For example: the elements Cr steel can significantly improve the strength, hardness and wear resistance, if the increase in the Cr content of the steel, under the premise of cost control, we can reduce the other elements (such as C, Mn, S, P, Si, cr, Mo, Cu, Ni, Alt, V and other elements) content, and does not affect the mechanical properties of steel reach the yield strength, tensile strength after the break and elongation at break and the like. Therefore, we can create a mathematical model to solve the following problem:
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