Acid rain corrosion-resistant austenitic stainless steel and manufacturing method thereof

Abstract

The invention relates to acid rain corrosion-resistant austenitic stainless steel and a manufacturing method thereof. The acid rain corrosion-resistant austenitic stainless steel comprises the chemical components in percentages by weight: 0.03-0.06% of C, 0.1-1.0% of Si, 5.0-7.0% of Mn, less than or equal to 0.06% of P, less than or equal to 0.01% of S, 16.0-17.0% of Cr, 2.0-3.0% of Ni, 1.0-1.5% of Mo, 2.5-3.5% of Cu, 0.15-0.25% of N, 0.1-0.3% of V, 0.05-0.5% of Sn, 0.001-0.005% of B and the balance of Fe and inevitable impurities, wherein the condition is satisfied as follows: (Cr+3.3Mo+16N) is greater than or equal to 22 but less than or equal to 26. A purpose of improving the capacity of resisting acid rain corrosion of the material is achieved with relatively low cost. The corrosion rate of the steel in a 5% diluted sulfuric acid is less than or equal to 30g / (m<2>.h), and the room temperature tensile strength is greater than or equal to 800MPa, and the steel can partially replace 304 stainless steel to use.

Description

technical field [0001] The invention relates to austenitic stainless steel, in particular to an acid rain-resistant austenitic stainless steel and a manufacturing method thereof. Background technique [0002] Many developing countries, including China, have the problem of severe environmental damage caused by rapid industrialization. Among them, the problem of acid rain corrosion is very serious in some areas. This will inevitably cause a large number of outdoor stainless steel buildings, decorative parts, etc. to rust, corrode and age too quickly due to acid rain, reducing the service life. At present, the medium corroded by acid rain in the atmosphere is mainly dilute sulfuric acid. Therefore, it is very important to improve the corrosion resistance of stainless steel in dilute sulfuric acid. In addition, many outdoor metal objects are mostly structural parts, which play a supporting role, and the strength of the material should not be too low. Therefore, the developmen...

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Problems solved by technology

On the other hand, in recent years, the addition of Sn has been used to improve corrosion resistance. Although the corrosion resistance of Sn-containing ferritic and martensitic stainless steels has generally improved, they are still severely corroded in sulfuric acid, and Its formability is poor, and it cannot replace 304 stainless steel in applications requiring high formability; moreover, Sn-containing ferritic and martensitic stainless steels have low strength and cannot be used for supports with high strength requirements

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