Alloy L605 Cobalt - AMS 5537, AMS 5759

Udimet Alloy® L605 (AMS 5537, AMS 5759) is a cobalt-chromium-tungsten-nickel alloy.  It has good formability, high strength to 1500°F (816°C), and good oxidation resistance up to 1800°F (980°C). This material also has good sulfidation resistance and is well known for resistance to wear and galling. Alloy L605 is used in applications requiring moderate strength and good oxidation resistance at high temperatures.  L605 is non-magnetic, and the high chromium content provides resistance to corrosion in a wide range of environments such as marine, hydrochloric and nitric acids, and wet chlorine. 

L605 Inventory Size Ranges


0.032" - 0.065"

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0.032" - 0.065"

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0.250" - 4.000"

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Thin Gauge Strip

.0008" - .015"

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These L-605 materials feature excellent resistance to the hot corrosive atmospheres of jet engine applications, and its oxidation resistance is good for intermittent service up to 1600°F (871°C) and continuous service up to 2000°F (1093°C).  L605 is especially resistant to carburizing and sulfidizing atmospheres up to 1600°F (871°C).  These properties make it ideal for gas turbine applications, liners, combustion chamber components, and jet engine parts.

Working with alloy L-605

This cobalt alloy features good fabricability, and it can be machined, welded, and formed through most standard methods.  Welding using a submerged arc welding process is not recommended, but other methods like tungsten arc, shielded metal arc, and gas metal arc welding are acceptable - use minimum restraint and low interpass temperatures, with rapid cooling afterward.  L-605 is very ductile, with good forming characteristics for both hot and cold working. 

Standard Inventory Specifications

  • UNS R30605
  • AMS 5537
  • AMS 5759
  • B50TF26

Other industry standards we comply with:

  • GE Aircraft Engine (GT193)
  • GE Aviation S-SPEC-35 AeDMS S-400
  • RR SABRe Edition 2
  • DFARS Compliant

Common Trade Names

  • HAYNES® 25, L-605 Alloy
  • Udimet Alloy L605 (® Special Metals)
  • ATI L-605 (™ Allegheny Technologies)

Common Applications of L605

  • Aircraft engine combustor liners
  • Jet engine and aerospace components
  • Land based gas turbine combustor liners
  • Industrial furnace lines
  • Mufflers and liners for high temperature kilns
  • High temperature ball bearings
  • Marine turbines

Chemical Composition

Alloy L605 Chemical Composition
Element Percent by Weight
Co Cobalt Balance
Cr Chromium 20.00%
W Tungsten 15.00%
Ni Nickel 10%
Fe Iron 3.00 max
Mn Manganese 1.50%
Si Silicon 0.40 max
C Carbon 0.1
S Sulfur 0.030 max
P Phosphorous 0.040 max
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Alloy L605 Physical Properties

Density  0.330 lb/in³   9.14 g/cm³
Melting Range  2375-2425 °F   1300-1330 °C
Specific Heat  0.097 at  70 °F, Bru/lb °F   405 at 21 °C,  J/kg °C
Permeability  1.0007 at 200 oersted
Coefficient of Expansion  6.6 0-200 °F, 10¯6 in/in °F
Thermal conductivity  84 Btu in/ft² h °F   W/wm °C
Electrical Resistivity  613 ohm circ mil/ft   102.0 microhm-cm


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Mechanical Properties and Yield Strength of Alloy L605



Ultimate Tensile

Yield Strength (0.2% OS)

Elong. in 4D %


125 Ksi

45.0 KSi



862 Mpa

310 MPa



Temperature   Rupture strength  
Degrees F Degrees C ksi MPa
1200 649 39 270
1300 704 32 220
1400 760 24 165
1500 816 17 120
1600 871 10 72
1700 927 6 44
1800 982 4 25
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*The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.