Why are stainless steel square tubes used as fire doors?

What materials are used for fire doors? Fire doors, also known as fireproof doors, are designed to maintain the fire integrity of escape routes and provide a means of evacuation. Their primary function is to prevent the spread of fire and smoke in critical fire zones, allowing for a controlled delay in fire propagation to ensure safe evacuation. For safety reasons, the majority of doors in secure passageways are stainless steel fire doors. These doors are categorized into two types based on their opening status: normally closed fire doors and normally open fire doors, typically composed of fire door leaves, door frames, door closers, and sealing strips.

There is a wide variety of stainless steel fire doors available in the market. Typically, they are constructed using stainless steel square pipes with a diameter of 38250.6 or 0.7 wall thickness for the door frames, door leaf skeleton, and door leaf panels. If the door leaf contains filling material, it should be filled with fire-resistant and non-harmful insulation materials, complemented by fire-resistant hardware components. Stainless steel square pipes exhibit excellent performance, sturdy structure, and high safety standards, making them widely used in fire passages, evacuation routes, equipment rooms, and pipeline openings.

So, how should one choose? When selecting fire doors, the exterior should be carefully examined. The welding points of stainless steel square pipes should be firm and symmetrical, with a smooth surface, free from damage or grooves. The corners and seams should be tightly sealed. Stainless steel square pipes produced by Centerway Steel have a bright surface without black lines or sand eyes, smooth and seamless welds, easy welding and corner cutting, uniform thickness with minimal tolerances, good straightness, and high strength and stability.