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EN 1.6587 Steel vs. SAE-AISI 4340 Steel

Both EN 1.6587 steel and SAE-AISI 4340 steel are iron alloys. Their average alloy composition is basically identical. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is EN 1.6587 steel and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 220
210 to 360
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 520 to 1420
690 to 1280

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
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 41
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 3.8
3.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.7
1.7
Embodied Energy, MJ/kg 22
22
Embodied Water, L/kg 58
53

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 50
24 to 45
Strength to Weight: Bending, points 18 to 36
22 to 33
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 15 to 42
20 to 38

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Carbon (C), % 0.15 to 0.21
0.38 to 0.43
Chromium (Cr), % 1.5 to 1.8
0.7 to 0.9
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 94.4 to 96.4
95.1 to 96.3
Manganese (Mn), % 0.5 to 0.9
0.6 to 0.8
Molybdenum (Mo), % 0.25 to 0.35
0.2 to 0.3
Nickel (Ni), % 1.4 to 1.7
1.7 to 2.0
Oxygen (O), % 0 to 0.0020
0
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040

Comparable Variants