A kind of corrosion-resistant stainless steel plate and its preparation method and application

Abstract

The invention discloses a corrosion-resistant stainless steel plate, and a preparation method and application thereof. The corrosion-resistant stainless steel plate is characterized by comprising the following components in percentage by mass: at most 0.020% of C, at most 0.80% of Si, at most 1.00% of Mn, at most 0.010% of S, at most 0.030% of P, 19.50-20.50% of Cr, 17.50-18.50% of Ni, 6.50-7.00% of Mo, 0.50-1.00% of Cu, 0.22-0.30% of N, 0.10-0.15% of Re and the balance of Fe. The corrosion-resistant stainless steel has favorable corrosion resistance, mechanical properties and weldability.

Description

technical field [0001] The invention relates to a stainless steel, in particular to a corrosion-resistant stainless steel plate and its preparation method and application. Background technique [0002] Flue gas from coal-fired power plants often contains SO 2 , SO 3 , NO x , HCl, HF and other acid gases, these gases directly discharged into the atmosphere will cause serious environmental pollution, that is, cause acid rain. The report of the "18th National Congress" clearly emphasized the need to strengthen environmental protection and governance, so the emission of flue gas from coal-fired power plants will be subject to increasingly strict restrictions. According to the 2011 version of the standard, the emission limit of air pollutants from thermal power plants (coal-fired boilers) in China is: smoke and dust 20mg / m 3 , sulfur dioxide 50mg / m 3 , nitrogen oxides (NO 2 ) 100mg / m 3 , mercury and its compounds 0.03mg / m 3 . Flue gas from coal-fired power plants must go...

AI Technical Summary

Problems solved by technology

In addition, the absorbed Cl in the condensate droplets - , F - It will also cause localized corrosion such as pitting corrosion and crevice corrosion.

Obviously, the corrosion of wet chimneys is very strong and complex. At present, most of our country uses non-metallic materials as anti-corrosion linings, such as glass flakes, acid-resistant bricks / mortar, borosilicate glass foam blocks, etc., and a few use titanium (TA2) As an anti-corrosion lining, in view of my country's national conditions, the use of nickel-based alloys is too expensive

The inherent defects of non-metallic materials are likely to cause problems such as shedding and aging of the anti-corrosion lining, and the post-maintenance of the non-metallic anti-corrosion lining is troublesome, with a large workload and high life cycle costs; while the processing and manufacturing process of titanium materials is strict, it is easy to cause welding defects , not directly welded to the chimney carbon steel substrate

[0003] However, the anti-corrosion performance of stainless steel materials currently on the market cannot meet the requirements for the use of flue gas desulfurization systems.

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