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S21800 Stainless Steel vs. SAE-AISI 1108 Steel

Both S21800 stainless steel and SAE-AISI 1108 steel are iron alloys. They have 63% of their average alloy composition in common. There are 28 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 S21800 stainless steel and the bottom bar is SAE-AISI 1108 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
110 to 140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 40
23 to 34
Fatigue Strength, MPa 330
170 to 260
Poisson's Ratio 0.28
0.29
Reduction in Area, % 62
45 to 57
Shear Modulus, GPa 75
73
Shear Strength, MPa 510
250 to 280
Tensile Strength: Ultimate (UTS), MPa 740
380 to 440
Tensile Strength: Yield (Proof), MPa 390
220 to 360

Thermal Properties

Latent Heat of Fusion, J/g 340
250
Maximum Temperature: Mechanical, °C 900
400
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1310
1420
Specific Heat Capacity, J/kg-K 500
470
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 15
1.8
Density, g/cm3 7.5
7.9
Embodied Carbon, kg CO2/kg material 3.1
1.4
Embodied Energy, MJ/kg 45
18
Embodied Water, L/kg 150
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
95 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 390
130 to 340
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 27
13 to 16
Strength to Weight: Bending, points 24
15 to 16
Thermal Shock Resistance, points 17
12 to 14

Alloy Composition

Carbon (C), % 0 to 0.1
0.080 to 0.13
Chromium (Cr), % 16 to 18
0
Iron (Fe), % 59.1 to 65.4
98.9 to 99.24
Manganese (Mn), % 7.0 to 9.0
0.6 to 0.8
Nickel (Ni), % 8.0 to 9.0
0
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0 to 0.040
Silicon (Si), % 3.5 to 4.5
0
Sulfur (S), % 0 to 0.030
0.080 to 0.13