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S21900 Stainless Steel vs. SAE-AISI 1108 Steel

Both S21900 stainless steel and SAE-AISI 1108 steel are iron alloys. They have 64% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is S21900 stainless steel and the bottom bar is SAE-AISI 1108 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
110 to 140
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 50
23 to 34
Fatigue Strength, MPa 380
170 to 260
Poisson's Ratio 0.28
0.29
Reduction in Area, % 57
45 to 57
Shear Modulus, GPa 78
73
Shear Strength, MPa 510
250 to 280
Tensile Strength: Ultimate (UTS), MPa 710
380 to 440
Tensile Strength: Yield (Proof), MPa 390
220 to 360

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 980
400
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1350
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 14
52
Thermal Expansion, µm/m-K 17
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 15
1.8
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 3.0
1.4
Embodied Energy, MJ/kg 43
18
Embodied Water, L/kg 160
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
95 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 380
130 to 340
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 26
13 to 16
Strength to Weight: Bending, points 23
15 to 16
Thermal Diffusivity, mm2/s 3.8
14
Thermal Shock Resistance, points 15
12 to 14

Alloy Composition

Carbon (C), % 0 to 0.080
0.080 to 0.13
Chromium (Cr), % 19 to 21.5
0
Iron (Fe), % 59.4 to 67.4
98.9 to 99.24
Manganese (Mn), % 8.0 to 10
0.6 to 0.8
Nickel (Ni), % 5.5 to 7.5
0
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0.080 to 0.13