Maintaining Scrap as Material

Hi,

I have a Material "X"(Structural Steel plate) whose UOM is ton, after usage of it some portion of material will be left over as scrap.

Query: Now scrap material(based on Length x Width x thickness)need to maintained which may be used in future. On every usage of above said Material "X" may leave same or different sizes. How to get/Maintain what are all available sizes available for future use.