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EN 1.7221 Steel vs. Titanium 6-7

EN 1.7221 steel belongs to the iron alloys classification, while titanium 6-7 belongs to the titanium alloys. There are 25 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is EN 1.7221 steel and the bottom bar is titanium 6-7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
120
Elongation at Break, % 11 to 17
11
Fatigue Strength, MPa 290 to 390
530
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
45
Tensile Strength: Ultimate (UTS), MPa 650 to 780
1020
Tensile Strength: Yield (Proof), MPa 430 to 630
900

Thermal Properties

Latent Heat of Fusion, J/g 250
410
Maximum Temperature: Mechanical, °C 420
300
Melting Completion (Liquidus), °C 1460
1700
Melting Onset (Solidus), °C 1420
1650
Specific Heat Capacity, J/kg-K 470
520
Thermal Expansion, µm/m-K 13
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
75
Density, g/cm3 7.8
5.1
Embodied Carbon, kg CO2/kg material 1.5
34
Embodied Energy, MJ/kg 20
540
Embodied Water, L/kg 51
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 98
110
Resilience: Unit (Modulus of Resilience), kJ/m3 490 to 1050
3460
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
32
Strength to Weight: Axial, points 23 to 27
56
Strength to Weight: Bending, points 21 to 24
44
Thermal Shock Resistance, points 19 to 23
66

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.5
Carbon (C), % 0.22 to 0.29
0 to 0.080
Chromium (Cr), % 0.8 to 1.2
0
Hydrogen (H), % 0
0 to 0.0090
Iron (Fe), % 96.8 to 98.3
0 to 0.25
Manganese (Mn), % 0.5 to 0.8
0
Molybdenum (Mo), % 0.15 to 0.3
6.5 to 7.5
Niobium (Nb), % 0
6.5 to 7.5
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.6
0
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0
84.9 to 88