Overview
The 100x400 steel beam is a standardized structural component, where '100' and '400' typically denote its width and height in millimeters. It is a staple in heavy construction and industrial projects due to its optimal balance of strength and weight efficiency. Engineers favor this dimension for medium-to-large spans where uniform load distribution is critical. The beam's rectangular cross-section provides superior resistance to bending forces compared to I-beams of equivalent weight, making it ideal for horizontal support applications.
Structure and Working Principle
This hot-rolled beam features a solid rectangular profile with consistent thickness throughout its length. The 100mm width offers lateral stability, while the 400mm depth maximizes the moment of inertia – a key factor in resisting deflection under load. In structural systems, these beams transfer loads vertically through their shear strength and horizontally via their bending stiffness. The uniform geometry allows for predictable performance calculations, simplifying engineering designs. Connection methods typically include bolting through pre-drilled holes or welding to supporting columns.
Key Features
Load capacity stands out as the primary feature, with a typical 100x400 carbon steel beam supporting 10-15 metric tons per linear meter depending on span length. The standardized dimensions ensure compatibility with construction software and modular building systems. Secondary benefits include fire resistance (when properly insulated) and recyclability. Modern versions often incorporate corrosion-resistant coatings like hot-dip galvanization, extending service life in harsh environments by 20+ years without maintenance.
Application Areas
In commercial construction, these beams form the backbone of multi-story office buildings and shopping malls, particularly in floor support systems. Infrastructure projects utilize them for bridge girders where their torsional rigidity handles dynamic vehicle loads. Industrial applications include heavy machinery platforms in factories and conveyor system supports in mining operations. Some agricultural facilities employ them for grain silo frameworks due to their resistance to lateral pressure from stored materials.
Maintenance and Precautions
Routine inspections should check for signs of corrosion, especially at connection points where protective coatings may be compromised. In coastal areas, stainless steel variants or additional cathodic protection may be necessary. Installation requires proper alignment verification – even minor deviations can create stress concentrations. Thermal expansion considerations are critical in environments with temperature swings exceeding 30°C, requiring expansion joints every 30-40 meters in continuous runs.
B2B Procurement Guide
Bulk purchases (20+ tons) typically secure 8-12% discounts from mills. Lead times range from 2-6 weeks for standard grades, while specialty alloys may require 8-10 weeks. Always verify mill certificates for chemical composition and mechanical properties. Key procurement metrics include: minimum yield strength (typically 355 MPa for S355 grade), impact resistance at lowest service temperature, and straightness tolerance (usually ≤1mm per meter). Consider FOB terms for cost efficiency when importing, ensuring compliance with destination country standards like ASTM A36 or EN 10025.
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