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A method for producing ultra-low phosphorus steel in double ladle

A technology for ultra-low phosphorus steel and ladle, which is applied in the field of ultra-low phosphorus steel produced by double ladle, can solve the problems of high temperature loss of molten steel, inability to dephosphorize slag, and risk of rephosphorization. The effect of avoiding temperature loss and simple process control

Active Publication Date: 2022-05-13
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The slag removal machine has the following disadvantages: first, the dephosphorization slag cannot be completely removed, and there is a risk of phosphorus return; second, the process of moving the ladle to the slag removal position back and forth, and the agitation during the slag removal cause a great loss of temperature of the molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, the production process route of ultra-low phosphorus steel is: molten iron pretreatment--converter smelting--LF slag washing--ladle double slag removal-LF furnace refining and secondary slagging-continuous casting machine casting. in:

[0037] 1. Hot metal pretreatment:

[0038] The sulfur content of molten iron is 0.0021%.

[0039] 2. Converter smelting:

[0040] Converter adopts single slag method to make slag, P content is 0.0036% when tapping, oxygen content of molten steel is 610ppm, non-killed tapping, 160kg of lime is added to ladle A before tapping, 100kg of lime is added during tapping, argon is blown at the bottom of the ladle , Tapping process slag washing, slag blocking tapping.

[0041] 3. LF slag washing:

[0042] After the molten iron enters the station, add 500kg of lime, add a slag agent, and do not add a deoxidizing alloy to create an alkaline oxidized slag. The molten steel is heated to 1600°C, blown at the bottom with argon g...

Embodiment 2

[0050] In this embodiment, the production process route of ultra-low phosphorus steel is: molten iron pretreatment-converter smelting-LF slag washing-ladle double slag removal-LF furnace refining and secondary slagging-continuous casting machine casting. in:

[0051] 1. Hot metal pretreatment:

[0052] The sulfur content of molten iron is 0.0015%.

[0053] 2. Converter smelting:

[0054] Converter adopts double slag method to make slag. When tapping, the P content is 0.0052%, and the oxygen content of molten steel is 570ppm. Unkilled tapping, 180kg of lime is added to ladle A before tapping, 120kg of lime is added during tapping, and argon is blown at the bottom of the ladle. , Tapping process slag washing, slag blocking tapping.

[0055] 3. LF slag washing:

[0056] After the molten iron enters the station, add 500kg of lime, add a slag agent, and do not add a deoxidizing alloy to create an alkaline oxidized slag. The molten steel is heated to 1620°C, and argon gas is bl...

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Abstract

The invention relates to a method for producing ultra-low phosphorous steel with double ladles. The process route includes molten iron pretreatment, converter smelting, LF slag washing, ladle double slag removal, LF furnace refining, secondary slagging, and molten steel casting; wherein the ladle Double slag removal is as follows: bake ladle B to above 1100°C, add lime; install a long nozzle at the bottom of ladle A, and the molten steel in ladle A flows into ladle B through the long nozzle, and ensure that the molten steel flowing into ladle B does not Contains the top slag in ladle A; add lime to cover the tank during tapping to ladle B. The process of the invention is simple, and the requirements for the phosphorus content in the converter tapping are not high, and the dephosphorization slag is completely removed by the ladle duplex method, and the temperature drop of the molten steel is small; the operation process is simple, the input cost is low, and ultra-low phosphorus can be realized Multi-furnace continuous casting production of steel.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for duplex production of ultra-low phosphorus steel with ladles. Background technique [0002] Phosphorus is a harmful element in steel, which can easily cause segregation at grain boundaries and reduce the plasticity, toughness and weldability of steel. High-grade high-quality steel requires the lower the phosphorus element in the steel, the better. In the traditional production of ultra-low phosphorus steel, the method of top-bottom combined blowing converter double slag or converter double connection method is often used to reduce the phosphorus in the steel. During refining, the slag is used to wash out the phosphorus, and then the dephosphorization slag is removed with a slag remover. The slag removal machine has the following disadvantages: first, the dephosphorization slag cannot be completely removed, and there is a risk of phosphorus return; second, the pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064B22D11/116
CPCC21C7/064C21C7/0037C21C7/0068C21C7/0075B22D11/116C21C2007/0093
Inventor 赵帅李泽林李旭尚世震潘瑞宝李泊李冰洋
Owner ANGANG STEEL CO LTD
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