Smelting method of low-phosphorous steel

A smelting method and technology for low-phosphorus steel, applied in the field of smelting low-phosphorus steel, can solve the problems of poor dephosphorization slag slag effect, poor dephosphorization slag fluidity, and high phosphorus content, and achieves short smelting time, small iron loss, good fluidity

Active Publication Date: 2015-01-21
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of heavy pollution, poor dephosphorization slag effect, poor fluidity of dephosphorization slag, and high phosphorus content in molten steel in the existing low-phosphorus steel smelting process, and to provide an environmentally friendly and effective dephosphorization process. Phosphorus furnace slag slag effect and dephosphorization slag fluidity, low phosphorus steel production method to reduce phosphorus content in molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment, a 220-ton top-bottom combined blowing converter is used, and the specific operation method is as follows:

[0031] Step S1-2: After adding 20 tons of scrap steel and adding 197 tons of molten iron, the dephosphorized molten steel and dephosphorized slag are obtained by converter blowing and dephosphorization. This embodiment adopts the low grab position control process. At the beginning of blowing, the gun position is 2.2m. After blowing for 1 minute, adjust the gun position to 2.4m, and the oxygen supply flow rate is 42000Nm 3 / h, the composition mass percent of dephosphorization slag is: CaO: 32.615, SiO 2 : 21.728, MnO: 2.523, FeO: 5.238, MgO: 9.660, Fe and trace elements: 28.236. The basicity of the slag in the dephosphorization stage is 1.50.

[0032] Step S2-2: Add 1500kg of bauxite to the converter, and control the amount of Al in the dephosphorization slag 2 o 3 The mass fraction of is 13.25%.

[0033] Step S3-2: 1.5 minutes after adding...

Embodiment 2

[0037] The specific operation steps of the low-phosphorus steel smelting method provided by the present embodiment are as follows:

[0038] Step S1-3: After adding 21 tons of scrap steel and adding 196 tons of molten iron, the dephosphorized molten steel and dephosphorized slag are obtained by converter blowing and dephosphorization. This embodiment adopts the low position control process. At the beginning of blowing, the gun position is 2.2m. After blowing for 1 minute, adjust the gun position to 2.35m, and the oxygen supply flow rate is 42000Nm 3 / h, the composition mass percent of dephosphorization slag is: CaO: 27.922, SiO 2 : 16.354, MnO: 4.237, FeO: 7.980, MgO: 7.384, Fe and trace elements: 36.123. The basicity of the slag in the dephosphorization stage is 1.71.

[0039] Step S2-3: Add 1800 kg of bauxite to the converter, and control the amount of Al in the dephosphorization slag 2 o 3 The mass fraction of is 14.27%.

[0040] Step S3-3: After adding bauxite for 1.8 ...

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Abstract

The invention discloses a smelting method of low-phosphorous steel, which comprises the steps that after melted iron is added to scrap steel, the scrap steel is dephosphorized through converter blowing to obtain dephosphorized liquid steel and dephosphorized slag; bauxite is added to a converter, the adding quantity is 5-15kg every ton of steel, and the mass percentage of Al2O3 in the dephosphorized slag is controlled at 10-15%; 1-2 minutes after the bauxite is added, the dephosphorized slag is discharged from the converter; the dephosphorized liquid steel is dephosphorized through the converter blowing to obtain low-phosphorous liquid steel and decarbonized slag; the converter tapping is conducted; and the decarbonized slag is discharged from the converter. With the adoption of the smelting method of the low-phosphorous steel, the proportion of the discharged slag amount to the total dephosphorized slag amount is equal to or greater than 70% in the converter dephosphorization process; rephosphorization is prevented; in addition, the slag formation raw material is more environmental-friendly without pollution of the environment; and the mass percentage of phosphorus in the finally obtained low-phosphorous liquid steel can be less than 0.0060%.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, in particular to a method for smelting low phosphorus steel. Background technique [0002] Traditional converter smelting adopts the process of "adding scrap steel and molten iron→converter blowing→converter tapping". This method is suitable for smelting steel grades with general quality requirements. With the improvement of the requirements for clean steel, the phosphorus content in steel is required to be below 0.0080%, which increases the difficulty of converter dephosphorization. In order to produce ultra-low phosphorus steel, there are currently two main processes: (1) The process of double slag smelting is adopted, and the slag dumping operation is carried out after the dephosphorization is completed, and a part of the dephosphorization slag is poured out, and then blowing is carried out. However, in order to ensure the dephosphorization effect in the operation, high-positio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/064
CPCY02P10/20
Inventor 朱国森李海波王新华刘锟刘国梁吕延春崔阳王文军姜仁波吕迺冰南晓东张立国尹娜刘柏松
Owner SHOUGANG CORPORATION
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