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ASTM A387 Grade 9 Steel vs. Titanium 6-7

ASTM A387 grade 9 steel belongs to the iron alloys classification, while titanium 6-7 belongs to the titanium alloys. There are 26 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 9 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, % 20 to 21
11
Fatigue Strength, MPa 160 to 240
530
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 75
45
Shear Strength, MPa 310 to 380
610
Tensile Strength: Ultimate (UTS), MPa 500 to 600
1020
Tensile Strength: Yield (Proof), MPa 230 to 350
900

Thermal Properties

Latent Heat of Fusion, J/g 270
410
Maximum Temperature: Mechanical, °C 600
300
Melting Completion (Liquidus), °C 1460
1700
Melting Onset (Solidus), °C 1410
1650
Specific Heat Capacity, J/kg-K 470
520
Thermal Expansion, µm/m-K 13
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
75
Density, g/cm3 7.8
5.1
Embodied Carbon, kg CO2/kg material 2.1
34
Embodied Energy, MJ/kg 28
540
Embodied Water, L/kg 87
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
110
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
3460
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
32
Strength to Weight: Axial, points 18 to 21
56
Strength to Weight: Bending, points 18 to 20
44
Thermal Shock Resistance, points 14 to 17
66

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.5
Carbon (C), % 0 to 0.15
0 to 0.080
Chromium (Cr), % 8.0 to 10
0
Hydrogen (H), % 0
0 to 0.0090
Iron (Fe), % 87.1 to 90.8
0 to 0.25
Manganese (Mn), % 0.3 to 0.6
0
Molybdenum (Mo), % 0.9 to 1.1
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 1.0
0
Sulfur (S), % 0 to 0.025
0
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0
84.9 to 88
Vanadium (V), % 0 to 0.040
0