Ferrium® M54

UNS #K91973

Ferrium® M54 is an ultra-high-strength steel for structural aerospace and other applications where 300M, 4340, and AMS 6532 are typically used. Its mechanical properties are equivalent to those alloys, but with the added benefit of very high toughness for applications requiring high impact resistance or in flaw-tolerant designs. In addition, Ferrium® M54 has greatly improved resistance to stress-corrosion cracking (SCC) compared to conventional ultra-high-strength steels and high hardenability, permitting less severe quench conditions for a given section size and resulting in less distortion during heat treatment. It is double-vacuum VIM/VAR processed by vacuum induction melting followed by vacuum arc remelting to provide optimum metallurgical quality and repeatability.

Type Analysis

  • Carbon (Nominal) 0.3
  • Nickel (Nominal) 10
  • Tungsten (Nominal) 1.3
  • Chromium (Nominal) 1
  • Cobalt (Nominal) 7
  • Molybdenum (Nominal) 2
  • Iron (Nominal) Balance
  • Vanadium (Nominal) 0.1


Aircraft landing gears, arresting tailhooks, blast-resistant or impact containment devices, armor, flap tracks, actuators, drive shafts, load bearing shafts for oil and gas, sporting goods, fasteners and other structural applications.

Applicable Specifications

  • AMS 6516
  • MMPDS-09






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