Steel Aermet 100 AMS 6478

AMS 6478 is the aerospace material specification covering AerMet 100 (UNS K92580) bar and forging, vacuum melted and supplied in the annealed condition. AerMet 100 is a cobalt-nickel martensitic ultra-high-strength steel prized for combining a tensile strength of up to 290 ksi (1999 MPa) with exceptional fracture toughness and stress corrosion cracking resistance for service up to 800°F (427°C).

What defines AMS 6478 within the AerMet 100 bar and forging family is its supplied condition: material is delivered annealed and soft, ready to be rough-machined before the fabricator applies the final heat-treat cycle (solution treat, cold stabilize, and age) to develop the full 290 ksi tensile strength. This makes AMS 6478 the preferred choice when parts require extensive machining or forming prior to hardening, giving shops maximum control over the final heat-treat response.

Typical applications for AMS 6478:

• Aircraft landing gear components and structural members
• Jet engine shafts and drive shafts
• High-strength fasteners and actuators
• Defense, armor, and ordnance components

For material supplied already in the normalized and overaged, precipitation-hardenable condition, see the companion specification AMS 6532.

Tech Steel & Materials stocks and supplies AMS 6478 bar and forging to aerospace and defense tolerances – request a quote for certified material cut to your size and quantity.