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304 stainless steel in general not do high-temperature materials, the use of 304 stainless steel under the thermal insulation in the 450-850 degrees or slow cooling will produce intergranular corrosion. Reduce the corrosion resistance of 304 stainless steel, which can withstand 800-degree heat, but in 800 degrees around its performance is poor, in the sensitization phase, but also depends on environmental humidity, corrosive and other