Form

This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.

Application

These products have been used typically for parts 3.5-inches (89-mm) and under in nominal cross-sectional thickness, requiring a through-hardening steel capable of developing a minimum hardness of 52 HRC, the parts being subject to rigid magnetic particle inspection standards, but usage is not limited to such applications. Except for carbon content and tensile properties this material is similar to AMS6419.

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.