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S31730 Stainless Steel vs. SAE-AISI 8620 Steel

Both S31730 stainless steel and SAE-AISI 8620 steel are iron alloys. They have 59% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is S31730 stainless steel and the bottom bar is SAE-AISI 8620 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
150 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40
13 to 31
Fatigue Strength, MPa 170
270 to 360
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 370
340 to 420
Tensile Strength: Ultimate (UTS), MPa 540
520 to 690
Tensile Strength: Yield (Proof), MPa 200
360 to 570

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 990
410
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1390
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 24
2.6
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 4.6
1.5
Embodied Energy, MJ/kg 63
20
Embodied Water, L/kg 180
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
86 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 99
340 to 880
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
18 to 24
Strength to Weight: Bending, points 18
18 to 22
Thermal Shock Resistance, points 12
15 to 20

Alloy Composition

Carbon (C), % 0 to 0.030
0.18 to 0.23
Chromium (Cr), % 17 to 19
0.4 to 0.6
Copper (Cu), % 4.0 to 5.0
0
Iron (Fe), % 52.4 to 61
96.9 to 98
Manganese (Mn), % 0 to 2.0
0.7 to 0.9
Molybdenum (Mo), % 3.0 to 4.0
0.15 to 0.25
Nickel (Ni), % 15 to 16.5
0.4 to 0.7
Nitrogen (N), % 0 to 0.045
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.010
0 to 0.040