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SAE-AISI 4140 Steel vs. EN 1.4986 Stainless Steel

Both SAE-AISI 4140 steel and EN 1.4986 stainless 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 SAE-AISI 4140 steel and the bottom bar is EN 1.4986 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 310
230
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 26
18
Fatigue Strength, MPa 360 to 650
350
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 410 to 660
460
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
750
Tensile Strength: Yield (Proof), MPa 590 to 990
560

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 420
940
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 43
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
25
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
4.8
Embodied Energy, MJ/kg 20
67
Embodied Water, L/kg 51
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
120
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
790
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25 to 38
26
Strength to Weight: Bending, points 22 to 30
23
Thermal Diffusivity, mm2/s 12
4.0
Thermal Shock Resistance, points 20 to 32
16

Alloy Composition

Boron (B), % 0
0.050 to 0.1
Carbon (C), % 0.38 to 0.43
0.040 to 0.1
Chromium (Cr), % 0.8 to 1.1
15.5 to 17.5
Iron (Fe), % 96.8 to 97.8
59.4 to 66.6
Manganese (Mn), % 0.75 to 1.0
0 to 1.5
Molybdenum (Mo), % 0.15 to 0.25
1.6 to 2.0
Nickel (Ni), % 0
15.5 to 17.5
Niobium (Nb), % 0
0.4 to 1.2
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0.15 to 0.35
0.3 to 0.6
Sulfur (S), % 0 to 0.040
0 to 0.030