G-CoCr28 (2.4778) Cobalt-Chromium Alloy
Other
Property Overview
Density8.1g/cm³
Elastic Modulus210GPa
Tensile Strength490MPa
Yield Strength260MPa
Brinell HardnessUnknown
Maximum Service Temperature1200°C
Chemical Composition
C
0.050 to 0.25%
CR
27 to 30%
NI
0 to 4.0%
MO
0 to 0.5%
MN
0 to 1.5%
SI
0.5 to 1.5%
P
0 to 0.040%
S
0 to 0.030%
NB
0 to 0.5%
CO
48 to 52%
FE
9.7 to 24.5%
Mechanical
A - Min. elongation at fracture (%)
6
Elastic (Young's, Tensile) Modulus
210 GPa
Elongation at Break
6.7 %
Fatigue Strength
130 MPa
Poisson's Ratio
0.28
R p0.2 0.2% proof strength (MPa)
235
Rm - Tensile strength (MPa)
490
Shear Modulus
83 GPa
Tensile Strength: Ultimate (UTS)
560 MPa
Tensile Strength: Yield (Proof)
260 MPa
Hardness
+A Soft annealed +AC Annealed to achieve spheroidization of the carbides +AR As rolled +AT Solution annealed +C Cold drawn / hard +CR Cold rolled +FP Treated to ferrite-pearlite structure and hardness range +I Isothermal annealing +LC Cold drawn / soft +M Thermo mechanical rolling +N Normalized +NT Normalized and tempered
+P Precipitation hardened +PE Peeled +QA Air quenched and tempered +QL Liquid quenched and tempered +QT Quenched and tempered +S Treated to improve shearability +SH As rolled and turned +SR Cold drawn and stress relieved +T Tempered +TH Treated to hardness range +WW Warm worked +U Untreated
+A
Physical
Density
8.1 g/cm 3
Thermal
Latent Heat of Fusion
320 J/g
Maximum Temperature: Mechanical
1200 °C
Melting Completion (Liquidus)
1330 °C
Melting Onset (Solidus)
1270 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
8.5 W/m-K
Thermal Diffusivity
2.2 mm 2 /s
Thermal Expansion
14 µm/m-K
Thermal Shock Resistance
14 points
Calculated
Resilience: Ultimate (Unit Rupture Work)
31 MJ/m 3
Resilience: Unit (Modulus of Resilience)
160 kJ/m 3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
19 points
Strength to Weight: Bending
19 points
Environmental
Base Metal Price
100 % relative
Embodied Carbon
6.2 kg CO 2 /kg material
Embodied Energy
84 MJ/kg
Embodied Energy
84 MJ/kg 36 x 10 3 BTU/lb
Embodied Water
440 L/kg
Embodied Water
440 L/kg 53 gal/lb
Registered Designations & Aliases
2.47782.4778G-CoCr28G-CoCr28 (2.4778) Cobalt-Chromium Alloy
Standards
EN 10295 EN 10295: 2002 Heat resistant steel castings
EN 10295 EN 10295: Heat Resistant Steel Castings