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ACI-ASTM CN7M Steel vs. R30155 Cobalt

Both ACI-ASTM CN7M steel and R30155 cobalt are iron alloys. They have 75% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7M steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
220
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 44
34
Fatigue Strength, MPa 190
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 480
850
Tensile Strength: Yield (Proof), MPa 200
390

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Maximum Temperature: Corrosion, °C 430
570
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1410
1470
Melting Onset (Solidus), °C 1450
1420
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 21
12
Thermal Expansion, µm/m-K 15
14

Otherwise Unclassified Properties

Base Metal Price, % relative 32
80
Density, g/cm3 8.1
8.5
Embodied Carbon, kg CO2/kg material 5.6
9.7
Embodied Energy, MJ/kg 78
150
Embodied Water, L/kg 210
300

Common Calculations

PREN (Pitting Resistance) 29
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
230
Resilience: Unit (Modulus of Resilience), kJ/m3 110
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 17
28
Strength to Weight: Bending, points 17
24
Thermal Diffusivity, mm2/s 5.6
3.2
Thermal Shock Resistance, points 12
21

Alloy Composition

Carbon (C), % 0 to 0.070
0.080 to 0.16
Chromium (Cr), % 19 to 22
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 37.4 to 48.5
24.3 to 36.2
Manganese (Mn), % 0 to 1.5
1.0 to 2.0
Molybdenum (Mo), % 2.0 to 3.0
2.5 to 3.5
Nickel (Ni), % 27.5 to 30.5
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0