AMS 6437 is a sub-type specification of Tool Steel H11. This steel alloy is a part of the “H” group of steels. AMS 6437 has outstanding impact toughness, which makes it a great choice for aircraft parts that require that quality. These parts include landing gear for airplanes and rotor blades and shafts for helicopters. That said, AMS 6437 is not the best choice for parts that require exceptional wear resistant – sub-type specifications of Tool Steel H13 such as AMS 6408 are much better in that regard.
AMS 6437 is available as plate, sheet, and strip. Standard heat treatment of this specification of H11 steel alloy includes annealing to remove preexisting anomalies in the parts, austenitizing (hardening), air and oil quenching, and tempering or double-tempering at temperatures at 840° F (450° C), 930° F (500° C), 1020° F (550° C), 1110° F (600° C), and 1200° F (650° C).
Depending on the tempering treatment used, AMS 6437 shows different hardness, toughness, and ductility properties. Usually, toughness and hardness are inter-dependent, but ductility may be worsened with an increase in hardness. Also, impact toughness decreases with the increase in hardness (tempering at higher temperatures).
AMS 6437 can be readily welded, cold-worked, and formed using conventional methods.