Folded Steel
Pattern steel is formed by folding and forging, the process of folding and forging not only makes the structural organization of the steel close to the composite material, but also scatters the iron crystal structure of the original macromolecule, diminishing it and realign to be more tight and even. For example, the composite armor on a tank is formed by stacking plenty of layers of ceramic and steel plates to achieve high penetration resistance, which can be equivalent to several times of the thickness of the homogeneous steel plate. Some people use aluminum plates to form the honeycomb structures, which have higher penetration resistance than aluminum plates of the same thickness.
