What type of steel is generally used for lightweight structural components in aviation?

Alloy steel is typically used for lightweight structural components in aviation due to its favorable balance of strength-to-weight ratio, ductility, and corrosion resistance. Alloy steels are designed with specific elements added to enhance particular properties, making them well-suited for the demanding environments encountered in aviation applications. Their ability to be tailored for high strength while maintaining relatively low weight makes them an ideal choice for components such as airframes and other structures where these characteristics are critical.

While carbon steel is strong, it may not provide the necessary weight savings and corrosion resistance needed in aviation applications. Stainless steel, although it offers excellent corrosion resistance, tends to be heavier and not as efficient for lightweight structures. Titanium alloys, while lightweight and possessing high strength, are often more expensive and complex to work with, making alloy steel a more common choice for many structural components in aircraft design.