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ACI-ASTM CA15 Steel vs. Grade 7 Titanium

ACI-ASTM CA15 steel belongs to the iron alloys classification, while grade 7 titanium belongs to the titanium alloys. There are 30 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 ACI-ASTM CA15 steel and the bottom bar is grade 7 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
150
Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 21
24
Fatigue Strength, MPa 370
250
Poisson's Ratio 0.28
0.32
Reduction in Area, % 34
34
Shear Modulus, GPa 76
38
Tensile Strength: Ultimate (UTS), MPa 700
420
Tensile Strength: Yield (Proof), MPa 570
340

Thermal Properties

Latent Heat of Fusion, J/g 280
420
Maximum Temperature: Mechanical, °C 750
320
Melting Completion (Liquidus), °C 1440
1660
Melting Onset (Solidus), °C 1500
1610
Specific Heat Capacity, J/kg-K 480
540
Thermal Conductivity, W/m-K 25
22
Thermal Expansion, µm/m-K 10
9.2

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
7.2

Otherwise Unclassified Properties

Density, g/cm3 7.7
4.5
Embodied Carbon, kg CO2/kg material 2.0
47
Embodied Energy, MJ/kg 28
800
Embodied Water, L/kg 100
470

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
95
Resilience: Unit (Modulus of Resilience), kJ/m3 820
560
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 25
26
Strength to Weight: Bending, points 23
28
Thermal Diffusivity, mm2/s 6.7
8.9
Thermal Shock Resistance, points 26
31

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.080
Chromium (Cr), % 11.5 to 14
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 81.8 to 88.5
0 to 0.3
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.25
Palladium (Pd), % 0
0.12 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.5
0
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
98.7 to 99.88
Residuals, % 0
0 to 0.4