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Technology of improving and stabilizing titanium recorery rate in titanium micro-alloyed high strength weether resistant sinelting and continuous casting process

A technology of microalloying and weathering steel, applied in the field of metallurgy, can solve problems such as poor stability, instability, and large fluctuations in product performance, and achieve the effects of low cost, stable process control, and reduced cost per ton of steel

Inactive Publication Date: 2007-10-31
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When titanium microalloying technology is used in the ladle refining furnace of the traditional thick slab continuous casting and rolling process, the titanium content in the molten steel cannot be accurately controlled during the refining and continuous casting process, so the recovery rate of titanium is very low and unstable, generally at 30 %, resulting in large fluctuations in product performance and poor stability, making it impossible to further promote and apply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Ingredients: crushed material 70t, medium waste 40t, pig iron 50t, the carbon content is 1.38%; the weight percentage of Cu in the refined steel is 0.26%.

[0013] (2) Melting of molten steel (denitrification): In this embodiment, the C / O is controlled as follows through the violent C-O reaction in the smelting process and the furnace door C-O gun manipulator:

[0014] In the early stage of smelting, that is, when the temperature is below 1520°C, C / O=1:2.

[0015] In the middle stage of smelting, that is, when the temperature is between 1520°C and 1580°C, C / O=1:1.

[0016] In the later stage of smelting, that is, when the temperature is above 1580°C, C / O=2:1.

[0017] The carbon oxygen gun should keep its gun head obliquely inserted in the slag, and it should be about 30mm away from the molten pool.

[0018] Finally, the weight percentage of nitrogen in molten steel is 0.0045%.

[0019] (3) Composition control of the foam slag: the composition of the foam slag in...

Embodiment 2

[0028] (1) Ingredients: crushed material 40t, medium waste 45t, pig iron 30t, HBI (hot-pressed sponge iron) 45t, the carbon content is 1.5%; the weight percentage of Cu in the refined steel is 0.29%.

[0029] (2) Melting of molten steel (denitrification): In this embodiment, the C / O is controlled as follows through the violent C-O reaction in the smelting process and the furnace door C-O gun manipulator:

[0030] In the early stage of smelting, that is, when the temperature is below 1520°C, C / O=1:2.

[0031] In the middle stage of smelting, that is, when the temperature is between 1520°C and 1580°C, C / O=1:1.

[0032] In the later stage of smelting, that is, when the temperature is above 1580°C, C / O=2:1.

[0033] The weight percent of nitrogen in molten steel is 0.00581%.

[0034] (3) Composition control of the foam slag: the composition of the foam slag in this embodiment is: CaO: 38%, SiO 2 : 16%, MgO: 8%, MnO: 5%, FeO: 26%, Al 2 o 3 : 5%, P: 0.4%, S: 0.6%, .

[0035] Add...

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Abstract

The invention discloses a improving and stabilizing titanium recovery technique in titanium micro-alloying high intensity weathering steel smelting and continuous casting process. The technique includes the following steps: adopting modern electric furnace to smelt; adjusting the component and adding titanium to do titanium micro-alloying in ladle refining furnace; and adopting protection casting. This can smelt out low carbon titanium micro-alloying high intensity weathering steel molten steel whose carbon content is less than 0.08%. And titanium recover is more than 70%. To adjust titanium percentage by weight can produce yield strength 450MPa-700MPa titanium micro-alloying high intensity weathering steel.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a smelting and continuous casting control process for smelting titanium micro-alloyed high-strength weather-resistant steel with a carbon content below 0.08% and required for hot rolling in an electric furnace-ladle refining furnace. Background technique [0002] High-strength weather-resistant steel plates are important materials for the manufacture of containers, railway freight cars, urban subway cars, bridges and high-speed train cars. In many industrially developed countries abroad, the yield strength of high-strength weathering steel developed and produced by using the traditional thick slab continuous casting and rolling process and other technical means (such as adding Nb, V, Mo, etc.) can reach 500-700Mpa. With the rapid development of my country's economic construction, the demand for high-strength weathering steel continues to increase. At present, the output, stren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21C7/00B22D11/11C22C38/14
Inventor 毛新平林振源李烈军谢利群陈学文许传棻庄汉洲刘义军李金象
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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