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EN 1.4307 Stainless Steel vs. R30155 Cobalt

Both EN 1.4307 stainless steel and R30155 cobalt are iron alloys. They have 60% of their average alloy composition in common. There are 31 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 EN 1.4307 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 270
220
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 14 to 46
34
Fatigue Strength, MPa 190 to 320
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
81
Shear Strength, MPa 410 to 550
570
Tensile Strength: Ultimate (UTS), MPa 590 to 900
850
Tensile Strength: Yield (Proof), MPa 200 to 570
390

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 420
570
Maximum Temperature: Mechanical, °C 940
1100
Melting Completion (Liquidus), °C 1430
1470
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 16
14

Otherwise Unclassified Properties

Base Metal Price, % relative 15
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 3.0
9.7
Embodied Energy, MJ/kg 43
150
Embodied Water, L/kg 140
300

Common Calculations

PREN (Pitting Resistance) 19
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 210
230
Resilience: Unit (Modulus of Resilience), kJ/m3 100 to 810
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 21 to 32
28
Strength to Weight: Bending, points 20 to 27
24
Thermal Diffusivity, mm2/s 4.0
3.2
Thermal Shock Resistance, points 13 to 20
21

Alloy Composition

Carbon (C), % 0 to 0.030
0.080 to 0.16
Chromium (Cr), % 17.5 to 19.5
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 66.8 to 74.5
24.3 to 36.2
Manganese (Mn), % 0 to 2.0
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 8.0 to 10.5
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0 to 0.1
0 to 0.2
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0