Steel stair column acts as the vertical load-bearing support for stairs of flat pack container houses, modular buildings and construction site temporary accommodation. It is manufactured from high-strength Q235 carbon steel via cutting, bending and full welding processes. The surface is coated with anti-rust primer to prevent corrosion outdoors. With rigid structural performance, it bears vertical pressure stably and resists bending deformation, ensuring the safety of stair handrails and platforms. All sizes, wall thickness and height can be customized to match your container house stair system. Suitable for prefab dormitories, glamping villas, resort cabins and temporary site offices. Each piece undergoes strict dimensional inspection before shipment