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

An austenitic stainless steel and manufacturing method technology, applied in the field of austenitic stainless steel, can solve the problems of replacing 304 stainless steel, unusable supports, and low strength of stainless steel, so as to improve pitting resistance, meet service requirements, and be durable Effect of Dilute Sulfuric Acid on Corrosion Ability

Inactive Publication Date: 2017-01-11
BAOSTEEL STAINLESS STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 ac

Method used

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

Examples

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Embodiment 2

[0060] The steels with the chemical compositions shown in Example 2 and Comparative Example 1 were smelted in an electric furnace-AOD duplex, and continuously cast into 200mm thick slabs, wherein the Sn in Example 2 was added by means of tin-plated scrap steel plates; After the slab has been ground, it is heated to 1230°C in the heating furnace and then kept for 240 minutes. It is hot-rolled to a thickness of 3mm, and the final rolling temperature is 980-1020°C. Then it is laminar cooled to 630-680°C for coiling, and cooled to room temperature. The hot-rolled sheet is annealed on a continuous solution line at 1070-1100°C, with a belt speed of 30-50m / min, cooled to room temperature quickly, and then scale-breaking, shot blasting, electrolytic pickling, mixed acid pickling and other processes to remove scale ;The pickling plate is cold-rolled to a thickness of 1mm, the cold-rolled plate is solution annealed at 1060-1100°C, the annealing time is 1.5 minutes, and cooled to 60-75°C...

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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...

Claims

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Application Information

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IPC IPC(8): C22C38/58C21D8/02
Inventor 吴狄峰季灯平陈炳铨
Owner BAOSTEEL STAINLESS STEEL
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