This specification covers an aircraft-quality, low-alloy, heat-resistant steel in the form of bars, forgings, mechanical tubing, and forging stock procured in SI (metric) units.

AMS 6304 is the inch/pound version of this MAM.

These products have been used typically for parts, such as shafts, and fasteners, for service up to 540 degrees C, but usage is not limited to such applications.