The most common classification of steels is by metallurgical differences. As seen in Figure 1, steels can be classified as mild steel, conventional high-strength steel (HSS), and advanced high-strength steel (AHSS). The latter has three generations. Increasing safety and fuel economy regulations have been pressuring the automotive industry to design safer yet lighter vehicles. HSS and AHSS have been replacing mild steels for the last decade in automobile bodies. The typical, recently introduced vehicle contains about 30 percent HSS and 30 percent AHSS.
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