MIL Composition 21 Cobalt Alloys

Material group: Nonferrous Alloys / Cobalt Alloys
Country / Standard: United States / MIL

Data updates

Latest Update: 2022-09
Total number of updates: 2
Update History
2014-08

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MIL Composition 21 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
As+B+Cu+Mo+P+S+Ti+Zn
VALUE
≤ 1.0000
UNIT
%
CAS NUMBER
CRITERIA
C
VALUE
1.8000 – 2.2000
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Co
VALUE
Remainder
UNIT
%
CAS NUMBER
7440-48-4
CRITERIA
Cr
VALUE
val1
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UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Fe
VALUE
val1
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UNIT
%
CAS NUMBER
7439-89-6
CRITERIA
Mn
VALUE
val1
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UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
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UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
Ni
VALUE
val1
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UNIT
%
CAS NUMBER
7440-02-0
CRITERIA
Si
VALUE
val1
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UNIT
%
CAS NUMBER
7440-21-3
CRITERIA
W
VALUE
val1
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UNIT
%
CAS NUMBER
7440-33-7

MIL-C-24689B: 1992 / Cobalt Alloy Castings, Wear and Corrosion Resistant

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MIL Composition 21 Heat Treatments

  • Stress relieved at 1650°+/- 25°F (900°+/-14°C) for 1 hour per inch of cross section with 2 hours minimum total time at temperature. Castings shall be cooled in the furnace at 250°F (139°C) per hour maximum to 500°F (260°C). Below 500°F (260°C) the castings may be cooled in still air to ambient temperature. Cooling may be done in steps provided the specified cooling rate is maintained.

MIL Composition 21 Mechanical Properties

Temperature

PROPERTY / VALUE
Rockwell Hardness (HR)
≥ 50
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  • -Cross References
  • 10Composition
  • 1Mechanical Properties
  • -Physical Properties
  • 1Heat Treatment
  • -Metallography
  • -Machinability
  • -Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep
  • -Joints
  • -Coatings
  • -Dimensions
  • -Tribology
  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
  • -Total Suppliers