Steel section defects can affect product quality and performance. Below are common defects, their causes, and control measures.
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Insufficient Filling of Steel Section Corners
Characteristics: Rough, incomplete edges due to insufficient metal filling.
Causes: Poor hole design, improper rolling adjustments, worn guide plates, low rolling temperatures.
Control: Optimize hole design, adjust rolling pressure, replace worn guides, maintain appropriate temperature.
Size Out of Tolerance
Characteristics: Geometric dimensions deviate from standards.
Causes: Poor hole design, improper rolling adjustments, uneven billet temperature.
Control: Improve hole design, enhance rolling precision, ensure uniform billet heating.
Rolling Scar
Characteristics: Metal adhesions resembling scars with a regular pattern.
Causes: Worn roughing mills, foreign metal inclusion, poor groove quality.
Control: Replace worn grooves, prevent foreign matter contamination, ensure smooth rolling surfaces.
Lack of Meat
Characteristics: Missing metal on one side of the cross-section.
Causes: Misaligned grooves, poor rolling adjustments, uneven wear.
Control: Improve hole design, prevent roller misalignment, replace worn components.
Scratches
Characteristics: Grooves caused by sharp edges during rolling and transport.
Causes: Sharp equipment edges, poor guide plate installation.
Control: Smoothen equipment surfaces, correctly install and maintain guide plates.
Steel Wave
Characteristics: Undulations due to uneven rolling deformation.
Causes: Inconsistent elongation, improper reduction distribution, worn grooves.
Control: Adjust rolling reduction, replace worn grooves, ensure uniform billet temperature.
Steel Torsion
Characteristics: Twisted cross-sections along the length.
Causes: Misaligned rollers, uneven pressure, improper straightening.
Control: Adjust rolling mill alignment, replace worn guide plates, improve straightening operations.
Steel Bending
Characteristics: Unintended curvature such as sickle bend, wave bend, or elbow.
Causes: Uneven rolling forces, improper cooling, mishandling during transport.
Control: Adjust rolling parameters, improve cooling uniformity, handle steel carefully.
Incorrect Steel Section Shape
Characteristics: Deviations in cross-sectional geometry without surface metal defects.
Causes: Poor groove design, uneven rolling forces, improper cooling.
Control: Optimize rolling processes, ensure uniform deformation, maintain correct cooling procedures.
By implementing these control measures, steel section defects can be minimized, improving overall product quality and performance.
