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SAE-AISI 1018 Steel vs. S21603 Stainless Steel

Both SAE-AISI 1018 steel and S21603 stainless steel are iron alloys. They have 64% 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 SAE-AISI 1018 steel and the bottom bar is S21603 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 130 to 140
200
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 17 to 27
45
Fatigue Strength, MPa 180 to 270
360
Poisson's Ratio 0.29
0.28
Reduction in Area, % 45 to 57
57
Shear Modulus, GPa 73
79
Shear Strength, MPa 280 to 300
490
Tensile Strength: Ultimate (UTS), MPa 430 to 480
690
Tensile Strength: Yield (Proof), MPa 240 to 400
390

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 400
990
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
17
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.4
3.6
Embodied Energy, MJ/kg 18
50
Embodied Water, L/kg 46
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 75 to 100
270
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 430
380
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 15 to 17
25
Strength to Weight: Bending, points 16 to 17
22
Thermal Shock Resistance, points 14 to 15
15

Alloy Composition

Carbon (C), % 0.15 to 0.2
0 to 0.030
Chromium (Cr), % 0
17.5 to 22
Iron (Fe), % 98.8 to 99.25
57.6 to 67.8
Manganese (Mn), % 0.6 to 0.9
7.5 to 9.0
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
5.0 to 7.0
Nitrogen (N), % 0
0.25 to 0.5
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0
0 to 0.75
Sulfur (S), % 0 to 0.050
0 to 0.030