Hydrochloric acid and sulfuric acid corrosion resistant steel and preparation method thereof

Abstract

The invention provides hydrochloric acid and sulfuric acid corrosion resistant steel and a preparation method thereof. The hydrochloric acid and sulfuric acid corrosion resistant steel comprises, by mass, 0.02-0.04% of C, 0.2-0.4% of Si, 0.8-1.0% of Mn, less than or equal to 0.01% of P, 0.005-0.015% of S, 0.25-0.35% of Cu, 0.3-0.4% of Cr, 0.1-0.2% of Ni, 0.05-0.15% of Sb, 0.05-0.15% of Sn, 0.05-0.15% of Mo and the balance Fe and inevitable impurities. According to the steel and the method, the low-carbon component design is adopted, and a proper amount of copper, antimony, tin and molybdenumare added to improve the corrosion the hydrochloric acid and the sulfuric acid resistance; and the solid solution strengthening is adopted as a main mode, the steel with the yield ratio being less than or equal to 0.70 and the elongation percentage being larger than or equal to 40% is prepared through the low-temperature rolling and relaxation processes, and a hydrochloric acid and sulfuric acid corrosion resistant hot-rolled steel plate with excellent plasticity is prepared.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to a hydrochloric acid and sulfuric acid corrosion-resistant steel and a production method thereof. Background technique [0002] For electric power, petrochemical and other industries, the combustion exhaust gas is mainly composed of moisture, sulfur dioxide, sulfur trioxide, hydrogen chloride, nitrogen oxides, carbon dioxide, oxygen, etc., and it is very easy to generate condensation of hydrochloric acid and sulfuric acid. Usually, the dew point temperature of sulfuric acid is 100 ℃ ~ 150 ℃ The dew point temperature of hydrochloric acid is around 50°C to 80°C. Since the temperature of the combustion gas passing through the exhaust system is constant, the dew point of hydrochloric acid and sulfuric acid will be generated at the same time due to the influence of the wall temperature of the equipment. Therefore, research and development can resist hydrochloric acid at the sam...

AI Technical Summary

Problems solved by technology

At present, most of the existing similar products of domestic enterprises are sulfuric acid corrosion-resistant steels, and the rolling process and mechanical properties have not been studied, so that through the optimized design of the production process, hydrochloric acid and sulfuric acid resistance with excellent plastic properties can be obtained. corroded steel

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