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In order to save more weight using steel sheet, Thyssen Stahl has recently completed research work on creating a very light-weight composite steel material. Two thin steel sheets currently as low as 0.30 mm in thickness are joined by local welds of a certain spacing. Prior to joining, locally formed, hemispherically shaped domes are used to keep the cover sheet metals at the intended distance. These depressions can be applied either to one, or even to both cover sheet metals. The total thickness of the final compound steel sheet varies from 1.0 mm to 1.8 mm. The material weight per unit area is equal to 0.7 mm, yet it is able to serve for certain mechanical properties of about 1.0 mm solid steel. A weight saving of 30 % seems possible for specific panel applications. Because of the similarity between the depression shape and a bubble, the material is designated as “Bubble Steel Sheet Metal”.