High-strength low-alloy steel resistant to sulfuric acid dew point corrosion

Abstract

The invention provides high-strength low-alloy steel resistant to sulfuric acid dew point corrosion, which is characterized in that the steel contains the following components (in percentage by weight): 0.01 to 0.10 percent of C, 0.20 to 0.40 percent of Si, 0.35 to 1.0 percent of Mn, 0.01 to 0 .05 percent of S, 0.3 to 0.6 percent of Ni, 0.5 to 1.0 percent of Cr, 0.3 to 0.5 percent of Cu, 0.01 to 0.15 percent of Sb, 0.01 to 0 .10 percent of Re, 0.01 to 0 .10 percent of Mo, 0.01 to 0 .10 percent of Nb, 0.01 to 0 .10 percent of Ti, 0.01 to 0 .10 percent of V, and the balance of Fe and inevitable impurities, wherein the total content of alloying elements is less than or equal to 3. The invention has a plurality of alloying elements added at the same time, so that the effects of high strength and corrosion resistance are achieved through the small-amount multi-component effect of the alloying elements.

Description

technical field

[0001] The invention belongs to the technical field of low-alloy steel, and specifically relates to a sulfuric acid dew-point corrosion-resistant high-strength low-alloy steel which utilizes a small amount of multi-element alloying and the synergistic effect between elements to achieve excellent corrosion resistance and high strength. Background technique

[0002] Sulfuric acid dew point corrosion-resistant steel is widely used in metallurgy, electric power, petrochemical and other industrial fields, where coal or heavy oil is the main fuel for flue gas treatment systems, such as air preheaters, economizers, flues, chimneys, and railway vehicles in low-temperature parts of boilers , oil derricks, oil production platforms, and desulfurization devices in chemical and petroleum equipment. Domestic research and development of sulfuric acid dew point corrosion-resistant steel started relatively late, and the composition system and use standards generally refer to ...

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