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Bearing steels are generally at a temperature of 450 ~ 650 ℃ will lose carrying capacity, the occurrence of great deformation, resulting in a steel beam, the steel beam bending, the result can not continue to use due to too large a deformation, generally do not increase the protection of the bearing steel refractoryThe limit is about 15 minutes. This length of time is also related with the speed of the member endothermic.

Make the bearing steel material to overcome the lack of fire prevention in the practical application of fireproof treatment must be carried out, and its purpose is to will the fire resistance of the bearing steel to the design specification limits. Prevent bearing steel in the fire rapidly warming deformation slump, its measures are varied, the key is to take a different approach according to different situations, such as the use of thermal insulation, refractory barrier direct flame burning bearing steel, reduce the heat transfer rate postpone the temperature rise of the bearing steel, the strength becomes weak time. Whatever the method, the principle is the same. Here are several different bearing steel fire protection measures.