Low-cost slab Q235B steelmaking technology

A low-cost, slab technology, applied in the field of steelmaking, can solve problems such as increasing steelmaking costs

Inactive Publication Date: 2021-07-06
福建三宝钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the existing technology, the present invention provides a low-cost slab Q235B steelmaking process, which solves the problem that the deoxidizer used in the current slab Q235B steelmaking greatly increases the cost of steelmaking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A low-cost slab Q235B steelmaking process, comprising the following steps:

[0035] Step 1. Prepare molten iron and scrap steel. Control the temperature of the molten iron to 1250°C and the slag content to 0.3%. Then add the molten iron into the converter, preheat the scrap steel to 500°C and put it into the converter for smelting;

[0036]Step 2: Blow oxygen into the lowering gun, add slag to the converter, control the gun position to 1.2m, the oxygen pressure to 0.8MPa, and the flow rate to 17000m 3 / h, after 3 minutes of treatment, carry out the pressure gun to pull carbon treatment, lower the gun position to 1.0m, control the oxygen pressure and flow rate to remain unchanged, continue the treatment for 50 seconds, lift the gun and stop blowing in oxygen;

[0037] Step 3: Use compound deoxidizer to carry out deoxidation treatment at the end of converter smelting, and at the same time blow argon gas into the converter for 4 minutes, use the sliding plate slag blocking...

Embodiment 2

[0056] A low-cost slab Q235B steelmaking process, comprising the following steps:

[0057] Step 1. Prepare molten iron and steel scrap. Control the temperature of the molten iron to 1500°C and the slag content to 0.5%, then add the molten iron to the converter, preheat the scrap to 600°C and put it into the converter for smelting;

[0058] Step 2: Blow oxygen into the lowering gun, add slag to the converter, control the gun position to 1.2m, the oxygen pressure to 0.8MPa, and the flow rate to 17000m 3 / h, after 5 minutes of treatment, carry out the carbon gun treatment, lower the gun position to 1.0m, control the oxygen pressure and flow rate, continue the treatment for 50 seconds, lift the gun and stop blowing in oxygen;

[0059] Step 3: Use compound deoxidizer to carry out deoxidation treatment at the end of converter smelting, and at the same time, blow argon gas into the converter for 5 minutes, and use the sliding plate slag blocking method to block the slag material and ...

Embodiment 3

[0078]A low-cost slab Q235B steelmaking process, comprising the following steps:

[0079] Step 1. Prepare molten iron and steel scrap. Control the temperature of the molten iron to 1450°C and the slag content to 0.5%, then add the molten iron to the converter, preheat the scrap steel to 550°C and put it into the converter for smelting;

[0080] Step 2: Blow oxygen into the lowering gun, add slag to the converter, control the gun position to 1.2m, the oxygen pressure to 0.8MPa, and the flow rate to 17000m 3 / h, after 4 minutes of treatment, carry out the pressure gun to pull carbon treatment, lower the gun position to 1.0m, control the oxygen pressure and flow rate to remain unchanged, continue the treatment for 50 seconds, lift the gun and stop blowing in oxygen;

[0081] Step 3: Use compound deoxidizer to carry out deoxidation treatment at the end of converter smelting, and at the same time, blow argon gas into the converter for 5 minutes, and use the sliding plate slag block...

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Abstract

The invention discloses a low-cost slab Q235B steelmaking technology. The low-cost slab Q235B steelmaking technology comprises the steps of raw material preparation and pretreatment, lance-lowering oxygen blowing in a converter, deoxidation treatment, covering agent feeding and continuous casting of molten steel. By adopting a compound deoxidizing agent at the end point of converter steelmaking for deoxidation treatment, compared with a traditional Si-Ba-Ca deoxidizing agent, Si-Al-Fe adopted as the deoxidizing agent of the molten steel in the scheme has the advantages that the liquidity of the molten steel can be made to be good, the deoxidizing capacity of Si-Al-Fe is high, aluminum oxide in the molten steel can be reduced, the form of the aluminum oxide can be changed, complete floating of the aluminum oxide is facilitated, thus the molten steel is completely deoxidized, then a yield of alloy in steel billets is effectively improved, after a covering agent is applied after tapping of the molten steel, the solidification time of the molten steel of a riser can be prolonged, thus the feeding capacity of the riser is improved, and the covering agent in the scheme has dual effects of heating and heat preservation so that the feeding capacity of the riser can be obviously improved, and the quality and a yield of slabs are improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a low-cost slab Q235B steelmaking process. Background technique [0002] The essence of slab bubble formation is that during the solidification process of continuous casting molten steel, as the temperature decreases, the solubility of free or combined gases (O, N and H, etc.) in molten steel decreases, and free gases will flow from molten steel Iron oxides will also react with carbon to form carbon monoxide gas to precipitate. If the precipitated gas cannot overflow to the outside in time, slab bubble defects will occur after the molten steel is solidified and formed. According to its distribution position and size, Also called surface or subcutaneous air bubbles, pores and pinholes, generally about 1mm in diameter and about 10mm in length. [0003] Slab porosity is a common defect in continuous casting slabs. This defect will cause defects such as surface cracks and skin w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/072C21C5/32
CPCC21C7/06C21C7/072C21C5/32Y02P10/20
Inventor 王光文张盛梁陈贵和涂文兴
Owner 福建三宝钢铁有限公司
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