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AWS ERTi-7 vs. ASTM A387 Grade 9 Steel

AWS ERTi-7 belongs to the titanium alloys classification, while ASTM A387 grade 9 steel belongs to the iron alloys. There are 28 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 AWS ERTi-7 and the bottom bar is ASTM A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
190
Elongation at Break, % 20
20 to 21
Fatigue Strength, MPa 190
160 to 240
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 40
75
Tensile Strength: Ultimate (UTS), MPa 340
500 to 600
Tensile Strength: Yield (Proof), MPa 280
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 420
270
Maximum Temperature: Mechanical, °C 320
600
Melting Completion (Liquidus), °C 1670
1460
Melting Onset (Solidus), °C 1620
1410
Specific Heat Capacity, J/kg-K 540
470
Thermal Conductivity, W/m-K 21
26
Thermal Expansion, µm/m-K 8.7
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 7.3
10

Otherwise Unclassified Properties

Density, g/cm3 4.5
7.8
Embodied Carbon, kg CO2/kg material 47
2.1
Embodied Energy, MJ/kg 800
28
Embodied Water, L/kg 470
87

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 64
83 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 360
140 to 310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 21
18 to 21
Strength to Weight: Bending, points 24
18 to 20
Thermal Diffusivity, mm2/s 8.8
6.9
Thermal Shock Resistance, points 26
14 to 17

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.15
Chromium (Cr), % 0
8.0 to 10
Hydrogen (H), % 0 to 0.0080
0
Iron (Fe), % 0 to 0.12
87.1 to 90.8
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nitrogen (N), % 0 to 0.015
0
Oxygen (O), % 0.080 to 0.16
0
Palladium (Pd), % 0.12 to 0.25
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.025
Titanium (Ti), % 99.417 to 99.8
0
Vanadium (V), % 0
0 to 0.040