Heat resistant steel and stainless acid-resistant steel are crossed each other on the using range, some characteristics of stainless steel with heat resistant steel, can be used as both stainless acid-resistant steel, also can be used as heat resistant steel.Chromium, aluminum, silicon these ferrite formation of the elements, at high temperature can cause the metal surface and the oxide film generated, prevent to oxidation, is to improve the steel oxidation resistance and corrosion resistance to high temperature gas main elements.But aluminum and silicon content is too high will make the room temperature plasticity and thermoplastic seriously deteriorated.Chromium can significantly increase the recrystallization temperature of low alloy steel, content is 2%, the strengthening effect is best.