Impact Test - A test used to determine the impact energy measured in foot pounds, to fracture a material by means of an Izod or Charpy test.

Inclusion Shape Control - The use of rare earth metals or calcium alloys to control the morphology of inclusions, in order to provide improved mechanical properties for select applications.

Inclusions - Particles of foreign material (such as oxides, sulfides or silicates) in steel as cast.

Ingot - A steel casting that is cast into a mold which when solidified will be rolled in a blooming mill to plates, slabs for sheets, or blooms and billets into structural’s and bars.

Izod Test - An impact test similar to the charpy with the difference being in the test specimen. In the Izod test the specimen is 2.953” long,.3937” square with a 45” notch located 1.1024” from the impact end. The distance from the bottom of the notch to the opposite side is .315”.