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SAE-AISI 1018 Steel vs. S21904 Stainless Steel

Both SAE-AISI 1018 steel and S21904 stainless steel are iron alloys. They have 64% 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 SAE-AISI 1018 steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 130 to 140
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 17 to 27
17 to 51
Fatigue Strength, MPa 180 to 270
380 to 550
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Shear Strength, MPa 280 to 300
510 to 620
Tensile Strength: Ultimate (UTS), MPa 430 to 480
700 to 1000
Tensile Strength: Yield (Proof), MPa 240 to 400
390 to 910

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 75 to 100
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 430
380 to 2070
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 15 to 17
25 to 36
Strength to Weight: Bending, points 16 to 17
23 to 29
Thermal Diffusivity, mm2/s 14
3.8
Thermal Shock Resistance, points 14 to 15
15 to 21

Alloy Composition

Carbon (C), % 0.15 to 0.2
0 to 0.040
Chromium (Cr), % 0
19 to 21.5
Iron (Fe), % 98.8 to 99.25
59.5 to 67.4
Manganese (Mn), % 0.6 to 0.9
8.0 to 10
Nickel (Ni), % 0
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0 to 0.050
0 to 0.030