High-silicon austenitic stainless steel resistant to concentrated sulfuric acid corrosion and preparing method of high-silicon austenitic stainless steel

Abstract

The invention provides high-silicon austenitic stainless steel resistant to concentrated sulfuric acid corrosion and a preparing method of the high-silicon austenitic stainless steel, the high-silicon austenitic stainless steel can resist concentrated sulfuric acid corrosion, has good mechanical performance and welding performance, and can be used for producing a device and a pipeline used for producing concentrated sulfuric acid. The stainless steel comprises, by weight percent, 13%-15% of Cr, 13%-17% of Ni, 5.5%-6.5% of Si, smaller than 0.03% of C, smaller than 2% of Mn, smaller than or equal to 0.30% of Al, smaller than 0.1% of N, smaller than 0.04% of P, smaller than 0.02% of S, 0.75%-1.5% of Mo, 0.75%-1.5% of Cu, 0.5%-1% of W, 0.5%-1% of Sn, smaller than or equal to 0.15% of Sb, 0.005%-0.01% of other microelements, and the balance Fe. According to the preparing method, the production technology of mother liquor smelting through a Consteel electric furnace and an intermediate frequency furnace, AOD, LF, casting and electroslag remelting is adopted.

Description

technical field [0001] The invention relates to a high-silicon austenitic stainless steel for corrosion resistance to concentrated sulfuric acid and a preparation method thereof. The stainless steel is suitable for production, processing and use equipment and devices of high-temperature and high-concentration sulfuric acid. Background technique [0002] At present, due to the increasing production, processing and application of high-concentration acid, the application of related equipment has been developed. However, the development and development of high-concentration acid has been limited due to the unsatisfactory current traditional materials and equipment. Concentrated sulfuric acid is a highly corrosive, strong mineral acid with strong oxidizing properties, dehydration properties, low volatility, strong corrosive properties and water absorption properties. At present, most of the products at home and abroad have the disadvantages of high alloy content, high cost, poor ...

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Problems solved by technology

[0007] Swedish brand Sandvic SX and German KRUPP company Nicrofer2509Si7 and other products have good performance in sulfuric acid medium, but they all use Ni base as the main component, so the price is relatively expensive

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