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EN 1.7221 Steel vs. Grade 7 Titanium

EN 1.7221 steel belongs to the iron alloys classification, while grade 7 titanium belongs to the titanium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (4, 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 7 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 230
150
Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 11 to 17
24
Fatigue Strength, MPa 290 to 390
250
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
38
Tensile Strength: Ultimate (UTS), MPa 650 to 780
420
Tensile Strength: Yield (Proof), MPa 430 to 630
340

Thermal Properties

Latent Heat of Fusion, J/g 250
420
Maximum Temperature: Mechanical, °C 420
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 44
22
Thermal Expansion, µm/m-K 13
9.2

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
7.2

Otherwise Unclassified Properties

Density, g/cm3 7.8
4.5
Embodied Carbon, kg CO2/kg material 1.5
47
Embodied Energy, MJ/kg 20
800
Embodied Water, L/kg 51
470

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 98
95
Resilience: Unit (Modulus of Resilience), kJ/m3 490 to 1050
560
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
35
Strength to Weight: Axial, points 23 to 27
26
Strength to Weight: Bending, points 21 to 24
28
Thermal Diffusivity, mm2/s 12
8.9
Thermal Shock Resistance, points 19 to 23
31

Alloy Composition

Carbon (C), % 0.22 to 0.29
0 to 0.080
Chromium (Cr), % 0.8 to 1.2
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 96.8 to 98.3
0 to 0.3
Manganese (Mn), % 0.5 to 0.8
0
Molybdenum (Mo), % 0.15 to 0.3
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.25
Palladium (Pd), % 0
0.12 to 0.25
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.6
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
98.7 to 99.88
Residuals, % 0
0 to 0.4