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SAE-AISI 8740 Steel vs. EN 1.7725 Steel

Both SAE-AISI 8740 steel and EN 1.7725 steel are iron alloys. They have a very high 99% 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 SAE-AISI 8740 steel and the bottom bar is EN 1.7725 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 200
250 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 23
14
Fatigue Strength, MPa 270 to 350
390 to 550
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 580 to 670
830 to 1000
Tensile Strength: Yield (Proof), MPa 380 to 570
610 to 860

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
440
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 7.3
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
2.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.8
Embodied Energy, MJ/kg 20
24
Embodied Water, L/kg 50
54

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
110 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 390 to 850
980 to 1940
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20 to 24
29 to 35
Strength to Weight: Bending, points 20 to 22
25 to 28
Thermal Diffusivity, mm2/s 10
11
Thermal Shock Resistance, points 17 to 20
24 to 29

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.27 to 0.34
Chromium (Cr), % 0.4 to 0.6
1.3 to 1.7
Iron (Fe), % 96.5 to 97.7
95.7 to 97.5
Manganese (Mn), % 0.75 to 1.0
0.6 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
0.3 to 0.5
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
Vanadium (V), % 0
0.050 to 0.15

Comparable Variants