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S81921 Stainless Steel vs. SAE-AISI 1108 Steel

Both S81921 stainless steel and SAE-AISI 1108 steel are iron alloys. They have 72% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is S81921 stainless steel and the bottom bar is SAE-AISI 1108 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260
110 to 140
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 29
23 to 34
Fatigue Strength, MPa 370
170 to 260
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
73
Shear Strength, MPa 460
250 to 280
Tensile Strength: Ultimate (UTS), MPa 710
380 to 440
Tensile Strength: Yield (Proof), MPa 500
220 to 360

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 990
400
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1390
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
52
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 14
1.8
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 2.9
1.4
Embodied Energy, MJ/kg 41
18
Embodied Water, L/kg 150
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
95 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 630
130 to 340
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25
13 to 16
Strength to Weight: Bending, points 23
15 to 16
Thermal Diffusivity, mm2/s 4.0
14
Thermal Shock Resistance, points 20
12 to 14

Alloy Composition

Carbon (C), % 0 to 0.030
0.080 to 0.13
Chromium (Cr), % 19 to 22
0
Iron (Fe), % 66.7 to 75.9
98.9 to 99.24
Manganese (Mn), % 2.0 to 4.0
0.6 to 0.8
Molybdenum (Mo), % 1.0 to 2.0
0
Nickel (Ni), % 2.0 to 4.0
0
Nitrogen (N), % 0.14 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0.080 to 0.13