A method for smelting titanium-containing ferritic stainless steel

A smelting method and stainless steel technology are applied in the production field of titanium-containing ferritic stainless steel, which can solve the problems of affecting product quality, easy deposition of nozzles, and increasing the formation of core-containing TiN, so as to suppress harmful inclusions of magnesium-aluminum spinel. Form, ensure smooth progress, and improve the effect of product quality

Active Publication Date: 2016-01-20
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the deoxidation process of stainless steel, aluminum deoxidation is generally used, but a large amount of MgO·Al will be formed 2 o 3 Inclusions, such inclusions have high melting point and high hardness, are easy to deposit inside the submerged nozzle and cause nozzle blockage
In addition, a large amount of MgO·Al is formed in the steel 2 o 3 Inclusions will increase the formation of cored TiN and affect the quality of the final product

Method used

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  • A method for smelting titanium-containing ferritic stainless steel
  • A method for smelting titanium-containing ferritic stainless steel
  • A method for smelting titanium-containing ferritic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for smelting titanium-containing ferritic stainless steel, comprising the following steps:

[0024] 1. Dephosphorization treatment of molten iron in dephosphorization converter

[0025] The molten iron is mixed into the dephosphorization converter from the ordinary molten iron tank, and the dephosphorization treatment is carried out by the injection method, and the flow rate of the top blowing oxygen lance is 70Nm during the treatment process 3 / min, the gun position is 1.7m, add slagging material and dephosphorizing agent after 2min, the amount of slagging material added is 25.0kg / t per ton of molten iron, the amount of dephosphorizing agent added is 20.0kg / t per ton of molten iron, treatment In the process, the slag basicity is controlled at 2.0; the percentage by weight of the composition of the treated molten iron is:

[0026] C: 2.8%, Mn: 0.20%, P: 0.015%, S: 0.05%, the rest is Fe and unavoidable impurities, the temperature is 1380°C;

[0027] 2. The mol...

Embodiment 2

[0055] A method for smelting titanium-containing ferritic stainless steel, comprising the following steps:

[0056] 1. Dephosphorization treatment of molten iron in dephosphorization converter

[0057] The molten iron is mixed into the dephosphorization converter from the ordinary molten iron tank, and the dephosphorization treatment is carried out by spraying. Phosphorus agent, the amount of slagging material added is 30.0kg / t per ton of molten iron, the amount of dephosphorization agent added is 25.0kg / t per ton of molten iron, and the slag alkalinity is controlled at 2.5 during the treatment process; the weight percentage of the composition of the molten iron after treatment is :

[0058] C: 3.5%, Mn: 0.21%, P: 0.02%, S: 0.042%, the rest is Fe and unavoidable impurities, the temperature is 1460°C;

[0059] 2. The molten steel is decarburized, denitrified and reduced in the AOD converter

[0060] 96.8t of molten iron is injected into the AOD converter, and oxygen is blown...

Embodiment 3

[0087] A method for smelting titanium-containing ferritic stainless steel, comprising the following steps:

[0088] 1. Dephosphorization treatment of molten iron in dephosphorization converter

[0089] The molten iron is mixed from the ordinary molten iron tank into the dephosphorization converter, and the dephosphorization treatment is carried out by the injection method. During the treatment process, the flow rate of the top blowing oxygen lance is 100Nm 3 / min, the gun position is 1.6m, add slagging material and dephosphorization agent 2min after the start, the amount of slagging material added is 26.0kg / t per ton of molten iron, the amount of dephosphorizing agent added is 23.0kg / t per ton of molten iron, treatment In the process, the slag basicity is controlled at 2.2; the percentage by weight of the composition of the treated molten iron is:

[0090] C: 3.0%, Mn: 0.25%, P: 0.017%, S: 0.040%, the rest is Fe and unavoidable impurities, the temperature is 1470°C;

[0091]...

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Abstract

The invention discloses a titanium-containing ferritic stainless steel smelting method. The titanium-containing ferritic stainless steel smelting method comprises the following steps: (1) carrying out phosphorous removal treatment on molten iron in a phosphorous removal converter; (2) carrying decarburization, denitrification and reduction treatment on molten steel in an AOD (Argon Oxygen Decarburization) converter; (3) tapping the molten steel to a steel ladle; (4) moving the steel ladle to a LF furnace, and then weakly blowing argon; (5) carrying out calcium treatment on a silicon-calcium feeding line; (6) hoisting the steel ladle to a slagging station so as to slag furnace clinker; (7) moving the steel ladle to the LF furnace again so as to carry out titanium alloying; (8) slagging again in the LF furnace; (9) slugging, and heating; (10) carrying out argon blowing treatment in the LF furnace; (11) confirming components and temperature; (12) weakly blowing the LE furnace, and moving out of the LF furnace; and (13) carrying out continuous casting. The titanium-containing ferritic stainless steel smelting method has the advantages that the content of C and N can be controlled at a relatively low level under the condition that vacuum treatment equipment is not provided, meanwhile, the formation of harmful occluded foreign substances such as magnesium and aluminum in the production process is prevented or inhibited, the product quality is improved, the blockage of tundish water gaps is prevented in a continuous casting process, and the smooth production is ensured.

Description

technical field [0001] The invention belongs to the technical field of stainless steel smelting, and in particular relates to a production method of titanium-containing ferritic stainless steel. Background technique [0002] At present, ferritic stainless steel, which is less dependent on nickel resources, has been paid more and more attention by the society. The interstitial elements carbon and nitrogen in ferritic stainless steel seriously affect its performance. In material design, its performance can be improved by adding Ti element. Titanium can improve the stability of interstitial elements C and N. The reaction of Ti and C to generate TiC inhibits the formation of CrC at the grain boundary and prevents the depletion of Cr at the grain boundary. The reaction of Ti and N generates TiN as the nucleation core to increase the equiaxed crystal rate. Titanium can also improve the oxidation resistance and thermal fatigue resistance of ferritic stainless steel. However, Ti h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C22C33/04
Inventor 陈兴润王建新陈得贵田书武白小军
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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