Q235B and Q355B steel bars are widely used in construction for manufacturing building steel frame supports, beam and column connecting rods, and prefabricated structural fasteners, as their stable mechanical properties and good weldability ensure structural stability. In machinery manufacturing, they are applied to produce equipment bases, non-high-load transmission shafts, and bracket components, benefiting from easy cutting and forming. They also find use in the automotive industry (for low-stress chassis accessories and carriage frame rods), the agricultural machinery sector (for tractor chassis parts and harvester support rods), and municipal infrastructure (for street lamp pole cores, guardrail uprights, and small bridge connecting parts), meeting the performance needs of general industrial and civil scenarios with cost-effectiveness and reliable usability.