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S21900 Stainless Steel vs. SAE-AISI 5140 Steel

Both S21900 stainless steel and SAE-AISI 5140 steel are iron alloys. They have 65% 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 S21900 stainless steel and the bottom bar is SAE-AISI 5140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
170 to 290
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 50
12 to 29
Fatigue Strength, MPa 380
220 to 570
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Shear Strength, MPa 510
360 to 600
Tensile Strength: Ultimate (UTS), MPa 710
560 to 970
Tensile Strength: Yield (Proof), MPa 390
290 to 840

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 980
420
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
45
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 15
2.1
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.0
1.4
Embodied Energy, MJ/kg 43
19
Embodied Water, L/kg 160
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
76 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 380
220 to 1880
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 26
20 to 34
Strength to Weight: Bending, points 23
19 to 28
Thermal Diffusivity, mm2/s 3.8
12
Thermal Shock Resistance, points 15
16 to 29

Alloy Composition

Carbon (C), % 0 to 0.080
0.38 to 0.43
Chromium (Cr), % 19 to 21.5
0.7 to 0.9
Iron (Fe), % 59.4 to 67.4
97.3 to 98.1
Manganese (Mn), % 8.0 to 10
0.7 to 0.9
Nickel (Ni), % 5.5 to 7.5
0
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040