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EN 1.7779 Steel vs. SAE-AISI 8740 Steel

Both EN 1.7779 steel and SAE-AISI 8740 steel are iron alloys. They have a very high 96% 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 EN 1.7779 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 190
190
Elongation at Break, % 16
11 to 23
Fatigue Strength, MPa 430
270 to 350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 500
370 to 400
Tensile Strength: Ultimate (UTS), MPa 810
580 to 670
Tensile Strength: Yield (Proof), MPa 660
380 to 570

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 470
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 39
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.8
1.5
Embodied Energy, MJ/kg 41
20
Embodied Water, L/kg 64
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 1150
390 to 850
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
20 to 24
Strength to Weight: Bending, points 25
20 to 22
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 23
17 to 20

Alloy Composition

Aluminum (Al), % 0 to 0.040
0
Carbon (C), % 0.17 to 0.23
0.38 to 0.43
Chromium (Cr), % 3.0 to 3.3
0.4 to 0.6
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 93.8 to 95.4
96.5 to 97.7
Manganese (Mn), % 0.3 to 0.5
0.75 to 1.0
Molybdenum (Mo), % 0.5 to 0.6
0.2 to 0.3
Nickel (Ni), % 0 to 0.3
0.4 to 0.7
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0.15 to 0.35
Sulfur (S), % 0 to 0.010
0 to 0.040
Vanadium (V), % 0.45 to 0.55
0