I can see an anneal as first, then machine rough, then heat treat, stress relieve, then finish machine, then nitride, straighten, then finish grind etc. Electroplating and stipping before and after the heat treat sessions.
25 to 30 ?? Explain why please. I bet they trimmed that way down in war time.
I've worked on forged steel airframe parts and they never saw 25 to 30 heat treat cycles, it was pretty much what I described above.