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Method for Improving Surface Quality of Sulfuric Acid Dew Point Corrosion Resistant Steel Plate

A dew point corrosion and surface quality technology, applied in the field of improving the surface quality of sulfuric acid dew point corrosion-resistant steel plates, can solve the problems of high price, unfavorable greenness, saving, increased production cost, etc., achieve low cost, improve surface crack defects, and prevent surface cracks Effect

Active Publication Date: 2020-06-05
TANGSHAN HEAVY PLATE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Ni is expensive, and the production cost will increase greatly, which is not conducive to the development of the concept of green and saving.

Method used

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  • Method for Improving Surface Quality of Sulfuric Acid Dew Point Corrosion Resistant Steel Plate
  • Method for Improving Surface Quality of Sulfuric Acid Dew Point Corrosion Resistant Steel Plate
  • Method for Improving Surface Quality of Sulfuric Acid Dew Point Corrosion Resistant Steel Plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: The specific process of the method for improving the surface quality of sulfuric acid dew point corrosion-resistant steel plate is as follows.

[0030] (1) Clean the surface of the slab, and spray the silicon-magnesium coating evenly on the surface of the slab, with a coating thickness of 0.25mm and an amount per unit area of ​​0.32KG / m 2 , the spraying temperature is 200°C, after spraying, let stand for 15 minutes and then install the furnace, the spraying effect can be seen figure 1 . The heating speed is controlled at 8min / cm, and the heating time is controlled at 40min; the surface temperature of the slab is 1100°C when it comes out of the furnace; the heating temperature and air-fuel ratio are controlled: the heating temperature in the preheating section is 970°C, and the air-fuel ratio is 1; The air-fuel ratio is 1; the heating temperature of the second heating section is 1180°C, and the air-fuel ratio is 0.8; the heating temperature of the soaking ...

Embodiment 2

[0034] Embodiment 2: The specific process of the method for improving the surface quality of sulfuric acid dew point corrosion-resistant steel plate is as follows.

[0035] (1) Clean the surface of the slab, spray the silicon-magnesium coating evenly on the surface of the slab, the coating thickness is 0.3mm, and the dosage per unit area is 0.4KG / m 2 , The spraying temperature is 150°C, and the furnace is installed after standing for 20 minutes after spraying. The heating speed is controlled at 6min / cm, and the heating time is controlled at 38min; the surface temperature of the slab is 1180°C when it comes out of the furnace; the heating temperature and air-fuel ratio are controlled: the heating temperature in the preheating section is 965°C, and the air-fuel ratio is 1.2; the heating temperature in the first heating section is 1080°C, The air-fuel ratio is 1.1; the heating temperature of the second heating section is 1220°C, and the air-fuel ratio is 0.9; the heating temperat...

Embodiment 3

[0039] Embodiment 3: The specific process of the method for improving the surface quality of sulfuric acid dew point corrosion-resistant steel plate is as follows.

[0040](1) Clean the surface of the slab, and apply the silicon-magnesium coating evenly on the surface of the slab, with a coating thickness of 0.2mm and an amount per unit area of ​​0.3KG / m 2 , The spraying temperature is 250°C, and the furnace is installed after standing for 18 minutes after spraying. The heating speed is controlled at 8min / cm, and the heating time is controlled at 35min; the surface temperature of the slab is 980°C when it comes out of the furnace; the heating temperature and air-fuel ratio are controlled: the heating temperature in the preheating section is 960°C, and the air-fuel ratio is 1.1; the heating temperature in the first heating section is 1050°C, The air-fuel ratio is 1.1; the heating temperature of the second heating section is 1200°C, and the air-fuel ratio is 0.85; the heating te...

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Abstract

The invention discloses a method for improving the surface quality of a sulfuric acid dew point corrosion resistant steel plate, the method comprises heating, rolling and cooling processes; in the heating process, a refractory coating is sprayed on the surface of a plate blank before the plate blank enters a heating furnace; the temperature of the plate blank is controlled at 980 to 1180 DEG C when the plate blank is discharged from the heating furnace. The method adopts the surface treatment technology before the plate blank is put into the heating furnace to improve the descaling effect, andeffectively reduces the selective oxidation of Cu and Fe elements on the surface of the plate blank during the heating process of the sulfuric acid dew point corrosion resistant steel plate; the lowtemperature heating technology improves formation of a liquid Cu-rich phase on the surface of the steel plate and penetration of the liquid Cu-rich phase along austenite grain boundary, and the methodhas the advantages of preventing the occurrence of cracks on the surface of the steel plate, reducing the surface grinding process of the steel plate, improving the finished product rate, and effectively improving the surface quality of the steel plate. The method can effectively improve the surface crack defect of the sulfuric acid dew point corrosion resistant steel plate and improve the surface quality of the steel plate without adding of a relatively-expensive Ni element to the steel plate component, and the sulfuric acid dew point corrosion resistant steel plate has the characteristics of good surface quality, low cost and simple process and the like.

Description

technical field [0001] The invention relates to a method for controlling the surface quality of a steel plate, in particular to a method for improving the surface quality of a sulfuric acid dew point corrosion-resistant steel plate. Background technique [0002] Sulfuric acid dew point corrosion-resistant steel plate is a small amount of copper, phosphorus, chromium, nickel and other elements added to the steel, so that the steel forms a dense layer of about 50-100um thick between the rust layer and the substrate and has good adhesion to the substrate metal. Due to the existence of this layer of dense oxide film, it prevents oxygen and water in the atmosphere from penetrating into the steel matrix, slows down the development of corrosion into the steel material, and thus greatly improves the corrosion resistance of the steel material. corrosion resistance performance. [0003] When the steel is heated at high temperature, if copper oxide remains in the furnace, the copper o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/68C21D8/02
CPCC21D1/68C21D8/0226C21D8/0247
Inventor 刘志勇任树洋郑文超李行秦坤尹绍江张阔斌李海鹏贾丽君
Owner TANGSHAN HEAVY PLATE CO LTD
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