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EN 1.7231 Steel vs. SAE-AISI 4161 Steel

Both EN 1.7231 steel and SAE-AISI 4161 steel are iron alloys. Their average alloy composition is basically identical. There are 30 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 1.7231 steel and the bottom bar is SAE-AISI 4161 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240 to 280
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 12
20
Fatigue Strength, MPa 360 to 500
290
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 790 to 930
680
Tensile Strength: Yield (Proof), MPa 570 to 800
410

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 46
43
Thermal Expansion, µm/m-K 13
12

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 2.5
2.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 20
20
Embodied Water, L/kg 51
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 100
120
Resilience: Unit (Modulus of Resilience), kJ/m3 870 to 1700
460
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 28 to 33
24
Strength to Weight: Bending, points 24 to 27
22
Thermal Diffusivity, mm2/s 12
12
Thermal Shock Resistance, points 23 to 27
22

Alloy Composition

Carbon (C), % 0.38 to 0.45
0.56 to 0.64
Chromium (Cr), % 0.8 to 1.2
0.7 to 0.9
Iron (Fe), % 96.4 to 98.1
96.7 to 97.6
Manganese (Mn), % 0.6 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0.15 to 0.3
0.25 to 0.35
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 0.6
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040