Thick钢结构fire-resistant coating refers to fire-resistant coatings for steel structures with a coating thickness greater than 7mm and less than or equal to 45mm, featuring a granular surface, low density, low thermal conductivity, and fire resistance of over 2 hours. Due to the thick fire-resistant coating being primarily made of inorganic materials, its fire-resistant properties are stable and provide good long-term performance. However, the composition of the fire-resistant coating has large particles and an uneven coating appearance, which affects the overall aesthetic appearance of the building. Structural concealed works. This fire-resistant coating utilizes the granular surface of materials in the fire, low density, low thermal conductivity, or the heat-absorbing properties of the materials in the coating to delay the temperature rise of steel and protect it. The thick fire-resistant coating is prepared by mixing appropriate inorganic binders (such as water glass, silicate sol, aluminum phosphate, refractory cement, etc.), inorganic lightweight insulating materials (such as expanded perlite, expanded vermiculite, suspended particles, floating beads, fly ash, etc.), fire-retardant additives, chemical and reinforcing materials (such as aluminum silicate fibers, rock wool, ceramic fibers, glass fibers, etc.), and fillers, offering the advantage of lower cost. This structure is often sprayed and is suitable for concealed steel structures indoors and outdoors with fire resistance requirements exceeding 2 hours, as well as high-rise full-steel structures and multi-story steel structures. For example: the fire resistance limit of columns in high-rise civil buildings should be 3 hours, and this thick fire-resistant protective coating is required.