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EN 1.8550 Steel vs. SAE-AISI 4145 Steel

Both EN 1.8550 steel and SAE-AISI 4145 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 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 1.8550 steel and the bottom bar is SAE-AISI 4145 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
310
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
16
Fatigue Strength, MPa 470
240
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 600
360
Tensile Strength: Ultimate (UTS), MPa 1000
580
Tensile Strength: Yield (Proof), MPa 760
360

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 440
420
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 40
42
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
1.5
Embodied Energy, MJ/kg 23
20
Embodied Water, L/kg 67
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
80
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
350
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 36
21
Strength to Weight: Bending, points 29
20
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 29
17

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0
Carbon (C), % 0.3 to 0.37
0.43 to 0.48
Chromium (Cr), % 1.5 to 1.8
0.8 to 1.1
Iron (Fe), % 94.4 to 96.3
96.7 to 97.7
Manganese (Mn), % 0.4 to 0.7
0.75 to 1.0
Molybdenum (Mo), % 0.15 to 0.25
0.15 to 0.25
Nickel (Ni), % 0.85 to 1.2
0
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.035
0 to 0.040