DH steel is a dual-phase steel, and its manufacturing process is to control the microstructure of the steel plate by controlling the cooling rate and temperature during hot rolling, so that it has high strength and good ductility at the same time.
DP steel is a dual-phase composite steel, and its manufacturing process is to prepare a martensite structure with high strength during hot rolling, and then compound it with a ferrite structure with good ductility through heat treatment.