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S21904 Stainless Steel vs. SAE-AISI 4118 Steel

Both S21904 stainless steel and SAE-AISI 4118 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 (2, in this case) are not shown.

For each property being compared, the top bar is S21904 stainless steel and the bottom bar is SAE-AISI 4118 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
150
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17 to 51
23
Fatigue Strength, MPa 380 to 550
230
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Shear Strength, MPa 510 to 620
320
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
500
Tensile Strength: Yield (Proof), MPa 390 to 910
320

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 980
410
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
46
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
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 15
2.3
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.0
1.5
Embodied Energy, MJ/kg 43
20
Embodied Water, L/kg 160
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
100
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
280
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25 to 36
18
Strength to Weight: Bending, points 23 to 29
18
Thermal Diffusivity, mm2/s 3.8
13
Thermal Shock Resistance, points 15 to 21
15

Alloy Composition

Carbon (C), % 0 to 0.040
0.18 to 0.23
Chromium (Cr), % 19 to 21.5
0.4 to 0.6
Iron (Fe), % 59.5 to 67.4
97.5 to 98.4
Manganese (Mn), % 8.0 to 10
0.7 to 0.9
Molybdenum (Mo), % 0
0.2 to 0.3
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