Precipitation hardening of a steel

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A component 1 made from a precipitation hardenable steel is heat treated by sequentially solution heat treating, intermediate heat treating, ageing, re-solution heat treating a region 2 of the component 1 (e.g by induction) and then re-ageing. The component 1 may be a forged steam turbine blade, with the re-solution heat treated region 2 being located on the leading edge 3 of the blade. The component 1 is preferably re-aged at a lower temperature than the initial age and the hardness of the re-aged region 2 is substantially maximised and consequently erosion resistance is enhanced.