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SAE-AISI 4140 Steel vs. EN 1.4971 Stainless Steel

Both SAE-AISI 4140 steel and EN 1.4971 stainless steel are iron alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 material properties with values for both materials. Properties with values for just one material (4, 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 1.4971 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 310
240
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 11 to 26
34
Fatigue Strength, MPa 360 to 650
270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
81
Shear Strength, MPa 410 to 660
530
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
800
Tensile Strength: Yield (Proof), MPa 590 to 990
340

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 420
1100
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 43
13
Thermal Expansion, µm/m-K 13
15

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
70
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.5
7.6
Embodied Energy, MJ/kg 20
110
Embodied Water, L/kg 51
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
220
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
280
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
3.4
Thermal Shock Resistance, points 20 to 32
19

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.080 to 0.16
Chromium (Cr), % 0.8 to 1.1
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 96.8 to 97.8
24.3 to 37.1
Manganese (Mn), % 0.75 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.15 to 0.25
2.5 to 3.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0.1 to 0.2
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.015
Tungsten (W), % 0
2.0 to 3.0