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ASTM A217 Cast Steel vs. Grade 21 Titanium

ASTM A217 cast steel belongs to the iron alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 28 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 ASTM A217 cast steel and the bottom bar is grade 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
140
Elongation at Break, % 21 to 27
9.0 to 17
Fatigue Strength, MPa 200 to 320
550 to 660
Poisson's Ratio 0.28 to 0.29
0.32
Reduction in Area, % 39 to 50
22
Shear Modulus, GPa 73 to 75
51
Tensile Strength: Ultimate (UTS), MPa 540 to 710
890 to 1340
Tensile Strength: Yield (Proof), MPa 270 to 460
870 to 1170

Thermal Properties

Latent Heat of Fusion, J/g 250 to 270
410
Maximum Temperature: Mechanical, °C 410 to 600
310
Melting Completion (Liquidus), °C 1450 to 1460
1740
Melting Onset (Solidus), °C 1410 to 1420
1690
Specific Heat Capacity, J/kg-K 470
500
Thermal Conductivity, W/m-K 26 to 50
7.5
Thermal Expansion, µm/m-K 13
7.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4 to 7.0
60
Density, g/cm3 7.8
5.4
Embodied Carbon, kg CO2/kg material 1.5 to 2.1
32
Embodied Energy, MJ/kg 20 to 28
490
Embodied Water, L/kg 47 to 87
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 130
110 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 190 to 570
2760 to 5010
Stiffness to Weight: Axial, points 13 to 14
14
Stiffness to Weight: Bending, points 24 to 25
32
Strength to Weight: Axial, points 19 to 25
46 to 69
Strength to Weight: Bending, points 19 to 23
38 to 50
Thermal Diffusivity, mm2/s 6.9 to 14
2.8
Thermal Shock Resistance, points 16 to 20
66 to 100

Comparable Variants