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ASTM A227 Spring Steel vs. R30155 Cobalt

Both ASTM A227 spring steel and R30155 cobalt are iron alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is ASTM A227 spring steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 500 to 640
220
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 12
34
Fatigue Strength, MPa 900 to 1160
310
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
81
Shear Strength, MPa 1030 to 1330
570
Tensile Strength: Ultimate (UTS), MPa 1720 to 2220
850
Tensile Strength: Yield (Proof), MPa 1430 to 1850
390

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 52
12
Thermal Expansion, µm/m-K 12
14

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 1.4
9.7
Embodied Energy, MJ/kg 19
150
Embodied Water, L/kg 46
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 260
230
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 61 to 79
28
Strength to Weight: Bending, points 41 to 48
24
Thermal Diffusivity, mm2/s 14
3.2
Thermal Shock Resistance, points 55 to 71
21

Alloy Composition

Carbon (C), % 0.45 to 0.85
0.080 to 0.16
Chromium (Cr), % 0
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 97.4 to 99.1
24.3 to 36.2
Manganese (Mn), % 0.3 to 1.3
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0
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), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.050
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0