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ACI-ASTM CN7MS Steel vs. Titanium 6-7

ACI-ASTM CN7MS steel belongs to the iron alloys classification, while titanium 6-7 belongs to the titanium alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7MS steel and the bottom bar is titanium 6-7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
120
Elongation at Break, % 39
11
Fatigue Strength, MPa 200
530
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
45
Tensile Strength: Ultimate (UTS), MPa 540
1020
Tensile Strength: Yield (Proof), MPa 230
900

Thermal Properties

Latent Heat of Fusion, J/g 340
410
Maximum Temperature: Mechanical, °C 1040
300
Melting Completion (Liquidus), °C 1400
1700
Melting Onset (Solidus), °C 1350
1650
Specific Heat Capacity, J/kg-K 480
520
Thermal Expansion, µm/m-K 16
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 28
75
Density, g/cm3 7.9
5.1
Embodied Carbon, kg CO2/kg material 5.1
34
Embodied Energy, MJ/kg 71
540
Embodied Water, L/kg 180
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
110
Resilience: Unit (Modulus of Resilience), kJ/m3 140
3460
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
32
Strength to Weight: Axial, points 19
56
Strength to Weight: Bending, points 19
44
Thermal Shock Resistance, points 13
66

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.5
Carbon (C), % 0 to 0.070
0 to 0.080
Chromium (Cr), % 18 to 20
0
Copper (Cu), % 1.5 to 2.0
0
Hydrogen (H), % 0
0 to 0.0090
Iron (Fe), % 45.4 to 53.5
0 to 0.25
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 2.5 to 3.0
6.5 to 7.5
Nickel (Ni), % 22 to 25
0
Niobium (Nb), % 0
6.5 to 7.5
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 2.5 to 3.5
0
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0
84.9 to 88