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S21800 Stainless Steel vs. SAE-AISI 8740 Steel

Both S21800 stainless steel and SAE-AISI 8740 steel are iron alloys. They have 65% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (8, 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 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
170 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 40
11 to 23
Fatigue Strength, MPa 330
270 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Shear Strength, MPa 510
370 to 400
Tensile Strength: Ultimate (UTS), MPa 740
580 to 670
Tensile Strength: Yield (Proof), MPa 390
380 to 570

Thermal Properties

Latent Heat of Fusion, J/g 340
250
Maximum Temperature: Mechanical, °C 900
410
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
13

Otherwise Unclassified Properties

Base Metal Price, % relative 15
2.6
Density, g/cm3 7.5
7.8
Embodied Carbon, kg CO2/kg material 3.1
1.5
Embodied Energy, MJ/kg 45
20
Embodied Water, L/kg 150
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 390
390 to 850
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 27
20 to 24
Strength to Weight: Bending, points 24
20 to 22
Thermal Shock Resistance, points 17
17 to 20

Alloy Composition

Carbon (C), % 0 to 0.1
0.38 to 0.43
Chromium (Cr), % 16 to 18
0.4 to 0.6
Iron (Fe), % 59.1 to 65.4
96.5 to 97.7
Manganese (Mn), % 7.0 to 9.0
0.75 to 1.0
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 8.0 to 9.0
0.4 to 0.7
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0 to 0.035
Silicon (Si), % 3.5 to 4.5
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040