AMS 5759 L-605 Cobalt Alloy: Material Properties and Applications

2025-05-27

AMS 5759 specifies the requirements for L-605, a high-performance cobalt-based superalloy known for its exceptional strength, oxidation resistance, and corrosion resistance at elevated temperatures. This alloy is supplied as bars, forgings, and rings, meeting stringent mechanical property standards for demanding aerospace and industrial applications.

Key Material Properties of L-605 Cobalt Alloy

Mechanical Properties (Minimum Requirements for Bars)

Tensile Strength: 125 ksi (862 MPa)
Yield Strength: 45 ksi (310 MPa)
Elongation: 30%
Hardness: 277 HB (Brinell) max

High-Temperature Performance

Maintains high strength up to 1500°F (815°C)
Excellent oxidation resistance up to 2000°F (1093°C)
Resistant to carburizing atmospheres up to 1600°F (871°C)

Corrosion Resistance

High chromium content provides resistance to:

Wet chlorine
Hydrochloric acid
Nitric acid

Performs well in hot and corrosive environments

Additional Characteristics

Non-magnetic
Good formability when properly heat-treated
Suitable for fabrication followed by annealing for maximum ductility

Composition

Element	Min.	Max.
Carbon	0.05	0.15
Manganese	1.00	2.00
Silicon	—	0.40
Phosphorus	—	0.040
Sulfur	—	0.030
Chromium	19.00	21.00
Nickel	9.00	11.00
Tungsten	14.00	16.00
Iron	—	3.00
Cobalt	remainder

Minimum tensile property requirements

Property	Value
Tensile Strength	125 ksi (862 MPa)
Yield Strength at 0.2% Offset	45.0 ksi (310 MPa)
Elongation in 4D	30%

Heat Treatment of L-605 Alloy

To achieve optimal mechanical properties, L-605 undergoes solution heat treatment:

Temperature Range: 2150–2250°F (1177–1232°C)
Holding Time: Duration based on section thickness (±25°F tolerance)
Cooling Rate: Air cooling or faster (rapid cooling recommended for maximum ductility)

Common Applications of AMS 5759 L-605

Due to its outstanding high-temperature strength and corrosion resistance, L-605 is widely used in:

Jet engine components (combustors, afterburners, exhaust systems)
Land-based gas turbine combustor liners
Industrial furnace parts
Chemical processing equipment
High-temperature fasteners and seals

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Contact Lork Group today for the best deals on L-605 Cobalt Alloy! Get a free quote and discover why leading aerospace and industrial manufacturers trust us for high-performance cobalt alloys.