ASTM B 639 R30155 Cobalt Alloys

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

Data updates

Latest Update: 2025-07
Total number of updates: 1
Update History

This material has 21 properties — only a subset is shown here.

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ASTM B 639 R30155 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.08 – 0.16
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Co
VALUE
18.50 – 21.00
UNIT
%
CAS NUMBER
7440-48-4
CRITERIA
Cr
VALUE
20.00 – 22.50
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
N
VALUE
val1
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UNIT
%
CAS NUMBER
7727-37-9; 17778-88-0
CRITERIA
Nb
VALUE
val1
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UNIT
%
CAS NUMBER
7440-03-1
CRITERIA
Ni
VALUE
val1
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UNIT
%
CAS NUMBER
7440-02-0
CRITERIA
P
VALUE
val1
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UNIT
%
CAS NUMBER
7723-14-0
CRITERIA
S
VALUE
val1
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UNIT
%
CAS NUMBER
7704-34-9
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

B639: 2025 / Standard Specification for Precipitation Hardening Cobalt-Containing Alloys Rod, Bar, Forgings, and Forging Stock for High-Temperature Service

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ASTM B 639 R30155 Heat Treatments

  • Solution treatment: 1162 to 1190°C (2125 to 2175°F) hold 30 min minimum, water quench.
    Precipitation hardening treatment: 801 to 829°C (1475 to 1525°F) hold 4 h, air or furnace cool.

ASTM B 639 R30155 Mechanical Properties

Temperature

PROPERTY / VALUE
Tensile Strength
≥ 760 MPa
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Brinell Hardness (HB)
≥ 192
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Elongation, A
≥ 30 %
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Reduction of Area
val1
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%
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Yield Strength, Rp0.2
val1
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MPa
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  • -Cross References
  • 13Composition
  • 5Mechanical Properties
  • -Physical Properties
  • 1Heat Treatment
  • -Metallography
  • -Machinability
  • -Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep
  • -Joints
  • -Coatings
  • 2Dimensions
  • -Tribology
  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
  • -Total Suppliers