MECHANICAL COMPONENT AND METHOD OF SURFACE HARDENING

摘要

Mechanical component (10) having a hole (12) extending therethrough and having a minimum thickness (T) of 7 mm, measured from an interior surface (12a, 12b) constituting the outer perimeter of the hole (12) radially outwards to an outer surface of said mechanical component (10). The maximum transverse dimension (d) of said hole (12) is 31.75 mm or less and that at least one part (22) of interior surface (12a, 12b) material of the mechanical component (10) constituting the outer perimeter of said hole (12) comprises a martensitic microstructure produced by induction hardening using an electromagnetic induction coil (14) positioned inside said hole (12) followed by immediate quenching using a quenching device (16) that is positioned inside said hole (12) when the electromagnetic induction coil (14) has been removed from said hole (12) or while the electromagnetic induction coil (14) is being removed from said hole (12).