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A method for deoxidizing and slagging low-carbon aluminum-killed steel

A low-carbon aluminum-killed steel and slag-forming technology, applied in the field of iron and steel smelting, can solve the problems of large total production of molten steel Al2O3, difficult to adapt to CSP continuous casting machines, and inability to perform deep desulfurization, etc., to improve the quality of molten steel and achieve significant economic benefits. , Als content control accurate effect

Active Publication Date: 2021-03-19
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the RH process cannot perform deep desulfurization, and it is difficult to adapt to the CSP continuous casting machine
The Chinese patent "A Production Method for Medium and Low Carbon Aluminum Killed Steel" has the following disadvantages: ①Using aluminum to remove the oxygen in the steel and the oxygen in the slag, the total amount of molten steel Al2O3 is large, and a large amount of calcium wire needs to be fed in the later stage of the LF furnace for calcium processing, high cost

Method used

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  • A method for deoxidizing and slagging low-carbon aluminum-killed steel
  • A method for deoxidizing and slagging low-carbon aluminum-killed steel
  • A method for deoxidizing and slagging low-carbon aluminum-killed steel

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Experimental program
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Effect test

Embodiment 1

[0033] From figure 1 It can be seen that the deoxidation and slagging method of a low-carbon aluminum-killed steel of the present embodiment comprises the following steps:

[0034] Step 1: tap after converter blowing, add carburant 0.3-0.6kg / ton of steel to the ladle before tapping, add carburant 0.3-0.4kg / ton steel in line with the steel flow during the tapping process, and tap After 30 seconds of steel, add lime 2~5kg / ton steel to the ladle, and do not add any aluminum-containing materials during the tapping process. ;

[0035] Step 2: The molten steel is refined in an LF furnace, and 0.5-0.6 kg / ton of carburizer is added to the slag surface, and the carburizer is evenly distributed when adding;

[0036] Step 3: Adjust the flow rate of argon blowing at the bottom of the ladle, and set the flow rate of argon blowing at 400-600NL / min. After blowing out the slag layer, immediately set the flow rate of argon blowing at 200-400NL / min to ensure that the bright surface of molten ...

Embodiment 2

[0055] A deoxidation and slagging method for low-carbon aluminum-killed steel in this embodiment, the steel is tapped after the converter blowing is completed, and 60 kg of recarburizer is added to the ladle before tapping, and 36 kg of recarburizer is added in alignment with the steel flow during tapping , when the steel is tapped for 30 seconds, add 500kg of lime to the ladle; no aluminum-containing material is added during the tapping process;

[0056] After the molten steel enters the LF process, add 60kg of carburizer to the slag surface, and evenly distribute the slag surface when adding;

[0057] Adjust the argon blowing flow rate at the bottom of the ladle, set the argon blowing flow rate to 500NL / min, immediately set the argon blowing flow rate to 300NL / min after blowing out the slag layer, and the bright surface of the molten steel is about 120mm;

[0058] Temperature measurement, molten steel temperature 1565°C, heating for 18 minutes, during the heating period, add...

Embodiment 3

[0067] A deoxidation and slagging method for low-carbon aluminum-killed steel in this embodiment, the steel is tapped after the converter blowing is completed, and 50 kg of recarburizer is added to the ladle before tapping, and 45 kg of recarburizer is added in alignment with the steel flow during tapping , when tapping for 30 seconds, add 360kg of lime to the ladle; no aluminum-containing material is added during the tapping process;

[0068] After the molten steel enters the LF process, add 70kg of recarburizing agent to the slag surface, and evenly distribute the slag surface when adding;

[0069] Adjust the flow rate of argon blowing at the bottom of the ladle, and set the flow rate of argon blowing at 550NL / min. After blowing out the slag layer, immediately set the flow rate of argon blowing at 330NL / min, and the bright surface of molten steel is about 140mm;

[0070] Temperature measurement, molten steel temperature 1555°C, heating for 20 minutes, during the heating peri...

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Abstract

The invention discloses a deoxidation slag making method for low-carbon aluminum killed steel, and belongs to the technical field of steel making. The method comprises the following steps that 1, whenconverter steel tapping is conducted, molten steel is subjected to pre-deoxidation by adding a recarburizer; 2, the molten steel is put into an LF furnace for refining, and the recarburizer is addedinto the top of slag so that deoxidation can be conducted on the furnace slag; 3, the steel ladle bottom argon blowing flow rate is adjusted; 4, after the temperature is measured, heating starts to beconducted; 5, after heating is stopped, temperature measurement and oxygen fixing are conducted, and the molten steel starts to be subjected to deoxidation and reducing slag making; and 6, ferro-aluminium and aluminum particles are added, and after strong stirring is conducted for 5 min, a sample is taken out. According to the deoxidation slag making method, the molten steel is subjected to pre-deoxidation by adding the recarburizer during tapping and subjected to deep deoxidation and alloying through ferro-aluminium during LF furnace refining, reducing slag is made through the recarburizer,the aluminum particles and refined slag, the advantages that the slag making speed is high, the slag making cost is low, the nitrogen content of the molten steel is low, and the cleaniness of the molten steel is high are achieved, in addition, the quality of molten low-carbon aluminum killed steel can be improved, and the remarkable economic benefits are realized.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a deoxidation and slagging method for low-carbon aluminum-killed steel. Background technique [0002] Low-carbon aluminum-killed steel (C: 0.03-0.06%, Al: 0.02-0.07%, Si≤0.03%) is a typical steel grade for cold-rolled thin plates, and is widely used in automobiles, home appliances and construction industries. At present, mainstream steel mills at home and abroad generally adopt four process paths for production: (1) "Molten Iron Pretreatment → Top-bottom Combined Blowing Converter → CAS-OB → Continuous Casting"; (2) "Molten Iron Pretreatment → Top-bottom Combined Blowing Converter → Argon blowing station → continuous casting"; (3) "Molten iron pretreatment → top and bottom double blowing converter → RH → continuous casting"; (4) "Molten iron pretreatment → top and bottom double blowing converter → LF → continuous casting". When the continuous casting machine is C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/00C22C33/06C22C38/02C22C38/04C22C38/06
CPCC21C7/0006C21C7/0056C21C7/0087C21C7/06C22C33/06C22C38/02C22C38/04C22C38/06
Inventor 李应江邓勇李宝庆解养国单永刚胡晓光张雷谢大为熊华报赵梦华
Owner MAANSHAN IRON & STEEL CO LTD