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Method for smelting low phosphorus and sulfur steel with desulfurization and desiliconization of hot metal ladle and less converter slag

A technology for smelting with less slag and molten iron is applied in the fields of desulfurization and desilication of molten iron and smelting low-phosphorus-sulfur steel with less slag in a converter, which can solve the problems of long processing period, large iron loss and high cost investment, and achieves improved dephosphorization rate, The effect of improving the technical and economic indicators of steelmaking

Active Publication Date: 2019-03-15
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] The purpose of the present invention is to provide a method for desulfurization and desiliconization of molten iron tank and smelting low-phosphorus-sulfur steel with less slag in converter, which overcomes the problems of long processing period, large iron loss and high cost input due to complicated process

Method used

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  • Method for smelting low phosphorus and sulfur steel with desulfurization and desiliconization of hot metal ladle and less converter slag
  • Method for smelting low phosphorus and sulfur steel with desulfurization and desiliconization of hot metal ladle and less converter slag
  • Method for smelting low phosphorus and sulfur steel with desulfurization and desiliconization of hot metal ladle and less converter slag

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Experimental program
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Effect test

Embodiment 1

[0077] This embodiment is carried out in the molten iron KR treatment station and converter, the molten iron is desulfurized and desiliconized in the molten iron tank, and decarburized, deep desiliconized and dephosphorized in the converter.

[0078] The parameters of the main equipment and raw materials of the KR processing station are as follows:

[0079] Inner height of molten iron treatment tank: 4120mm Diameter of bag mouth: 3100mm.

[0080] KR paddle paddle center column diameter: 500mm paddle length: 1050mm width: 830mm thickness: 370mm

[0081] The composition of molten iron is shown in Table 11

[0082] Table 11

[0083] C / ％

Si / %

Mn / %

P / ％

S / ％

temperature / ℃

Weight / t

Slag volume / t

4.20

0.45

0.25

0.130

0.045

1390℃

130

2.5

[0084] The composition of lime powder is shown in Table 12

[0085] Table 12

[0086] CaO / %

SiO 2 / %

MgO / %

P / ％

S / ％

Granularity / mesh

Moisture / %

...

Embodiment 2

[0114] The equipment and raw material parameters of the present embodiment and the KR described in embodiment 1 and the converter are the same.

[0115] The initial conditions of molten iron are shown in Table 18.

[0116] Table 18

[0117] C / ％

Si / %

Mn / %

P / ％

S / ％

temperature / ℃

Weight / t

Slag volume / t

4.50

0.42

0.23

0.131

0.053

1402℃

137

2.3

[0118] The process route of molten iron smelting into molten steel is: blast furnace molten iron—hot metal tank—a small amount of slag removal—KR desiliconization—slag removal—KR desulfurization—slag removal—adding scrap into converter—mixing low-silicon molten iron into converter—top-bottom blowing and decarburization Desiliconization and dephosphorization - converter tapping - ladle - continuous casting.

[0119] Process step 1: desiliconization of molten iron by KR method in the molten iron tank.

[0120] After the molten iron tank is opened to the KR treatment position...

Embodiment 3

[0127] The equipment and raw material parameters of the present embodiment and the KR described in embodiment 1 and the converter are the same.

[0128] The initial conditions of molten iron are shown in Table 18.

[0129] Table 18

[0130] C / ％

Si / %

Mn / %

P / ％

S / ％

temperature / ℃

Weight / t

Slag volume / t

4.45

0.44

0.25

0.129

0.051

1410℃

135

2.1

[0131] The process route of molten iron smelting into molten steel is: blast furnace molten iron—hot metal tank—slag removal—KR desulfurization—slag removal—KR desiliconization—slag removal—adding scrap steel into converter—mixing low-silicon molten iron into converter—top-bottom blowing and decarburization Silicon dephosphorization - converter tapping - ladle - RH - continuous casting.

[0132] Process step 1: Desulfurization of molten iron by KR method in the molten iron tank.

[0133] Open the molten iron tank containing 135t of blast furnace molten iron to the KR treat...

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Abstract

The invention relates to a method for smelting a low phosphorus and sulfur steel with desulfurization and desiliconization of a hot metal ladle and less converter slag, belonging to the technical field of steel making. The method comprises the process steps: the hot metal pretreatment desulfurization is carried out in the hot metal ladle by KR method, and sulfur in the hot metal is removed to 0.002% or below in the hot metal ladle; the hot metal pretreatment desiliconization is carried out in the hot metal ladle by the KR method, and the silicon in the hot metal is removed to 0.20%-0.40%, at the end, the temperature of the hot metal is controlled to be 1250 DEG C or above and then the ladle is removed out; the low-silicon hot metal after desulfurization and desiliconization is put into a converter for decarburization, desiliconization and dephosphorization, and the low-silicon hot metal is exchanged into the converter for decarburization, desiliconization and dephosphorization, and thetop-bottom double-blowing process of top blowing oxygen and bottom blowing argon is used for smelting. At the end of smelting, the weight percentage of C in molten steel is 0.05% to 0.30%, and the end point [P]+[S] is smaller than or equal to 200ppm, the converter is subjected to tapping, the molten steel is discharged into a ladle directly for continuous casting or pouring after RH refining. Theadvantage is that compared with the prior art, the process flow is short, the total amount of phosphorus and sulfur at the end of the molten steel is low, and the total amount of slag is small.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for desulfurizing and desiliconizing molten iron tanks and smelting low-phosphorus-sulfur steel with less slag in a converter, which can reduce the total content of phosphorus and sulfur in treated molten steel to below 0.020%. Background technique [0002] Generally, the traditional process of producing low-phosphorus-sulfur steel from molten steel is molten iron powder spraying desulfurization-converter smelting (dephosphorization)-LF (or RH). After the converter is tapped, the content of phosphorus + sulfur in molten steel is generally 0.030%. Above, the sulfur content is above 0.020%, which must be desulfurized by LF or RH refining to meet the low-sulfur steel standard with sulfur less than 0.005%. However, dephosphorization is carried out simultaneously with decarburization in conventional converters, and it is difficult to stably ensure that phospho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21C1/04C21C5/35C21C7/064C21C7/04
CPCC21C1/02C21C1/04C21C5/35C21C7/04C21C7/064Y02P10/20
Inventor 倪冰杨勇杨利彬贺庆姚同路孟华栋
Owner CENT IRON & STEEL RES INST
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