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SAE-AISI T4 Steel vs. R30035 Cobalt

SAE-AISI T4 steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 21 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI T4 steel and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220 to 230
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 80
84 to 89
Tensile Strength: Ultimate (UTS), MPa 800 to 2140
900 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1810
1440
Melting Onset (Solidus), °C 1750
1320
Specific Heat Capacity, J/kg-K 410
440
Thermal Conductivity, W/m-K 21
11
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 55
100
Density, g/cm3 9.4
8.7
Embodied Carbon, kg CO2/kg material 8.5
10
Embodied Energy, MJ/kg 130
140
Embodied Water, L/kg 120
410

Common Calculations

Stiffness to Weight: Axial, points 12
14 to 15
Stiffness to Weight: Bending, points 21
23 to 24
Strength to Weight: Axial, points 24 to 64
29 to 61
Strength to Weight: Bending, points 20 to 39
24 to 39
Thermal Diffusivity, mm2/s 5.4
3.0
Thermal Shock Resistance, points 24 to 64
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0.7 to 0.8
0 to 0.025
Chromium (Cr), % 3.8 to 4.5
19 to 21
Cobalt (Co), % 4.3 to 5.8
29.1 to 39
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 66.3 to 72.3
0 to 1.0
Manganese (Mn), % 0.1 to 0.4
0 to 0.15
Molybdenum (Mo), % 0.4 to 1.0
9.0 to 10.5
Nickel (Ni), % 0 to 0.3
33 to 37
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0.2 to 0.4
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0
Tungsten (W), % 17.5 to 19
0
Vanadium (V), % 0.8 to 1.2
0

Comparable Variants