C22C38/60
CPCC22C33/06C21C7/064C21C7/06C21C5/28C22C38/02C22C38/04C22C38/12C22C38/60
Inventor 韦泽洪刘敏汪晛
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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