Analysis and control of steel section appearance defects

Steel section defects can affect product quality and performance. Below are common defects, their causes, and control measures.

Union Steel Industry Co., Ltd is professional steel sections manufacturer, for more details, please contact:sales@union-steels.com

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.