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Manufacturing defects in steel are deviations or imperfections that occur during the production process of steel, which can compromise its mechanical properties, durability, and performance in construction and industrial applications. In the context of building services and maintenance, understanding these defects is crucial because steel is a primary structural material, and any compromise in its quality can lead to structural failures, increased maintenance costs, and reduced service life of a building. These defects may arise due to issues in raw materials, production techniques, or handling during processing, and they often require careful inspection and remediation to ensure safety and performance. One common type of manufacturing defect is surface defects, which include cracks, scales, laps, and seams. Cracks may appear on the surface of steel during cooling if the material experiences uneven contraction, residual stresses, or rapid cooling from high temperatures. Scales are oxide layers formed on steel surfaces during hot rolling or heat treatment processes, and if not removed properly, they can affect welding, coating, and the overall appearance of steel components. Laps and seams are linear discontinuities that occur when metal folds over itself during rolling or forging, creating areas of weakness that may not be visible but can significantly reduce tensile strength and fatigue resistance. Internal defects are also critical and include voids, porosity, inclusions, and segregation. Voids are tiny cavities trapped within the steel matrix during solidification, which can reduce the effective cross-sectional area and compromise load-bearing capacity. Porosity occurs when gases such as hydrogen or nitrogen are trapped within the molten steel, forming bubbles that leave small holes or cavities upon solidification. Non-metallic inclusions, such as oxides, sulfides, and silicates, may enter the steel from raw materials or furnace processes, acting as _________ _______ _______ ___ ____ _________ __________ _____ _________ _________.
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