involving particular fabrication steps or treatments of ingots or slabs

Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment > during manufacturing of plates or strips > involving particular fabrication steps or treatments of ingots or slabs

Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) > during manufacturing of plates or strips (C21D8/12 takes precedence) > involving particular fabrication steps or treatments of ingots or slabs