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SAE-AISI 8645 Steel vs. Grade 350 Maraging Steel

Both SAE-AISI 8645 steel and grade 350 maraging steel are iron alloys. They have 64% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8645 steel 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, % 12 to 23
4.1 to 18
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 73
75
Shear Strength, MPa 380 to 400
710 to 1400
Tensile Strength: Ultimate (UTS), MPa 600 to 670
1140 to 2420
Tensile Strength: Yield (Proof), MPa 390 to 560
830 to 2300

Thermal Properties

Latent Heat of Fusion, J/g 250
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 2.6
39
Density, g/cm3 7.8
8.2
Embodied Carbon, kg CO2/kg material 1.5
5.6
Embodied Energy, MJ/kg 20
74
Embodied Water, L/kg 50
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
98 to 190
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 21 to 24
38 to 82
Strength to Weight: Bending, points 20 to 22
29 to 49
Thermal Shock Resistance, points 18 to 20
35 to 74

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), % 0.43 to 0.48
0 to 0.030
Chromium (Cr), % 0.4 to 0.6
0
Cobalt (Co), % 0
11.5 to 12.5
Iron (Fe), % 96.5 to 97.7
61.2 to 64.6
Manganese (Mn), % 0.75 to 1.0
0 to 0.1
Molybdenum (Mo), % 0.15 to 0.25
4.6 to 5.2
Nickel (Ni), % 0.4 to 0.7
18 to 19
Phosphorus (P), % 0 to 0.035
0 to 0.010
Silicon (Si), % 0.15 to 0.35
0 to 0.1
Sulfur (S), % 0 to 0.040
0 to 0.010
Titanium (Ti), % 0
1.3 to 1.6
Zirconium (Zr), % 0
0 to 0.020

Comparable Variants