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EN 1.3956 Stainless Steel vs. R30155 Cobalt

Both EN 1.3956 stainless steel and R30155 cobalt are iron alloys. They have 69% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is EN 1.3956 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 27
34
Fatigue Strength, MPa 240
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
81
Tensile Strength: Ultimate (UTS), MPa 650
850
Tensile Strength: Yield (Proof), MPa 330
390

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 460
570
Maximum Temperature: Mechanical, °C 1080
1100
Melting Completion (Liquidus), °C 1420
1470
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Base Metal Price, % relative 22
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 4.8
9.7
Embodied Energy, MJ/kg 68
150
Embodied Water, L/kg 180
300

Common Calculations

PREN (Pitting Resistance) 34
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
230
Resilience: Unit (Modulus of Resilience), kJ/m3 270
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 23
28
Strength to Weight: Bending, points 21
24
Thermal Shock Resistance, points 18
21

Alloy Composition

Carbon (C), % 0 to 0.060
0.080 to 0.16
Chromium (Cr), % 20.5 to 23.5
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 51.9 to 62.1
24.3 to 36.2
Manganese (Mn), % 4.0 to 6.0
1.0 to 2.0
Molybdenum (Mo), % 1.5 to 3.0
2.5 to 3.5
Nickel (Ni), % 11.5 to 13.5
19 to 21
Niobium (Nb), % 0.1 to 0.3
0.75 to 1.3
Nitrogen (N), % 0.2 to 0.4
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0
Vanadium (V), % 0.1 to 0.3
0