According to the power criterion, steels for the automotive industry are classified as conventional mild metal, conventional high-strength low alloy metal, and advanced high-strength metal . Due to constant growth, there is no constant world terminology to classify high-strength steels. The AHSS steels have complicated multiphase microstructures containing bainite, martensite, and residual austenite, which allow them to achieve unique mechanical properties. The steels with an UTS exceeding one thousand MPs are described as ultra-high-strength steels.
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