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A control method for surface defects of steel slabs resistant to sulfuric acid dew point corrosion

A dew point corrosion and control method technology, applied in the field of metallurgical steelmaking, can solve the problems of weakening the intergranular bonding force, increasing the crack sensitivity of the slab, and reducing the ductility of the slab at high temperature, so as to reduce the sensitivity, improve the surface quality, Effect of improving high temperature ductility

Active Publication Date: 2021-04-20
ANYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main reason is that the chromium element in the steel increases the high-temperature strength of the slab, but reduces the high-temperature ductility of the slab; copper and antimony are elements that are easy to segregate at the austenite grain boundary, which weakens the intergranular bonding force and further increases crack susceptibility

Method used

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  • A control method for surface defects of steel slabs resistant to sulfuric acid dew point corrosion
  • A control method for surface defects of steel slabs resistant to sulfuric acid dew point corrosion
  • A control method for surface defects of steel slabs resistant to sulfuric acid dew point corrosion

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Embodiment 1

[0020] The method for controlling the surface defects of the sulfuric acid dew point corrosion-resistant steel slab of the present embodiment comprises the following steps:

[0021] Step 1: Confirm the working conditions of the key equipment of the continuous casting machine before production: measure and confirm the roll gap, check whether there is blockage / leakage in the spray header, etc.;

[0022] Step 2: Further confirm whether the smelted molten steel meets the requirements of the steel type and casting machine pouring process: tonnage, molten steel temperature, cleanliness, composition ([C]: 0.06%, [Cr]: 0.79%, [Cu]: 0.28% , [Sb]: 0.067%), etc.;

[0023] Step 3: Notify the pump room to adjust the cooling water temperature of the crystallizer and the secondary cooling section 30 minutes before the planned steel pouring production. After the water temperature of the crystallizer reaches 36°C and the water temperature of the secondary cooling section reaches 35°C, the cont...

Embodiment 2

[0029] The method for controlling the surface defects of the sulfuric acid dew point corrosion-resistant steel slab of the present embodiment comprises the following steps:

[0030] Step 1: Confirm the working conditions of the key equipment of the continuous casting machine before production: measure and confirm the roll gap, check whether there is blockage / leakage in the spray header, etc.;

[0031] Step 2: Further confirm whether the smelted molten steel meets the requirements of the steel type and casting machine pouring process: tonnage, molten steel temperature, cleanliness, composition ([C]: 0.071%, [Cr]: 0.83%, [Cu]: 0.31% , [Sb]: 0.043%), etc.;

[0032] Step 3: Notify the pump room to adjust the cooling water temperature of the crystallizer and the secondary cooling section 34 minutes before the scheduled steel pouring production. After the water temperature of the crystallizer reaches 36°C and the water temperature of the secondary cooling section reaches 35°C, the c...

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Abstract

The invention provides a method for controlling surface defects of a steel slab for sulfuric acid dew point corrosion resistance, and belongs to the technical field of metallurgy and steelmaking. The method is as follows: control the water temperature of the crystallizer to not be lower than 36°C, the water temperature difference between the inlet and outlet of the wide side is 3-5°C, and the temperature difference of the water inlet and outlet of the narrow side is 4-7°C; The water temperature in the secondary cooling section is not lower than 35°C, and the cooling mode adopts the segmented control air mist cooling mode. This method can effectively control the surface transverse cracks and corner crack defects of steel for sulfuric acid dew point corrosion resistance, and control the occurrence rate within 1%, which is conducive to improving the pass rate of casting slabs and reducing the defect rate after rolling, thereby reducing costs. .

Description

technical field [0001] The invention relates to the technical field of metallurgy and steelmaking, in particular to a method for controlling surface defects of steel slabs for sulfuric acid dew point corrosion resistance. Background technique [0002] Sulfuric acid dew point corrosion resistant steel is mainly used in high temperature and humid sulfuric acid corrosion environment, and is generally used to make waste flue gas pipes and equipment for sulfide-containing corrosive gases produced by oil refining or coal burning. In order to ensure the corrosion resistance of steel materials, the steel for sulfuric acid dew point corrosion resistance generally adopts a low-carbon composition design ([C]≤0.10%), and at the same time, it is added with chromium ([Cr]: 0.70-1.0%), copper ([ Cu]: 0.20-0.50%), antimony ([Sb]: 0.02-0.10%), silicon ([Si]≤0.50%), manganese ([Mn]≤1.0%) and other elements. In the production process, the surface defects of the slab surface of the sulfuric ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/16B22D11/18B22D11/22C22C38/20C22C38/60
CPCB22D11/16B22D11/18B22D11/225C22C38/20C22C38/60
Inventor 王新志黄重胡玉法段贵生王中岐孙玉强张振申刘海强高新军夏志升孔德南管刘辉王海燕张胜伟张苓志张远强王向松徐刚安亮亮
Owner ANYANG IRON & STEEL
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