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Lesson 03·Process variants

Gas nitriding — the workhorse and its limits

How dissociating ammonia builds a case in a sealed retort, what the Floe 2-stage cycle actually does, and the difference between a controlled and uncontrolled gas nitride process.

9 min readLesson 3 of 12

Knowledge check

Two gas nitride certificates for the same H13 forge die insert. Certificate A documents 48 hours at 525°C and no atmosphere data. Certificate B documents 72 hours in a 2-stage Floe cycle at 525/565°C, Kn 4.0 stage one and Kn 1.0 stage two, compound layer 6-8 µm γ' dominant, witness coupon ID. Which one documents a controlled result?