Descriptors | Steels, Billets, Bars (materials), Forgings, Wires, Springs, Aircraft components, Air transport engineering, Visual inspection (testing), Quality assurance, Sampling methods, Mechanical testing, Fracture, Test specimens, Marking, Nitriding steels, Unalloyed steels, Dimensional tolerances, Case-hardening steels, Acceptance (approval), Heat treatment, Precipitation hardening, Austenitic steels, Bolts, Nuts, Dimensions, Non-metallic inclusions, Temperature control, Grain size |