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ASTM A387 Grade 91 Class 2 vs. Grade 350 Maraging Steel

Both ASTM A387 grade 91 class 2 and grade 350 maraging steel are iron alloys. They have 64% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 91 class 2 and the bottom bar is grade 350 maraging steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
4.1 to 18
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 75
75
Shear Strength, MPa 420
710 to 1400
Tensile Strength: Ultimate (UTS), MPa 670
1140 to 2420
Tensile Strength: Yield (Proof), MPa 470
830 to 2300

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
450
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
39
Density, g/cm3 7.8
8.2
Embodied Carbon, kg CO2/kg material 2.6
5.6
Embodied Energy, MJ/kg 37
74
Embodied Water, L/kg 88
160

Common Calculations

PREN (Pitting Resistance) 13
16
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
98 to 190
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 24
38 to 82
Strength to Weight: Bending, points 22
29 to 49
Thermal Shock Resistance, points 19
35 to 74

Alloy Composition

Aluminum (Al), % 0 to 0.020
0.050 to 0.15
Boron (B), % 0
0 to 0.0030
Calcium (Ca), % 0
0 to 0.050
Carbon (C), % 0.080 to 0.12
0 to 0.030
Chromium (Cr), % 8.0 to 9.5
0
Cobalt (Co), % 0
11.5 to 12.5
Iron (Fe), % 87.3 to 90.3
61.2 to 64.6
Manganese (Mn), % 0.3 to 0.6
0 to 0.1
Molybdenum (Mo), % 0.85 to 1.1
4.6 to 5.2
Nickel (Ni), % 0 to 0.4
18 to 19
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.020
0 to 0.010
Silicon (Si), % 0.2 to 0.5
0 to 0.1
Sulfur (S), % 0 to 0.010
0 to 0.010
Titanium (Ti), % 0 to 0.010
1.3 to 1.6
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0 to 0.020