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Smelting method capable of improving fluidity of molten steel after refining and desulfurizing of deformed steel bar

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: 2021-08-10
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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  • Smelting method capable of improving fluidity of molten steel after refining and desulfurizing of deformed steel bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Converter smelting

[0051] ① Load 41 tons of scrap steel, 119 tons of molten iron, and a total load of 160 tons. The composition of molten iron into the furnace is Si: 0.31%, S: 0.056%, and temperature T: 1326°C; desulfurization process;

[0052] ② The top-bottom combined blowing mode is adopted, the amount of lime added: 5850kg, the tapping temperature: 1642°C, and the tapping amount is 149 tons.

[0053] (2) Post-furnace and argon station treatment

[0054] After the furnace alloying operation, the total time of bottom blowing is 4min, and the sampling of C: 0.204%, Si: 0.29%, Mn: 1.37%, P: 0.032%, S: 0.053%, V: 0.024%.

[0055] (3) LF refining

[0056] ① Add slagging material before refining and power transmission, lime addition is 690kg, 100kg fluorite is added, and 60kg carbon powder is added during power transmission for diffusion deoxidation;

[0057] ② Power on for 8 minutes, power off, blow argon at the bottom of the large ladle, stir for 2 minutes, take s...

Embodiment 2

[0064] (1) Converter smelting

[0065] ① Load 40 tons of scrap steel, 121 tons of molten iron, and a total load of 161 tons. The composition of molten iron into the furnace is Si: 0.28%, S: 0.067%, and temperature T: 1319°C; desulfurization process;

[0066] ② Adopt the top-bottom combined blowing mode, the amount of lime added: 5950kg, the tapping temperature: 1645 ℃, and the tapping amount is 150 tons.

[0067] (2) Post-furnace and argon station treatment

[0068] After the furnace alloying operation, the total time of bottom blowing is 5min, and the argon station samples C: 0.217%, Si: 0.29%, Mn: 1.39%, P: 0.035%, S: 0.062%, V: 0.023%.

[0069] (3) LF refining

[0070] ① Add slagging material before refining and power transmission, lime addition is 800kg, 150kg fluorite is added, and 60kg calcium carbide is added during power transmission for diffusion deoxidation;

[0071] ② Power on for 8 minutes, power off, blow argon at the bottom of the large ladle, stir for 2 minu...

Embodiment 3

[0078] Converter smelting

[0079] ① Charge 42 tons of scrap steel, 121 tons of molten iron, and a total load of 163 tons. The composition of the molten iron into the furnace is Si: 0.42%, S: 0.036%, and the temperature T: 1363°C; the scrap steel contains iron castings, and the molten steel in the furnace is sampled : 0.076%, it is determined that the refining desulfurization process will be adopted in the next step;

[0080] ② The top-bottom combined blowing mode is adopted, the amount of lime added: 5600kg, the tapping temperature: 1650°C, and the tapping amount is 150 tons.

[0081] (2) Post-furnace and argon station treatment

[0082] After the furnace alloying operation, the total time of bottom blowing is 4min, and the argon station samples C: 0.211%, Si: 0.30%, Mn: 1.36%, P: 0.037%, S: 0.075%, V: 0.023%.

[0083] (3) LF refining

[0084] ① Add slag-making material before refining and power transmission, the amount of lime added is 1100kg, 200kg of fluorite is added, ...

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Abstract

The invention discloses a smelting method capable of improving fluidity of molten steel after refining and desulfurizing of a deformed steel bar. A deformed steel bar refining and desulfurizing process comprises the steps of converter smelting, post-furnace and argon station treatment, LF refining and continuous casting; and an LF refining process comprises the steps of: adding slag making material lime before refining and power transmission, and adding fluorite at the same time to adjust slag fluidity; controlling the alkalinity of refining slag to meet the standard requirement; carrying out diffusion deoxidation in the power transmission process, cutting off power after the slag is completely molten, expanding a steel ladle for bottom blowing argon, and controlling the desulfurization efficiency to meet the standard requirement; adding particle steel to increase the oxygen content in the molten steel and improve the fluidity of the molten steel; and adjusting the components of the molten steel to ensure that the components of the molten steel meet the standard requirement, and continuously casting on a crane ladle after the temperature is qualified. According to the technical scheme provided by the invention, after the sulfur content in the molten steel in the refining process reaches the standard requirement, a proper amount of oxidizing material high-quality particle steel is added, so that the fluidity of the molten steel is improved, a pouring nozzle is prevented from being blocked, and pouring in the continuous casting process is smooth.

Description

technical field [0001] The invention relates to the technical field of steel manufacture, in particular to a smelting method for improving the fluidity of molten steel after smelting and desulfurization of threaded steel. 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 for rural farmers, 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 "converter-argon station- LF refining furnace - continuous casting" refining process. [0003] The main raw materials for converter steelmaking are molten iron and steel scrap. After a long-time shutdown of the blast furnace or when the furnace is in poor condition, the composition of the molten iron is prone to fluctuations, especially the ...

Claims

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Application Information

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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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