Form

This specification covers a premium-aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.

Application

These products have been used typically for heat treated parts requiring good tensile and fatigue strengths in combination with good ductility, but usage is not limited to such applications. The product may be through-hardened to tensile strength ranges of 260 to 280 ksi (1793 to 1931 MPa) in nominal section thicknesses of 1.5 inches (38 mm) and under and 180 to 220 ksi (1241 to 1517 MPa) in nominal section thicknesses of 3 inches (76 mm) and under.

Certain design and processing procedures may cause these products to become susceptible to stress-corrosion cracking after heat treatment; ARP1110 recommends practices to minimize such conditions.