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EN 1.7221 Steel vs. Grade 25 Titanium

EN 1.7221 steel belongs to the iron alloys classification, while grade 25 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 EN 1.7221 steel and the bottom bar is grade 25 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 11 to 17
11
Fatigue Strength, MPa 290 to 390
550
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
40
Tensile Strength: Ultimate (UTS), MPa 650 to 780
1000
Tensile Strength: Yield (Proof), MPa 430 to 630
940

Thermal Properties

Latent Heat of Fusion, J/g 250
410
Maximum Temperature: Mechanical, °C 420
340
Melting Completion (Liquidus), °C 1460
1610
Melting Onset (Solidus), °C 1420
1560
Specific Heat Capacity, J/kg-K 470
560
Thermal Conductivity, W/m-K 44
7.1
Thermal Expansion, µm/m-K 13
9.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.8
4.5
Embodied Carbon, kg CO2/kg material 1.5
43
Embodied Energy, MJ/kg 20
700
Embodied Water, L/kg 51
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 98
110
Resilience: Unit (Modulus of Resilience), kJ/m3 490 to 1050
4220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 23 to 27
62
Strength to Weight: Bending, points 21 to 24
50
Thermal Diffusivity, mm2/s 12
2.8
Thermal Shock Resistance, points 19 to 23
71

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.8
Carbon (C), % 0.22 to 0.29
0 to 0.080
Chromium (Cr), % 0.8 to 1.2
0
Hydrogen (H), % 0
0 to 0.013
Iron (Fe), % 96.8 to 98.3
0 to 0.4
Manganese (Mn), % 0.5 to 0.8
0
Molybdenum (Mo), % 0.15 to 0.3
0
Nickel (Ni), % 0
0.3 to 0.8
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.2
Palladium (Pd), % 0
0.040 to 0.080
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.6
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
86.7 to 90.6
Vanadium (V), % 0
3.5 to 4.5
Residuals, % 0
0 to 0.4