Cobalt Alloys L605

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Cobalt Alloys L605

Alloy L605 (also referenced as HAYNES® 25) is the strongest of the fabricable cobalt alloys, useful for continuous service to 1800°F. Because of its long and widespread use, this alloy has been the subject of many investigations to determine its properties over a wide range of conditions, thus making it an unusually well characterized material. When exposed for prolonged periods at intermediate temperatures, alloy L605 exhibits a loss of room temperature ductility in much the same fashion as other superalloys, such as alloy X or alloy 625.

L605 is welded using gas tungsten arc, gas metal arc, shielded metal arc, electron beam and resistance welding. Submerged arc welding is not recommended. Use good joint fit-up, minimum restraint, low interpass temperature and cool rapidly from welding. For maximum ductility, fabricated components should be annealed 2150-2250°F, rapid cool.
Chemistry
Cr Ni Co W C Fe Mn Si P S
MIN 19.0 9.0 - 14.0 0.05 - 1.0 - - -
MAX 21.0 11.0 Balance 16.0 0.15 3.0 2.0 0.4 0.04 0.03
Specifications
  • AMS 5537, AMS 5796
  • EN 2.4964
  • GE B50A460, UNS R30605
  • Werkstoff 2.4964
Inventory

L605 Coil, L605 Sheet, L605 Weld Wire

Common Trade Names

HAYNES® 25, L-605 Alloy

Features

  • Outstanding high temperature strength
  • Oxidation resistant to 1800°F
  • Galling resistant
  • Resistant to marine environments, acids and body fluids
Applications
  • Gas turbine engine components such as combustion chambers and afterburners
  • High temperature ball bearings and bearing races
  • Springs
  • Heart valves
Physical Properties

Density: 0.330 lb/in3
Melting Range: 2425-2570°F

Temperature, °F 70 800 1000 1200 1400 1600 1800
Coefficient* of Thermal Expansion,
in/in°F x 10-6
- 7.8 8.0 8.2 8.6 9.1 9.4
Thermal Conductivity
Btu • ft/ft2 • hr • °F
- 10.0 11.2 12.5 13.7 15.2 16.7
Modulus of Elasticity Dynamic, psi x 106 33 28 27 26 24 23 21

* 70°F to indicated temperature.

Mechanical Properties

Representative Tensile Properties, Sheet

Temperature, °F 70 1200 1400 1600 1800
Ultimate Tensile Strength, ksi 146 108 93 60 34
0.2% Yield Strength, ksi 69 48 41 36 18
Elongation, % 51 60 42 45 32

Typical Stress-Rupture Strength

Temperature, °F 1200 1400 1500 1600 1700 1800
100 Hours, ksi 69 36 25 18 12 7
1,000 Hours, ksi 57 26 18 12 7 4
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