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EN 1.3956 Stainless Steel vs. SAE-AISI 4140 Steel

Both EN 1.3956 stainless steel and SAE-AISI 4140 steel are iron alloys. They have 59% of their average alloy composition in common. There are 25 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 EN 1.3956 stainless steel and the bottom bar is SAE-AISI 4140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 27
11 to 26
Fatigue Strength, MPa 240
360 to 650
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
73
Tensile Strength: Ultimate (UTS), MPa 650
690 to 1080
Tensile Strength: Yield (Proof), MPa 330
590 to 990

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1080
420
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Base Metal Price, % relative 22
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.8
1.5
Embodied Energy, MJ/kg 68
20
Embodied Water, L/kg 180
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
74 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 270
920 to 2590
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 23
25 to 38
Strength to Weight: Bending, points 21
22 to 30
Thermal Shock Resistance, points 18
20 to 32

Alloy Composition

Carbon (C), % 0 to 0.060
0.38 to 0.43
Chromium (Cr), % 20.5 to 23.5
0.8 to 1.1
Iron (Fe), % 51.9 to 62.1
96.8 to 97.8
Manganese (Mn), % 4.0 to 6.0
0.75 to 1.0
Molybdenum (Mo), % 1.5 to 3.0
0.15 to 0.25
Nickel (Ni), % 11.5 to 13.5
0
Niobium (Nb), % 0.1 to 0.3
0
Nitrogen (N), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 0.1 to 0.3
0