Magnetic disk substrate and method of manufacturing the same.

摘要

A magnetic disk substrate comprising 0.5 wt% to 1.0 wt% of Mo, 0.03 wt% to 0.5 wt% of O + 2N + 0.75C, and a balance of Ti. The alloy plate having a composition of above range is cold-rolled at a rolling ratio of 30% or more to form a magnetic disk substrate material, and the material is thermal-flattened under the following condition: 500 </= T </= -(150/11).t + 7850/11 1 </= t where T represents a thermal-flattening temperature ( DEG C), and t represents a thermal-flattening time (houre), thereby obtaining a magnetic disk substrate having the average grain size of 30 mu m or less.