AMS 6487 is a sub-type specification of Tool Steel H11 that is characterized by outstanding impact toughness, high chromium content and low carbon content. Tech Steel & Materials offers AMS 6487 as bar and forging. AMS 6487 is typically used for manufacturing of aircraft landing gear and helicopter rotor blades and can be improved in certain areas by various heat treatments. That said, even though AMS 6487 is a favorable alloy for hot-work applications, it finds almost no use for die and tool making.
Depending on the heat treatment use, AMS 6487 can show different properties and qualities. According to independent findings, hardness first increases with heat treatment and then gradually decreases, while impact toughness first decreases and then gradually increases. Ductility, which is important for easier fabrication, gradually decreases with heat treatment and then increases sharply when tempered at temperatures higher than 1100° F (600° C).
The most common tempering temperatures of AMS 6487 are 840° F (450° C), 930° F (500° C), 1020° F (550° C), 1110° F (600° C), and 1200° F (650° C). The preferred tempering method for a combination of hardness, toughness, yield strength, ultimate strength, and ductility is double-tempering at 1020° F (550° C).
AMS 6487 can be readily welded, cold-worked, and formed using conventional methods.