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Vacuum oxygen blowing decarbon refining furnace smelting stainless steel high carbon region denitrogen method

A vacuum oxygen blowing decarburization and refining furnace technology, applied in the field of stainless steel denitrification in vacuum oxygen blowing decarburization refining furnace, can solve the problems of high cost, complicated process, equipment damage, etc., and achieve light spatter, simple process, and damage small effect

Active Publication Date: 2006-05-24
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the existing vacuum oxygen-blowing decarburization refining furnace smelting stainless steel denitrification method for serious equipment damage, complicated process and high cost, the present invention provides a vacuum oxygen-blowing decarburization refining furnace smelting stainless steel denitrification method, the denitrification The method is simple and the splash is slight

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The requirements for smelting raw materials and smelting furnaces are as follows:

[0023] The double-station platform type vacuum oxygen blowing decarburization refining furnace is adopted. The volume of the furnace is 75t, and the distance from the free space, that is, the slag liquid level to the upper edge of the ladle wall, is 1250mm. Smelted stainless steel: 00Cr12Ti.

[0024] The actual thickness of molten steel slag is 20mm. The molten steel weighs 75.1 tons.

[0025] C％

Si%

Mn%

P％

S％

Cr％

Ni%

Nppm

0.32

0.13

0.18

0.024

0.003

10.82

0.05

230

[0026] The temperature of molten steel before treatment was 1605°C.

[0027] The steps of this embodiment are as follows:

[0028] Time Processing content

[0029] 8:16 The stainless steel molten steel is poured into the ladle of the vacuum oxygen blowing decarburization refining furnace before treatment, and the workin...

Embodiment 2

[0044] The requirements for smelting raw materials and smelting furnaces are as follows:

[0045] The double-station platform type vacuum oxygen blowing decarburization refining furnace is adopted. The volume of the furnace is 75t, and the distance from the free space, that is, the slag liquid level to the upper edge of the ladle wall, is 1250mm.

[0046] The actual thickness of molten steel slag is 28mm.

[0047] The molten steel weighs 73.6 tons.

[0048] Smelted stainless steel: 0Cr18Ni9.

[0049] C％

Si%

Mn%

P％

S％

Cr％

Ni%

Nppm

0.34

0.11

1.21

0.016

0.005

17.36

8.11

376

[0050] The temperature of molten steel before treatment was 1593°C.

[0051] The steps of this embodiment are as follows:

[0052]Time Processing content

[0053] 00:58 The stainless steel molten steel is poured into the ladle of the vacuum oxygen blowing decarburization refining furnace before treatme...

Embodiment 3

[0066] The requirements for smelting raw materials and smelting furnaces are as follows:

[0067] The double-station platform type vacuum oxygen blowing decarburization refining furnace is adopted. The volume of the furnace is 75t, and the distance from the free space, that is, the slag liquid level to the upper edge of the ladle wall, is 1250mm.

[0068] The actual thickness of molten steel slag is 24mm.

[0069] The molten steel weighs 71.8 tons.

[0070] Smelted stainless steel: 0Cr17.

[0071] Chemical composition of molten steel before treatment:

[0072] C％

Si%

Mn%

P％

S％

Cr％

Ni%

Nppm

0.38

0.10

0.24

0.020

0.008

17.01

0.02

359

[0073] The temperature of molten steel before treatment was 1599°C.

[0074] The steps of this embodiment are as follows:

[0075] Time Processing content

[0076] 09:45 Before the treatment, the stainless steel molten steel is poured into t...

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Abstract

A method for denitrifying stainless steel in a high-carbon area in a vacuum oxygen-blowing decarburization refining furnace, the method comprising: pouring stainless steel water with a carbon content ≥ 0.30% into a vacuum oxygen-blowing decarburization refining furnace, vacuuming and blowing in argon, When the vacuum in the furnace reaches 150-200Torr, blow oxygen into the furnace; then stop blowing oxygen in the desiliconization, turn on the bottom argon blowing to the maximum, the pressure in the furnace drops to ≤5Torr, boil for more than 8 minutes, and denitrify by boiling; then continue Oxygen blowing decarburization, increase the vacuum degree, when the decarburization reaches the requirement, the vacuum degree is 20-40Torr; stop oxygen blowing, pump the vacuum degree in the furnace below 5Torr, blow in argon gas again, make the molten steel boil for more than 8 minutes for deoxidation Decarburization; Boiling is over, the vacuum is below 10 Torr, the bottom blowing argon is turned on to the maximum, reducing materials are added for reduction, and the vacuum is kept for more than 10 minutes; after that, stop blowing argon and blow in nitrogen to break the vacuum. The method reduces the nitrogen content in the molten steel to below 100ppm, and the damage to the equipment of the vacuum blowing oxygen decarburization refining furnace is small.

Description

technical field [0001] The invention relates to a method for denitrification of stainless steel smelted in a vacuum oxygen blowing decarburization refining furnace, that is, a method for denitrification of stainless steel smelted by vacuum oxygen blowing decarburization. Background technique [0002] Nitrogen is a harmful element in titanium-containing stainless steel and ferritic stainless steel, so in the smelting process of titanium-containing stainless steel and ferritic stainless steel, the lower the nitrogen content, the better, and nitrogen has a large solubility in stainless steel, and nitrogen is Large atomic elements are difficult to remove. [0003] After the invention of the vacuum oxygen blowing decarburization refining furnace smelting method, in the actual use of smelting stainless steel, the deep denitrification effect of the traditional vacuum oxygen blowing decarburization refining furnace is poor, and it is difficult to denitrify below 100ppm. In order to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/072C21C7/10
Inventor 刘承志王立新刘春来夏焱张霞徐芳泓李志斌李建明李道明
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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