A: Characteristics: Hot-rolled steel vs. Cold-rolled steel

Process: Rolled at high temperature vs. further rolled at room temperature

Surface: Oxide scale, dark color, slightly rough feel vs. smooth, bright surface, good feel

Precision: Larger dimensional tolerances vs. precise dimensions, uniform thickness

Performance: Slightly lower strength, better plasticity vs. higher strength and hardness

Cost: Lower vs. Higher

Applications: Building structures, bridges, truck beams, etc. vs. automotive bodies, appliance panels, precision instruments

Selection Recommendation: Choose cold-rolled steel for products requiring high strength, attractive appearance, and high precision; for structural components with less stringent surface and dimensional requirements, hot-rolled steel offers better cost-effectiveness.