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EN 1.4986 Stainless Steel vs. SAE-AISI 4140 Steel

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

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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