SPHC (JIS G3131) and DD11 (EN 10111) are premium hot-rolled carbon steel coils with 0.10-0.15% carbon content, offering yield strength ≥235MPa and tensile strength 270-410MPa. Optimized for cold forming, welding, and machining, they ensure high dimensional accuracy (±0.1mm thickness) and versatile surface finishes (black, pickled, oiled). Ideal for automotive panels, appliances, and structural components, these grades balance cost efficiency with reliable mechanical properties, delivering superior formability, weldability, and processability for mass production and general engineering applications.