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EN 1.4931 Steel vs. SAE-AISI 4340 Steel

Both EN 1.4931 steel and SAE-AISI 4340 steel are iron alloys. They have 88% 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 EN 1.4931 steel and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
210 to 360
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
12 to 22
Fatigue Strength, MPa 410
330 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 810
690 to 1280
Tensile Strength: Yield (Proof), MPa 620
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 600
430
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 24
44
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.8
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 11
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
3.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.9
1.7
Embodied Energy, MJ/kg 42
22
Embodied Water, L/kg 100
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 970
590 to 3490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 29
24 to 45
Strength to Weight: Bending, points 25
22 to 33
Thermal Diffusivity, mm2/s 6.5
12
Thermal Shock Resistance, points 22
20 to 38

Alloy Composition

Carbon (C), % 0.2 to 0.26
0.38 to 0.43
Chromium (Cr), % 11.3 to 12.2
0.7 to 0.9
Iron (Fe), % 83.2 to 86.8
95.1 to 96.3
Manganese (Mn), % 0.5 to 0.8
0.6 to 0.8
Molybdenum (Mo), % 1.0 to 1.2
0.2 to 0.3
Nickel (Ni), % 0 to 1.0
1.7 to 2.0
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.040
Tungsten (W), % 0 to 0.5
0
Vanadium (V), % 0.25 to 0.35
0