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SAE-AISI 8740 Steel vs. EN 1.7715 Steel

Both SAE-AISI 8740 steel and EN 1.7715 steel are iron alloys. They have a very high 99% of their average alloy composition in common. There are 31 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 1.7715 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 200
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 23
21
Fatigue Strength, MPa 270 to 350
240
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 370 to 400
340
Tensile Strength: Ultimate (UTS), MPa 580 to 670
540
Tensile Strength: Yield (Proof), MPa 380 to 570
340

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
420
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
40
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
2.9
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
2.2
Embodied Energy, MJ/kg 20
30
Embodied Water, L/kg 50
52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
99
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
320
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20 to 24
19
Strength to Weight: Bending, points 20 to 22
19
Thermal Diffusivity, mm2/s 10
11
Thermal Shock Resistance, points 17 to 20
16

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Carbon (C), % 0.38 to 0.43
0.1 to 0.15
Chromium (Cr), % 0.4 to 0.6
0.3 to 0.6
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 96.5 to 97.7
96.5 to 98.3
Manganese (Mn), % 0.75 to 1.0
0.4 to 0.7
Molybdenum (Mo), % 0.2 to 0.3
0.5 to 0.7
Nickel (Ni), % 0.4 to 0.7
0 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.010
Vanadium (V), % 0
0.22 to 0.28