Boring cutter for borehole of tapping hole of converter

The utility model discloses a boring cutter used for an iron tapping bore hole of a converter, which has lower fabrication cost. The boring cutter comprises a cutter rod (1) and a blade (2) arranged on the cutter rod (1), wherein, a cutting edge (11) is arranged on the blade (2), the blade body is clamped in a blade groove (8) on the cutter rod (1) and fixed through an axial direction positioning structure, the axial direction positioning structure comprises a pulling rod (3), wherein, a lug boss (9) clamped at the end surface of the blade (2) is arranged at the front end of the pulling rod (3), and the rear end of the pulling rod (3) is fixed on the cutter rod (1) after penetrating through a through hole (10) in the cutter rod (1). Because the cutter rod (1) can be made by adopting the common steel, the cost of the boring cutter can be greatly reduced, and the disassembly and the replacement of the blade (2) are more convenient, and the boring cutter of the structure can be widely applied in the processing o