I have a question regarding corrosion of the anti-wear pads and brackets on the evaporation screen

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Our company operates a waste incineration plant; it underwent minor repairs in August of this year, during which the wear-resistant plates and support frames of the evaporation screen were replaced. During a shutdown for inspection this month, it was found that the evaporation screen was heavily covered with dust, and both the wear-resistant plates and support frames were severely corroded. The wear-resistant plates are made of 304 material, and in addition to corrosion, they also showed severe carbonization. The support frame is made of 316L, and there is clearly an unknown green substance in the corrosion products. The flue gas temperature at the inlet of the evaporation screen is generally between 650 and 680 degrees, with peaks exceeding 700 degrees. I have a question: Is this high-temperature corrosion? What is the green thing? Corrosion-resistant carbonized evaporation screen anti-wear pad