That would certainly be the most common construction, but with the development of super-plastics it would be surprising if some are not made of it. Actually the first bombs were probably made of vegetables - a gourd filled with gunpowder.
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There were different bombs for different things. The standard bomb had an outer casing made of steel, filled with an explosive similar to TNT. However, there were incendiary bombs, with an outer skin of thin sheet metal, and filled with a hot burning chemical mix intended to start fires. Other bombs were made to penetrate heavy concrete fortifications, a round bomb made to skip across water and destroy dams, and the atomic bombs used at Hiroshima and Nagasaki.
Bombs were made from a steel casing filled with various explosives.
cast iron
They were made by the United States during WW2.
In the United States.