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S31100 Stainless Steel vs. SAE-AISI 8645 Steel

Both S31100 stainless steel and SAE-AISI 8645 steel are iron alloys. They have 68% of their average alloy composition in common. There are 31 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 S31100 stainless steel and the bottom bar is SAE-AISI 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270
180 to 200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 4.5
12 to 23
Fatigue Strength, MPa 330
280 to 350
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
73
Shear Strength, MPa 580
380 to 400
Tensile Strength: Ultimate (UTS), MPa 1000
600 to 670
Tensile Strength: Yield (Proof), MPa 710
390 to 560

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
410
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 16
2.6
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.1
1.5
Embodied Energy, MJ/kg 44
20
Embodied Water, L/kg 170
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 40
77 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 1240
420 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 36
21 to 24
Strength to Weight: Bending, points 29
20 to 22
Thermal Diffusivity, mm2/s 4.2
10
Thermal Shock Resistance, points 28
18 to 20

Alloy Composition

Carbon (C), % 0 to 0.060
0.43 to 0.48
Chromium (Cr), % 25 to 27
0.4 to 0.6
Iron (Fe), % 63.6 to 69
96.5 to 97.7
Manganese (Mn), % 0 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 6.0 to 7.0
0.4 to 0.7
Phosphorus (P), % 0 to 0.045
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Titanium (Ti), % 0 to 0.25
0