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ACI-ASTM CH20 Steel vs. Grade 7 Titanium

ACI-ASTM CH20 steel belongs to the iron alloys classification, while grade 7 titanium belongs to the titanium alloys. There are 29 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 ACI-ASTM CH20 steel and the bottom bar is grade 7 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
150
Elastic (Young's, Tensile) Modulus, GPa 200
110
Elongation at Break, % 38
24
Fatigue Strength, MPa 290
250
Poisson's Ratio 0.27
0.32
Shear Modulus, GPa 78
38
Tensile Strength: Ultimate (UTS), MPa 610
420
Tensile Strength: Yield (Proof), MPa 350
340

Thermal Properties

Latent Heat of Fusion, J/g 310
420
Maximum Temperature: Mechanical, °C 1100
320
Melting Completion (Liquidus), °C 1410
1660
Melting Onset (Solidus), °C 1430
1610
Specific Heat Capacity, J/kg-K 480
540
Thermal Conductivity, W/m-K 14
22
Thermal Expansion, µm/m-K 15
9.2

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
7.2

Otherwise Unclassified Properties

Density, g/cm3 7.8
4.5
Embodied Carbon, kg CO2/kg material 3.7
47
Embodied Energy, MJ/kg 53
800
Embodied Water, L/kg 180
470

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
95
Resilience: Unit (Modulus of Resilience), kJ/m3 300
560
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 22
26
Strength to Weight: Bending, points 21
28
Thermal Diffusivity, mm2/s 3.7
8.9
Thermal Shock Resistance, points 15
31

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.080
Chromium (Cr), % 22 to 26
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 54.7 to 66
0 to 0.3
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 12 to 15
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 2.0
0
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
98.7 to 99.88
Residuals, % 0
0 to 0.4