Jiangxi youlinsheng fireproof coating tells you that the steel structure has the phenomenon of strength reduction and creep at high temperature. For steel used in construction, the strength does not change below 260℃, and starts to decline from 260℃ to 280℃. When reaching 400℃, the yield phenomenon disappears and the strength decreases obviously. When the temperature reaches 450℃ ~ 500℃, the internal recrystallization decreases the strength rapidly. As the temperature increases further, the steel structure will lose its bearing capacity. Creep also occurs at lower temperatures, but the higher the temperature, the more obvious the creep. In recent years, steel structure buildings without effective fire protection measures have collapsed in large areas, causing casualties of building users and fire rescue personnel. These fire accident lessons show that if the steel structure does not take effective fire protection measures, the fire resistance performance is poor, therefore, in the code revision cancelled the steel structure and other metal structure members can not take fire protection measures related provisions.

Steel structure or other metal structure fire protection measures, generally including inorganic refractory material coating and fire paint spraying and other ways, considering the masonry, mortar, fire board and other inorganic refractory material coating reliability is better, should be preferred. The fire protection of the metal structure of these parts shall meet the fire resistance limit requirements of the corresponding fire-resistant grade of the building stipulated in article 3.2.1 of this code.

Principles of fire protection and heat insulation of ultra-thin or thin steel structure fireproof coating:

Jiangxi youlinsheng fireproof coating tells you coating on the steel structure fire retardant coating of ultra-thin or thin steel structure fire retardant coating is fireproof heat insulation principle of fire retardant coating layer in the fire expansion foam, bubble, bubble layer not only cut off oxygen, but also because of its soft and has a good heat insulation performance, heat can delay part protected the speed of the base material; According to the analysis of physical and chemical principles, the process of coating expansion foam layer because of volume expansion and heat absorption reaction, but also consume the heat when burning, is conducive to reduce the temperature of the system, these aspects of the role, so that fire coatings produce significant fire insulation effect.

Fire and heat insulation principle of thick steel structure fireproof coating:

Coating on steel members of thick steel structure fire retardant coating fireproof heat insulation principle of fire retardant coating is affected by the fire when the coating is basically not volume changes, but the coating is very low thermal conductivity, delay the speed of heat to be confirmed base material, coating itself is non-combustible, fire retardant coating for steel members barrier and prevent thermal radiation effect, avoids the flame and high temperature direct invasion of steel members. And there are some components in case of fire coatings in the mutual reaction and generating non-flammable gas process is endothermic reaction, also consumes a lot of heat, is beneficial to lower the temperature in the system, so the fire prevention effect is remarkable, the steel have efficient fireproof heat insulation protection.

Tell you another kind of steel structure fire retardant coating fireproof coating by coating does not occur when the fire volume change into glaze layer, it can isolate the effect of oxygen, oxygen cannot be protected in combustible substrate contact, so as to avoid or reduce the combustion reaction. But this kind of coating is generated by the glaze shape layer thermal conductivity is often larger, heat insulation effect is poor. In order to obtain certain fireproof heat insulation effect,