We claim the ornamental design for an axe blade, as shown and described.
FIG. 1 is a perspective view of the claimed design.
FIG. 2 is a front elevation view of the claimed design.
FIG. 3 is a rear elevation view of the claimed design.
FIG. 4 is a left side elevation view of the claimed design.
FIG. 5 is a top plan view of the claimed design.
FIG. 6 is a right side elevation view of the claimed design; and,
FIG. 7 is a bottom plan view of the claimed design.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings are for environmental purposes only and form no part of the claimed design.