The new steels used today are not actually lighter, they are much stronger, some of the ultra high-strength steel, (UHSS) being used today can be four times the strength of the mild steels that were used in the past. This allows stamped parts to be made thinner, which reduces the weight of the part. Note however that in some areas of the vehicle parts are not being made thinner. They actually may be made thicker, even with the use of high strength steel (HSS) and UHSS. This may be done to improve rigidity and increase side impact and rollover protection. That’s where some of the weight is added back into the structure. Additional attributes of the new steels are important to remember. Dual phase, transformation induced plasticity and complex phase steels are easier to form than conventional HSS of comparable strength during the stamping process. As advance high strength steel is stamped into a die to form a part, the steel work hardens and becomes much stronger than the original strength of the base metal in sheet form. This makes for an extremely strong part. Other types steels such as Martensitic, and Boron steels are used in pillars, rockers and roof rails for their strength and resistance to bending rather than energy absorption. This prevents intrusion into the passenger compartment in a collision,