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EN 1.4931 Steel vs. SAE-AISI 8740 Steel

Both EN 1.4931 steel and SAE-AISI 8740 steel are iron alloys. They have 87% 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 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
170 to 200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
11 to 23
Fatigue Strength, MPa 410
270 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 810
580 to 670
Tensile Strength: Yield (Proof), MPa 620
380 to 570

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 600
410
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
39
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.8
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 11
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.9
1.5
Embodied Energy, MJ/kg 42
20
Embodied Water, L/kg 100
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 970
390 to 850
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 29
20 to 24
Strength to Weight: Bending, points 25
20 to 22
Thermal Diffusivity, mm2/s 6.5
10
Thermal Shock Resistance, points 22
17 to 20

Alloy Composition

Carbon (C), % 0.2 to 0.26
0.38 to 0.43
Chromium (Cr), % 11.3 to 12.2
0.4 to 0.6
Iron (Fe), % 83.2 to 86.8
96.5 to 97.7
Manganese (Mn), % 0.5 to 0.8
0.75 to 1.0
Molybdenum (Mo), % 1.0 to 1.2
0.2 to 0.3
Nickel (Ni), % 0 to 1.0
0.4 to 0.7
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