SAE AMS2759/12C

This specification covers the requirements for producing a continuous compound zone (white layer) with controlled extent of porosity by means of a gaseous process, automatically controlled to maintain nitriding and carburizing potentials that determine properties of the nitrocarburized surface. Automatic control is intended to ensure repeatability of nitrogen and carbon content of the compound zone, which influences properties such as wear and corrosion resistance, ductility, and fatigue strength. AMS2759/12C results from a Five-Year Review and update of this specification with changes to Ordering Information, Purpose (see 1.1), Authority (see 1.4), Definitions (see 2.2), Classification (see 3.1), Shutdowns and Alarms (see 3.2.1), Atmosphere Control (see 3.2.2), Stress Relieving (see 3.4.1.2), Racking (see 3.4.1.6), Nitrocarburizing (see 3.4.2), Nitrocarburizing process parameters (see Table 1), Cooling (see 3.4.2.1), Surface Hardness (see 3.5.1), Core Hardness (see 3.5.3), Case Depth (see 3.5.4), Thickness of Compound Zone (see 3.5.5), Compound zone thickness (see Table 3), Presence of Compound Zone (see 3.5.6), Porosity (see 3.5.7), Acceptance Tests (see 4.1.1), Sampling and Testing (see 4.2.1), and Figures 2, 3, 4, 5, and 6.