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SAE-AISI 4140 Steel vs. EN 1.4542 Stainless Steel

Both SAE-AISI 4140 steel and EN 1.4542 stainless steel are iron alloys. They have 77% of their average alloy composition in common. There are 30 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 1.4542 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 26
5.7 to 20
Fatigue Strength, MPa 360 to 650
370 to 640
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Shear Strength, MPa 410 to 660
550 to 860
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
880 to 1470
Tensile Strength: Yield (Proof), MPa 590 to 990
580 to 1300

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 420
860
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 43
16
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
13
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.7
Embodied Energy, MJ/kg 20
39
Embodied Water, L/kg 51
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
62 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
880 to 4360
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 25 to 38
31 to 52
Strength to Weight: Bending, points 22 to 30
26 to 37
Thermal Diffusivity, mm2/s 12
4.3
Thermal Shock Resistance, points 20 to 32
29 to 49

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.070
Chromium (Cr), % 0.8 to 1.1
15 to 17
Copper (Cu), % 0
3.0 to 5.0
Iron (Fe), % 96.8 to 97.8
69.6 to 79
Manganese (Mn), % 0.75 to 1.0
0 to 1.5
Molybdenum (Mo), % 0.15 to 0.25
0 to 0.6
Nickel (Ni), % 0
3.0 to 5.0
Niobium (Nb), % 0
0 to 0.45
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 0.7
Sulfur (S), % 0 to 0.040
0 to 0.015