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Sulfuric acid dew point corrosion resistant steel

A dew point corrosion and sulfuric acid resistance technology, applied in the field of acid corrosion resistant steel and sulfuric acid dew point corrosion resistant steel, can solve the problems of affecting heat exchange efficiency, difficult construction, difficult implementation, etc., to achieve outstanding progress, improve acid corrosion resistance, and significantly effect of substantive features

Inactive Publication Date: 2010-11-24
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, restricted by factors such as raw material supply, operational feasibility, and thermal efficiency, it is difficult to implement and the effect is not significant.
Or the use of enamel or non-metallic coatings can avoid the sulfuric acid dew point corrosion of components to a certain extent, but the construction is difficult and affects the heat exchange efficiency

Method used

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  • Sulfuric acid dew point corrosion resistant steel
  • Sulfuric acid dew point corrosion resistant steel
  • Sulfuric acid dew point corrosion resistant steel

Examples

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Embodiment 1

[0020] The mass percentages of the various components of the sulfuric acid dew point corrosion-resistant steel (code name BNS440) in this example are shown in No. 1 of Table 2, and the traditional long process of manufacturing steel products is adopted: blast furnace ironmaking → molten iron pre-desulfurization → converter top-bottom compounding Converting→Ar station / or LF furnace refining→continuous casting→continuous casting slab without defect→inspection→heating→brushing→finish rolling→cooling→coiling→finished hot rolled coil. Production control requirements: Pre-desulfurization of molten iron to control S element below 0.010%; composition adjustment of C, Si, Mn, S, and P in converter top-bottom compound blowing, desulphurization and fine-tuning of composition through Ar station / or LF furnace refining To meet the control requirements, at the same time feed an appropriate amount of iron-calcium wire for secondary refining to ensure the purity of molten steel; continuous cast...

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Abstract

The invention relates to sulfuric acid dew point corrosion resistant steel, belonging to the technical field of metal materials. The steel comprises the following components by mass: 0.05-0.1% of C, 0.1-0.35% of Si, 0.3-0.8% of Mn, 0-0.02% of P, 0-0.01% of S, 0.5-1.0% of Cr, 0.2-0.5% of Cu, 0.04-0.1% of Sb, 0.01-0.06% of Ti, 0.0004-0.001% of Ca and the balance Fe. The steel obviously improves the acid corrosion resistance under the premise of ensuring mechanical property of the steel, not only resists sulfuric acid dew point corrosion but also resists atmospheric corrosion and has obvious substantial characteristics and prominent progress compared with the prior art.

Description

technical field [0001] The invention relates to an acid corrosion-resistant steel, in particular to a sulfuric acid dew point corrosion-resistant steel, which belongs to the technical field of metal materials. Background technique [0002] Sulfuric acid dew point corrosion environment generally occurs on boiler preheater and economizer equipment, air preheater heat exchange elements, transmission pipelines, flue, and chimney. A large number of examples show that sulfuric acid dew point corrosion will cause great damage to the devices in the above industries. An effective way to solve the sulfuric acid dew point corrosion of steel is to suppress the amount of SO2 in the flue gas and the generation of sulfuric acid by reducing the sulfur content in the combustion. However, restricted by factors such as raw material supply, operational feasibility and thermal efficiency, it is difficult to implement and the effect is not significant. Or the use of enamel or non-metallic paint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C33/04
Inventor 刘友荣纪海岩穆海玲韩乃川万兰凤齐志国凌爱兵唐洪乐
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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