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S13800 Stainless Steel vs. G-CoCr28 Cobalt

S13800 stainless steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is S13800 stainless steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 11 to 18
6.7
Fatigue Strength, MPa 410 to 870
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
83
Tensile Strength: Ultimate (UTS), MPa 980 to 1730
560
Tensile Strength: Yield (Proof), MPa 660 to 1580
260

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Maximum Temperature: Mechanical, °C 810
1200
Melting Completion (Liquidus), °C 1450
1330
Melting Onset (Solidus), °C 1410
1270
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 16
8.5
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Base Metal Price, % relative 15
100
Density, g/cm3 7.9
8.1
Embodied Carbon, kg CO2/kg material 3.4
6.2
Embodied Energy, MJ/kg 46
84
Embodied Water, L/kg 140
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150 to 190
31
Resilience: Unit (Modulus of Resilience), kJ/m3 1090 to 5490
160
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 35 to 61
19
Strength to Weight: Bending, points 28 to 41
19
Thermal Diffusivity, mm2/s 4.3
2.2
Thermal Shock Resistance, points 33 to 58
14

Alloy Composition

Aluminum (Al), % 0.9 to 1.4
0
Carbon (C), % 0 to 0.050
0.050 to 0.25
Chromium (Cr), % 12.3 to 13.2
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 73.6 to 77.3
9.7 to 24.5
Manganese (Mn), % 0 to 0.2
0 to 1.5
Molybdenum (Mo), % 2.0 to 3.0
0 to 0.5
Nickel (Ni), % 7.5 to 8.5
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0 to 0.010
0
Phosphorus (P), % 0 to 0.010
0 to 0.040
Silicon (Si), % 0 to 0.1
0.5 to 1.5
Sulfur (S), % 0 to 0.0080
0 to 0.030