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ACI-ASTM CC50 Steel vs. Grade 21 Titanium

ACI-ASTM CC50 steel belongs to the iron alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 22 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CC50 steel and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
140
Poisson's Ratio 0.27
0.32
Shear Modulus, GPa 80
51
Tensile Strength: Ultimate (UTS), MPa 430
890 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 300
410
Maximum Temperature: Mechanical, °C 1100
310
Melting Completion (Liquidus), °C 1420
1740
Melting Onset (Solidus), °C 1370
1690
Specific Heat Capacity, J/kg-K 490
500
Thermal Conductivity, W/m-K 17
7.5
Thermal Expansion, µm/m-K 11
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 14
60
Density, g/cm3 7.6
5.4
Embodied Carbon, kg CO2/kg material 2.7
32
Embodied Energy, MJ/kg 39
490
Embodied Water, L/kg 170
180

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
32
Strength to Weight: Axial, points 16
46 to 69
Strength to Weight: Bending, points 17
38 to 50
Thermal Diffusivity, mm2/s 4.5
2.8
Thermal Shock Resistance, points 14
66 to 100

Alloy Composition

Aluminum (Al), % 0
2.5 to 3.5
Carbon (C), % 0 to 0.5
0 to 0.050
Chromium (Cr), % 26 to 30
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 62.9 to 74
0 to 0.4
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0
14 to 16
Nickel (Ni), % 0 to 4.0
0
Niobium (Nb), % 0
2.2 to 3.2
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.17
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.5
0.15 to 0.25
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
76 to 81.2
Residuals, % 0
0 to 0.4