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Low-cost arc furnace tapping deoxidization technique

An electric arc furnace, low-cost technology, applied in the field of electric arc furnace clean steel production, can solve the problems of unsatisfactory use effect, inconvenient storage of calcium carbide, stimulating peculiar smell, etc., and achieve the effect of reducing the deoxidation cost of tapping

Inactive Publication Date: 2008-04-09
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Initially, Zhugang tried calcium carbide deoxidation, but the storage of calcium carbide was inconvenient, it had a strong pungent odor, and the effect of use was not satisfactory.
Later, I tried to use lower-cost graphite powder slag surface deoxidation in the refining furnace, and used it in electric furnace tapping. It has a certain deoxidation effect, but it is prone to high-carbon quality accidents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Process flow: 150t ultra-high electric furnace smelting, 150t ladle furnace refining;

[0014] Target steel type: SPA-H (Zhu Steel Code)

[0015] The main chemical composition range of steel is: C: 0.04~0.06.%, Si: 0.32~0.39%, S≤0.010%;

[0016] Requirements for process parameters at the end of the electric furnace: 1630°C ≤ tapping temperature of electric furnace ≤ 1650°C, 900ppm ≤ tapping and fixed oxygen;

[0017] The end point parameters of the electric furnace in this embodiment: temperature 1635°C, fixed oxygen 1190ppm;

[0018] Tapping deoxidation operation:

[0019] 1. Add 60Kg small bag of carbon powder to the bottom of the ladle;

[0020] 2. When the steel reaches 50 tons, add: lime 1500kg, ferromanganese 500kg;

[0021] 3. Add 40Kg small bags of toner in turn;

[0022] 4. When the steel reaches 120 tons, add: 90kg of ferrosilicon (first weighed and placed in the lower part), 300kg of aluminum block, and 500kg of synthetic slag;

[0023] 5. To the end of...

Embodiment 2

[0028] Process flow: 150t ultra-high electric furnace smelting, 150t ladle furnace refining;

[0029] Target steel type: ZJ330B (Zhu Steel Code)

[0030] The main chemical composition range of steel is: C: 0.03~0.07.%, Si: 0.32~0.39%, S≤0.010%;

[0031] Requirements for process parameters at the end of the electric furnace: 1620°C ≤ tapping temperature of the electric furnace ≤ 1650°C,

[0032] 800ppm≤Tapping oxygen;

[0033] The end point parameters of the electric furnace in this embodiment: temperature 1630°C, fixed oxygen 1100ppm;

[0034] Tapping deoxidation operation:

[0035] 1. Add 90Kg small bag of carbon powder to the bottom of the ladle;

[0036] 2. When the steel reaches 80 tons, add: lime 1000kg, ferrosilicon 80kg;

[0037] 3. Add 20Kg small bags of toner one by one;

[0038] 4. When the steel reaches 120 tons, add: 250kg of aluminum block, 500kg of synthetic slag;

[0039] 5. To the end of tapping.

[0040] Molten steel condition after tapping:

[0041] ...

Embodiment 3

[0044] Process flow: 150t ultra-high electric furnace smelting, 150t ladle furnace refining;

[0045] Target steel type: ZJ330B (Zhu Steel Code)

[0046] The main chemical composition range of steel is: C: 0.03~0.07.%, Si: 0.32~0.39%, S≤0.010%;

[0047] Requirements for process parameters at the end of the electric furnace: 1620°C ≤ tapping temperature of electric furnace ≤ 1650°C, 800ppm ≤ tapping and fixed oxygen;

[0048] The end point parameters of the electric furnace in this embodiment: temperature 1645°C, fixed oxygen 1400ppm;

[0049] Tapping deoxidation operation:

[0050] 1. Add 90Kg small bag of carbon powder to the bottom of the ladle;

[0051] 2. When the steel reaches 80 tons, add: lime 1000kg, ferrosilicon 80kg;

[0052] 3. Add 80Kg small bags of toner in turn;

[0053] 4. When the steel reaches 120 tons, add: 250kg of aluminum block, 500kg of synthetic slag;

[0054] 5. To the end of tapping.

[0055] Molten steel condition after tapping:

[0056] ...

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Abstract

The invention discloses a low-cost tapping deoxidizing technique of an electric-arc furnace, which is characterized in that the low-cost carbon power is used for predeoxidizing in the prophase of tapping, the cheap ferrosilicon is used for shallow-deoxidizing in the metaphase of tapping, the aluminum block with strong deoxidizing ability is used for deep-deoxidizing in the anaphase of tapping, thereby the molten steel becomes to the aluminum killed steel finally, the oxygen activity of the molten steel is controlled to the control range of the clean steel. The invention has the technical proposal that: (1) by optimizing the operating process of tapping deoxidizing, the deoxidization is controlled, the acieration is eliminated and the air-breathing is lessened, (2) the low-cost carbon power and ferrosilicon substituting for part of expensive aluminum are used for controlling the tapping deoxidizing , the cost of tapping deoxidizing of electric-arc furnace is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of electric arc furnace clean steel production, in particular to a production process for reducing deoxidation cost and optimizing deoxidation process by tapping steel from an electric arc furnace. Background technique [0002] Modern metallurgical technology has entered the high-tech stage, and clean steel has higher and higher requirements for molten steel: ∑T.O+[S]+[P]+[N]+[H]<100PPM, and the oxygen in molten steel Content puts forward high demands. Therefore, how to reduce the oxygen activity in molten steel at low cost is a key metallurgical technology. At present, the main deoxidation technologies for electric arc furnace tapping at home and abroad mainly include all-aluminum deoxidation, silicon-aluminum deoxidation, silicon-aluminum-barium-calcium deoxidation, etc. The main disadvantage of these deoxidation methods is the high cost of deoxidation. [0003] Guangzhou Zhujiang Iron and Steel Co.,...

Claims

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Application Information

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IPC IPC(8): C21C7/06
Inventor 陈贵浩钟志永杨龙
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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