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Dephosphorizing method of vacuum induction furnace

A vacuum induction furnace, vacuum furnace technology, applied in the direction of furnace, electric furnace, furnace type, etc., can solve the problems of insufficient phosphorus content, dust accumulation, furnace lining erosion, etc., achieve obvious dephosphorization effect, increase contact area, and light furnace lining erosion Effect

Inactive Publication Date: 2015-03-18
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, because the phosphorus content in industrial pure iron and other raw materials is not low enough, when smelting high-purity steel and ultra-low phosphorus steel in a vacuum induction furnace, there is no good way to reduce the phosphorus content in steel
The traditional dephosphorization method is to add lime and other slag-forming materials on the surface of molten steel and use slag-gold equilibrium reaction to dephosphorize. This dephosphorization method takes a long time, causes serious corrosion of the furnace lining, and its dephosphorization effect is not obvious. The dephosphorization result usually can only reach Moreover, during the dephosphorization process, lime is easily scattered on the top of the crucible, causing dust to accumulate and causing power outages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Raw materials: The main components of industrial pure iron are shown in Table 1-1, and the main components of limestone and fluorite are shown in Table 1-2;

[0023] Table 1-1

[0024] the element

C

mn

S

P

Al

O

Content (%)

0.004

0.033

0.0028

0.0065

0.0083

0.014

[0025] Table 1-2

[0026] raw material

CaO

CaF 2

SiO 2

S

P

Lime (%)

95.4

2.2

0.012

0.002

Fluorite (%)

87.3

7.1

0.002

0.002

[0027] For the industrial pure iron of the above-mentioned table 1-1 components, adopt the limestone and fluorite of the table 1-2 components to carry out vacuum induction furnace dephosphorization in a 50kg vacuum induction furnace, and the specific steps are as follows:

[0028] 1) Use a baking oven to bake limestone and fluorite at 150°C for 30 minutes;

[0029] 2) Put 400g of limestone and 100g of fluorite into on...

Embodiment 2

[0040] Raw materials: The main components of industrial pure iron are shown in Table 2-1, and the main components of limestone and fluorite are shown in Table 2-2.

[0041] table 2-1

[0042] the element

C

mn

S

P

Al

O

Content (%)

0.007

0.023

0.0028

0.0065

0.013

0.010

[0043] Table 2-2

[0044] raw material

CaO

CaF 2

SiO 2

S

P

Lime (%)

92.2

3.2

0.012

0.002

Fluorite (%)

87.3

7.7

0.002

0.002

[0045] For the industrial pure iron of the above-mentioned Table 2-1 composition, use the limestone and fluorite of the Table 2-2 composition to carry out vacuum induction furnace dephosphorization in a 50kg vacuum induction furnace, and the specific steps are as follows:

[0046] 1) Use a baking oven to bake lime and fluorite at 200°C for 20 minutes;

[0047] 2) Put 450g of baked block lime and 100g of fluorite into t...

Embodiment 3

[0058] Raw materials: The main components of industrial pure iron are shown in Table 3-1, and the main components of limestone and fluorite are shown in Table 3-2.

[0059] Table 3-1

[0060] the element

C

mn

S

P

Al

O

Content (%)

0.005

0.032

0.0026

0.0067

0.0082

0.016

[0061] Table 3-2

[0062] raw material

CaO

CaF 2

SiO 2

S

P

Lime (%)

94.2

3.6

0.011

0.002

Fluorite (%)

86.8

6.2

0.002

0.002

[0063] For the industrial pure iron with the components in Table 3-1 above, use the limestone and fluorite with the components in Table 3-2 to dephosphorize in a vacuum induction furnace using a 50kg vacuum induction furnace. The specific steps are as follows:

[0064] 1) Bake limestone and fluorite with a diameter of 5-10mm in a baking oven at 180°C for 35 minutes;

[0065] 2) Put 412g of limestone and 103g of fluorite...

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Abstract

The invention discloses a dephosphorizing method of a vacuum induction furnace, which sequentially comprises the following steps of: 1) bake limestone and fluorite with a baking furnace, 2) placing the limestone and the fluorite on one side of the bottom of a crucible, 3) placing ingot iron into the crucible, 4) vacuumizing the vacuum furnace, heating the crucible, and continuing to vacuumize after molten steel is molten completely and uniformly, 5) stopping vacuumizing when a vacuum degree reaches 0.6-0.8pa, and filling the vacuum furnace with argon to 0.3-0.7atm, 6) opening the vacuum furnace, and slagging off quickly, 7) closing the vacuum furnace, vacuumizing again, and filling the vacuum furnace with the argon to 0.3-0.7atm when the vacuum degree is below 0.078pa, and 8) adding various alloys into the molten steel for alloying treatment, and tapping after the treatment. Practice shows that the method is simple to operate, good in dephosphorizing effect, and short in reaction time, slag and metal are balanced, and a furnace lining eroded lightly.

Description

technical field [0001] The invention belongs to the technical field of low-phosphorus steel smelting, and specifically refers to a vacuum induction furnace dephosphorization method. Background technique [0002] At present, because the phosphorus content in raw materials such as industrial pure iron is not low enough, when smelting high-purity steel and ultra-low phosphorus steel in a vacuum induction furnace, there is no good way to reduce the phosphorus content in steel. The traditional dephosphorization method is to add lime and other slag-forming materials on the surface of molten steel and use slag-gold equilibrium reaction to dephosphorize. This dephosphorization method takes a long time, causes serious corrosion of the furnace lining, and its dephosphorization effect is not obvious. The dephosphorization result usually can only reach Moreover, during the dephosphorization process, lime is easily scattered on the top of the crucible, causing dust to accumulate and caus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C7/10C21C5/52
Inventor 孙伟曹同友区铁韩斌杨治争朱万军彭著刚陈俊孚杨成威齐江华
Owner 武汉钢铁有限公司
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