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AWS ERTi-7 vs. Grade 250 Maraging Steel

AWS ERTi-7 belongs to the titanium alloys classification, while grade 250 maraging steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is AWS ERTi-7 and the bottom bar is grade 250 maraging steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
190
Elongation at Break, % 20
7.3 to 17
Poisson's Ratio 0.32
0.3
Shear Modulus, GPa 40
75
Tensile Strength: Ultimate (UTS), MPa 340
970 to 1800
Tensile Strength: Yield (Proof), MPa 280
660 to 1740

Thermal Properties

Latent Heat of Fusion, J/g 420
270
Melting Completion (Liquidus), °C 1670
1480
Melting Onset (Solidus), °C 1620
1430
Specific Heat Capacity, J/kg-K 540
450
Thermal Expansion, µm/m-K 8.7
12

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.2
Embodied Carbon, kg CO2/kg material 47
4.9
Embodied Energy, MJ/kg 800
65
Embodied Water, L/kg 470
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 64
130 to 150
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
23
Strength to Weight: Axial, points 21
33 to 61
Strength to Weight: Bending, points 24
26 to 40
Thermal Shock Resistance, points 26
29 to 54

Alloy Composition

Aluminum (Al), % 0
0.050 to 0.15
Boron (B), % 0
0 to 0.0030
Calcium (Ca), % 0
0 to 0.050
Carbon (C), % 0 to 0.030
0 to 0.030
Cobalt (Co), % 0
7.0 to 8.5
Hydrogen (H), % 0 to 0.0080
0
Iron (Fe), % 0 to 0.12
66.3 to 71.1
Manganese (Mn), % 0
0 to 0.1
Molybdenum (Mo), % 0
4.6 to 5.2
Nickel (Ni), % 0
17 to 19
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 0.010
Silicon (Si), % 0
0 to 0.1
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 99.417 to 99.8
0.3 to 0.5
Zirconium (Zr), % 0
0 to 0.020