There isn’t enough information provided to determine which industries use DD13 and DX53 specifically. However, both DD13 and DX53 are types of steel, so they can potentially be used in a wide range of industries where steel is needed. Some common industries where steel is used include automotive, construction, manufacturing, and transportation. The specific usage areas for DD13 and DX53 would depend on their specific properties and characteristics, which would be determined by their mechanical and chemical compositions.