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ASTM A225 Steel vs. Grade 15 Titanium

ASTM A225 steel belongs to the iron alloys classification, while grade 15 titanium belongs to the titanium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ASTM A225 steel and the bottom bar is grade 15 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 21 to 23
20
Fatigue Strength, MPa 330 to 390
290
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
41
Shear Strength, MPa 390 to 520
340
Tensile Strength: Ultimate (UTS), MPa 620 to 830
540
Tensile Strength: Yield (Proof), MPa 460 to 550
430

Thermal Properties

Latent Heat of Fusion, J/g 250
420
Maximum Temperature: Mechanical, °C 400
320
Melting Completion (Liquidus), °C 1460
1660
Melting Onset (Solidus), °C 1420
1610
Specific Heat Capacity, J/kg-K 470
540
Thermal Conductivity, W/m-K 52
21
Thermal Expansion, µm/m-K 13
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
6.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
37
Density, g/cm3 7.8
4.5
Embodied Carbon, kg CO2/kg material 1.8
32
Embodied Energy, MJ/kg 24 to 25
520
Embodied Water, L/kg 48
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 170
100
Resilience: Unit (Modulus of Resilience), kJ/m3 580 to 820
870
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 22 to 29
33
Strength to Weight: Bending, points 21 to 25
33
Thermal Diffusivity, mm2/s 14
8.4
Thermal Shock Resistance, points 18 to 24
41