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Ladle slag modifier for stainless steel refining process

A technology of refining process and modifying agent, which is applied in the field of steelmaking process, can solve the problems of unsatisfactory clean stainless steel, etc., and achieve the effects of low melting point, improved cleanliness and good fluidity

Active Publication Date: 2012-12-12
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the general stainless steel smelting process, the molten steel enters the LF treatment after AOD tapping, but the alkalinity of the ladle slag is properly controlled by using lime and other slagging agents, which is far from meeting the needs of clean stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The ladle slag modifiers used in the stainless steel refining process of four compositions were tested respectively, and their compositions and application effects are shown in Table 2.

[0025] It can be seen from the table that the use of ladle slag modifier for stainless steel refining process can significantly improve the cleanliness of stainless steel and reduce the total oxygen content of stainless steel.

[0026] Table 1 Unit: weight percentage

[0027] Element

Example 1

Example 2

Example 3

Example 4

CaO

38.0

46.1

42.6

50.0

SiO 2

22.0

24.9

23.7

28.0

al 2 o 3

10.0

5.9

7.6

5.0

CaF 2

10.0

6.3

7.1

5.0

MgO

5.0

3.6

4.2

2.0

B 2 o 3

6.0

6.7

7.5

6.0

Ca-Si

8.0

5.6

6.3

3.0

other

margin

margin

margin

ma...

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PUM

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Abstract

The invention relates to a ladle slag modifier for the stainless steel refining process, which comprises the following components in percentage by weight: 38 to 50 percent of CaO, 22 to 28 percent of SiO2, 5 to 10 percent of Al2O3, 5 to 10 percent of CaF2, 3 to 8 percent of Ca-Si, 2 to 5 percent of MgO and 5 to 10 percent of B2O3, wherein the particle size of the modifier is 3 to 15mm. The ladle slag modifier for the stainless steel refining process modifies and reduces ladle slag subjected to argon oxygen decarburization (AOD) tapping in the stainless steel smelting process to control the alkalinity and reduce the oxidability of the ladle slag, so that the ladle slag has the function of improving the cleanliness of stainless steel, and the quality of the stainless steel is further improved.

Description

technical field [0001] The invention relates to a steelmaking process, in particular to a ladle slag modifier used in a stainless steel refining process. Background technique [0002] Stainless steel smelting generally adopts the two-step process of electric furnace-AOD argon oxygen refining furnace and the three-step process of electric furnace-AOD argon oxygen refining furnace-VOD. After the molten steel is refined by AOD, reduction treatment is used to reduce the chromium oxide in the slag and increase the yield of chromium. Due to the needs of production rhythm and the requirement of further improvement of the cleanliness of molten steel, stainless steel molten steel will be heated in LF ladle furnace before pouring, finely adjust the composition of molten steel, and promote the floating of inclusions, etc., which puts forward strict requirements for ladle slag. After AOD refining, the ladle slag should be removed, but it is difficult to completely remove the ladle slag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 黄宗泽池和冰顾学红胡汉涛
Owner BAOSHAN IRON & STEEL CO LTD
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