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EN 1.7725 Steel vs. SAE-AISI 1140 Steel

Both EN 1.7725 steel and SAE-AISI 1140 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 1.7725 steel and the bottom bar is SAE-AISI 1140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250 to 300
170 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14
14 to 18
Fatigue Strength, MPa 390 to 550
230 to 370
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Tensile Strength: Ultimate (UTS), MPa 830 to 1000
600 to 700
Tensile Strength: Yield (Proof), MPa 610 to 860
340 to 570

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
400
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
51
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.8
1.4
Embodied Energy, MJ/kg 24
18
Embodied Water, L/kg 54
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 130
89 to 93
Resilience: Unit (Modulus of Resilience), kJ/m3 980 to 1940
310 to 870
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29 to 35
21 to 25
Strength to Weight: Bending, points 25 to 28
20 to 22
Thermal Diffusivity, mm2/s 11
14
Thermal Shock Resistance, points 24 to 29
18 to 21

Alloy Composition

Carbon (C), % 0.27 to 0.34
0.37 to 0.44
Chromium (Cr), % 1.3 to 1.7
0
Iron (Fe), % 95.7 to 97.5
98.4 to 98.9
Manganese (Mn), % 0.6 to 1.0
0.7 to 1.0
Molybdenum (Mo), % 0.3 to 0.5
0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.6
0
Sulfur (S), % 0 to 0.030
0.080 to 0.13
Vanadium (V), % 0.050 to 0.15
0

Comparable Variants