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SAE-AISI 8620 Steel vs. R30556 Alloy

Both SAE-AISI 8620 steel and R30556 alloy are iron alloys. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8620 steel and the bottom bar is R30556 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 13 to 31
45
Fatigue Strength, MPa 270 to 360
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
81
Shear Strength, MPa 340 to 420
550
Tensile Strength: Ultimate (UTS), MPa 520 to 690
780
Tensile Strength: Yield (Proof), MPa 360 to 570
350

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1330
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 39
11
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
70
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.5
8.7
Embodied Energy, MJ/kg 20
130
Embodied Water, L/kg 50
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 86 to 150
290
Resilience: Unit (Modulus of Resilience), kJ/m3 340 to 880
290
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 18 to 24
26
Strength to Weight: Bending, points 18 to 22
22
Thermal Diffusivity, mm2/s 10
2.9
Thermal Shock Resistance, points 15 to 20
18

Alloy Composition

Aluminum (Al), % 0
0.1 to 0.5
Boron (B), % 0
0 to 0.020
Carbon (C), % 0.18 to 0.23
0.050 to 0.15
Chromium (Cr), % 0.4 to 0.6
21 to 23
Cobalt (Co), % 0
16 to 21
Iron (Fe), % 96.9 to 98
20.4 to 38.2
Lanthanum (La), % 0
0.0050 to 0.1
Manganese (Mn), % 0.7 to 0.9
0.5 to 2.0
Molybdenum (Mo), % 0.15 to 0.25
2.5 to 4.0
Nickel (Ni), % 0.4 to 0.7
19 to 22.5
Niobium (Nb), % 0
0 to 0.3
Nitrogen (N), % 0
0.1 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0.2 to 0.8
Sulfur (S), % 0 to 0.040
0 to 0.015
Tantalum (Ta), % 0
0.3 to 1.3
Tungsten (W), % 0
2.0 to 3.5
Zinc (Zn), % 0
0.0010 to 0.1