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SAE-AISI 4140 Steel vs. S21600 Stainless Steel

Both SAE-AISI 4140 steel and S21600 stainless 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 SAE-AISI 4140 steel and the bottom bar is S21600 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 310
200
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 26
46
Fatigue Strength, MPa 360 to 650
360
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
79
Shear Strength, MPa 410 to 660
500
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
710
Tensile Strength: Yield (Proof), MPa 590 to 990
390

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 420
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 13
17

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.5
3.6
Embodied Energy, MJ/kg 20
50
Embodied Water, L/kg 51
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
270
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
370
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 38
25
Strength to Weight: Bending, points 22 to 30
23
Thermal Shock Resistance, points 20 to 32
15

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.080
Chromium (Cr), % 0.8 to 1.1
17.5 to 22
Iron (Fe), % 96.8 to 97.8
57.6 to 67.8
Manganese (Mn), % 0.75 to 1.0
7.5 to 9.0
Molybdenum (Mo), % 0.15 to 0.25
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 0.035
0 to 0.045
Silicon (Si), % 0.15 to 0.35
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030