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AWS ERTi-7 vs. ASTM A387 Grade 91 Class 2

AWS ERTi-7 belongs to the titanium alloys classification, while ASTM A387 grade 91 class 2 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 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
190
Elongation at Break, % 20
20
Fatigue Strength, MPa 190
330
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 40
75
Tensile Strength: Ultimate (UTS), MPa 340
670
Tensile Strength: Yield (Proof), MPa 280
470

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
1420
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
8.9
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
2.6
Embodied Energy, MJ/kg 800
37
Embodied Water, L/kg 470
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 64
120
Resilience: Unit (Modulus of Resilience), kJ/m3 360
580
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 21
24
Strength to Weight: Bending, points 24
22
Thermal Diffusivity, mm2/s 8.8
6.9
Thermal Shock Resistance, points 26
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.030
0.080 to 0.12
Chromium (Cr), % 0
8.0 to 9.5
Hydrogen (H), % 0 to 0.0080
0
Iron (Fe), % 0 to 0.12
87.3 to 90.3
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0 to 0.015
0.030 to 0.070
Oxygen (O), % 0.080 to 0.16
0
Palladium (Pd), % 0.12 to 0.25
0
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0
0.2 to 0.5
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 99.417 to 99.8
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010