In the Second World War, additives were often used to steel to make it more resistant or otherwise: It was used in jet engines (very expensive to produce and served to keep them active otherwise they broke immediately), in bullets (to be more penetrating), in armor of tanks (make them more resistant). now on hoi4 these have been divided into only two resources: Chromium and Tungsten. Plus the second, since Lo Uk, historically bought ALL Portuguese production so that Germany could not buy it (and Italy too). In fact, if Germany had large quantities of this metal in its reserves (the blessed warehouses of hoi2 and hoi3), Italy had such weak wagons, precisely because there was no tugsten. Here is my idea: Equipment that requires tugsten can be built without tugsten, but they have malus (to reliability or armor, attack etc), if instead they are built with tugsten they are normal. So you should create a type function with oil / fuel where you store and use the tungsten (it is consumed by industries / dockyard) it would be a fantastic function (and with modding even more)
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