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Corrosion of sulfuric acid with ferritic stainless steel

I want to know the corrosion mechanism and what influence will mild levels of sulfuric acid have in a exhaust gas from a reheating furnace. Temperature of the gas about 700 °C Concentration of sulfuric acid - not known Basically the flue gas contains H2S, which burns off forming SO2 in the furnace which on cooling reacts with the moisture of the gas to form H2SO4. The gas passes through the recuperator tubes which are made of 11Cr(close to AISI 409)ferritic stainless steel. or 18% Cr 1% Al 1% Si steel (close to AISI 442) What are the remedial measures in terms of 1. Material to be used 2. Changes in operating practice which could minimizes corrosion losses. Could you please help me out with this.

Sudipto Sarkar
steel - Jamshedpur, Jharkhand, India
2003

Dear Mr Sudipto,

I do not have any experience in this area, but I think you have to use grade 2 Titanium pipes instead of Stainless steel.

Khozem Vahaanwala
Saify Ind

Bengaluru, Karnataka, India

2003

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