Alloy 53 is designed to feature much better case temper resistance than most conventional alloys.
It is a carburizing steel possessing reliable temper resistance and high case hot hardness while maintaining high core impact strength and fracture toughness.
Alloy 53 is air hardenable, however oil quenching is recommended for optimum impact properties.
The most common application for Alloy 53 is gears where there is an importance placed on temperature resistance.
| AMS Spec | Application |
| AMS 6308 | AMS 6308 is a carburizing steel characterized by high case hot hardness and reliable temper resistance. |