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Method for reducing bubbles of continuous casting primary blank

A continuous casting and bubble technology is applied in the field of reducing the bubbles of the continuous casting head billet, which can solve the problems of increased production cost, long tundish, uneven baking, etc., and achieve the effects of improving the quality of the casting billet, reducing the bubbles, and reducing the production cost.

Inactive Publication Date: 2018-09-07
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the billet with bubbles is rolled, there are defects on the surface or inside of the product, which cannot meet the user's requirements
Slabs with subcutaneous air bubbles can only be treated as scrap steel, resulting in increased production costs
For example, HBIS Chenggang’s Wire Rod Division uses an eight-machine eight-strand continuous casting machine with a long tundish and uneven baking. Therefore, during the pouring process of the first furnace of continuous casting, the number of heads with air bubbles is large, and the production higher cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: The method for reducing air bubbles in the continuous casting billet adopts the following specific processes.

[0011] (1) Taking the steel HPB300 for wire rod as an example, before the first furnace of continuous casting starts pouring, after the tundish is baked and opened to the working position, silicon-calcium powder is added to the nozzle of the tundish. See Table 1 for the baking temperature of the tundish before continuous casting, the temperature of molten steel and the amount of silicon-calcium powder added to the tundish.

[0012] Table 1: Continuous casting casting parameters

[0013] Tundish baking temperature / ℃

Molten steel temperature / ℃

Molten steel weight / ton

Addition amount of CaSi powder / kg

1131

1607

125

150

[0014] The CaSi powder was sampled and tested, and the test results are shown in Table 2.

[0015] Table 2: CaSi powder main component content (wt)

[0016] ingredient name

Si...

Embodiment 2

[0020] Embodiment 2: The method for reducing air bubbles in the continuous casting billet adopts the following specific processes.

[0021] (1) Taking the steel HPB300 for wire rod as an example, see Table 4 for the baking temperature of the tundish before continuous casting, the temperature of molten steel and the amount of silicon-calcium powder added to the tundish.

[0022] Table 4: Continuous casting casting parameters

[0023] Tundish baking temperature / ℃

Molten steel temperature / ℃

Molten steel weight / ton

Addition amount of CaSi powder / kg

1131

1603

125

200

[0024] The CaSi powder was sampled and tested, and the test results are shown in Table 5.

[0025] Table 5: CaSi powder main component content (wt)

[0026] ingredient name

Si

Ca

Al

C

P

S

Ingredient content / %

55

29

2.3

0.8

0.05

0.04

[0027] (2) The size of the small slab crystallizer, the length of the cast slab, t...

Embodiment 3

[0030] Embodiment 3: The method for reducing air bubbles in the continuous casting billet adopts the following specific processes.

[0031] (1) Taking steel 81MnCrV for wire as an example, see Table 7 for the baking temperature of the tundish before continuous casting, the temperature of molten steel and the amount of silicon-calcium powder added to the tundish.

[0032] Table 7: Continuous casting start-up parameters

[0033] Tundish baking temperature / ℃

Molten steel temperature / ℃

Molten steel weight / ton

Addition amount of CaSi powder / kg

1120

1550

125

180

[0034] The CaSi powder was sampled and tested, and the test results are shown in Table 8.

[0035] Table 8: CaSi powder main component content (wt)

[0036] ingredient name

Si

Ca

Al

C

P

S

Ingredient content / %

59

28

1.9

0.72

0.053

0.035

[0037] (2) The size of the small slab crystallizer, the length of the slab, the count...

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PUM

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Abstract

The invention discloses a method for reducing bubbles of a continuous casting primary blank. Before casting of the continuous casting primary blank, 1.2-1.6 kg of silicon-calcium powder for each ton of steel is added into a tundish nozzle. According to the method, the silicon-calcium powder is added into the tundish nozzle before casting of the first furnace of continuous casting. The silicon-calcium powder reacts with oxygen in molten steel, the oxygen is fixed and discharged, thus appearing of the bubbles of the continuous casting primary blank is reduced, the quality of a casting blank is improved effectively, and production cost is lowered.

Description

technical field [0001] The invention relates to a continuous casting method, in particular to a method for reducing air bubbles in a continuous casting head billet. Background technique [0002] In the process of continuous casting, due to factors such as insufficient deoxidation, high moisture content of the alloy material, and poor baking of the tundish in the first heat of molten steel, air bubbles often appear on the surface or subcutaneous of the first billet. After the billet with bubbles is rolled, there are defects on the surface or inside of the product, which cannot meet the user's requirements. Slabs with subcutaneous air bubbles can only be treated as scrap steel, resulting in increased production costs. For example, HBIS Chenggang’s Wire Rod Division uses an eight-machine eight-strand continuous casting machine with a long tundish and uneven baking. Therefore, during the pouring process of the first furnace of continuous casting, the number of heads with air bu...

Claims

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Application Information

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IPC IPC(8): B22D11/11
Inventor 李亚厚康毅张贺佳方鸣贾元海李亚彦
Owner HEBEI IRON AND STEEL
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