Abstract
High-strength steels are used in aerospace for highly critical parts such as landing gear components, control surface hinges, and helicopter transmissions. The main advantages of high strength steels are their extremely high strengths and stiffness. The chapter deals with four types of high-strength steels: medium carbon low alloy steels, high fracture toughness steels, maraging steels, and precipitation hardening (PH) stainless steels. The medium carbon low alloy steels and high fracture toughness steels are primarily used in aircraft landing gears. The requirements for landing gear steels include high static and fatigue strength, high stiffness to resist deformation, resistance to stress corrosion, adequate toughness, and wear resistance where there are moving surfaces. The maraging and precipitation hardening stainless steels are also used for structural components where high strength is required. This chapter presents the compositions of these high strength steels. It emphasizes heat-treating procedures, as heat treatment is critical to the performance of these steels. It also discusses two types of PH stainless steels: semi-austenitic and martensitic.
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