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ASTM A225 Steel vs. Grade 28 Titanium

ASTM A225 steel belongs to the iron alloys classification, while grade 28 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 28 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 21 to 23
11 to 17
Fatigue Strength, MPa 330 to 390
330 to 480
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
40
Shear Strength, MPa 390 to 520
420 to 590
Tensile Strength: Ultimate (UTS), MPa 620 to 830
690 to 980
Tensile Strength: Yield (Proof), MPa 460 to 550
540 to 810

Thermal Properties

Latent Heat of Fusion, J/g 250
410
Maximum Temperature: Mechanical, °C 400
330
Melting Completion (Liquidus), °C 1460
1640
Melting Onset (Solidus), °C 1420
1590
Specific Heat Capacity, J/kg-K 470
550
Thermal Conductivity, W/m-K 52
8.3
Thermal Expansion, µm/m-K 13
9.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
36
Density, g/cm3 7.8
4.5
Embodied Carbon, kg CO2/kg material 1.8
37
Embodied Energy, MJ/kg 24 to 25
600
Embodied Water, L/kg 48
370

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 170
87 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 580 to 820
1370 to 3100
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 22 to 29
43 to 61
Strength to Weight: Bending, points 21 to 25
39 to 49
Thermal Diffusivity, mm2/s 14
3.4
Thermal Shock Resistance, points 18 to 24
47 to 66

Comparable Variants