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SAE-AISI A7 Steel vs. Grade 4 Titanium

SAE-AISI A7 steel belongs to the iron alloys classification, while grade 4 titanium belongs to the titanium alloys. There are 21 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A7 steel and the bottom bar is grade 4 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 72
41
Tensile Strength: Ultimate (UTS), MPa 800 to 2150
640

Thermal Properties

Latent Heat of Fusion, J/g 260
420
Melting Completion (Liquidus), °C 1470
1660
Melting Onset (Solidus), °C 1430
1610
Specific Heat Capacity, J/kg-K 470
540
Thermal Conductivity, W/m-K 37
19
Thermal Expansion, µm/m-K 12
9.4

Otherwise Unclassified Properties

Base Metal Price, % relative 10
37
Density, g/cm3 7.7
4.5
Embodied Carbon, kg CO2/kg material 13
31
Embodied Energy, MJ/kg 200
500
Embodied Water, L/kg 100
110

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 29 to 77
40
Strength to Weight: Bending, points 25 to 48
37
Thermal Diffusivity, mm2/s 10
7.6
Thermal Shock Resistance, points 27 to 72
46

Alloy Composition

Carbon (C), % 2.0 to 2.9
0 to 0.080
Chromium (Cr), % 5.0 to 5.8
0
Copper (Cu), % 0 to 0.25
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 81.4 to 87.7
0 to 0.5
Manganese (Mn), % 0 to 0.8
0
Molybdenum (Mo), % 0.9 to 1.4
0
Nickel (Ni), % 0 to 0.3
0
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.4
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
98.6 to 100
Tungsten (W), % 0.5 to 1.5
0
Vanadium (V), % 3.9 to 5.2
0
Residuals, % 0
0 to 0.4