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SAE-AISI 8740 Steel vs. EN 1.7230 Steel

Both SAE-AISI 8740 steel and EN 1.7230 steel are iron alloys. Their average alloy composition is basically identical. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is EN 1.7230 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 200
220 to 270
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 23
11 to 12
Fatigue Strength, MPa 270 to 350
320 to 460
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 580 to 670
720 to 910
Tensile Strength: Yield (Proof), MPa 380 to 570
510 to 740

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
420
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 39
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 20
20
Embodied Water, L/kg 50
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
79 to 97
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
700 to 1460
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20 to 24
26 to 32
Strength to Weight: Bending, points 20 to 22
23 to 27
Thermal Diffusivity, mm2/s 10
12
Thermal Shock Resistance, points 17 to 20
21 to 27

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.3 to 0.37
Chromium (Cr), % 0.4 to 0.6
0.8 to 1.2
Iron (Fe), % 96.5 to 97.7
96.7 to 98.3
Manganese (Mn), % 0.75 to 1.0
0.5 to 0.8
Molybdenum (Mo), % 0.2 to 0.3
0.15 to 0.3
Nickel (Ni), % 0.4 to 0.7
0
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.6
Sulfur (S), % 0 to 0.040
0 to 0.030

Comparable Variants