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SAE-AISI 4340 Steel vs. EN 1.8550 Steel

Both SAE-AISI 4340 steel and EN 1.8550 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 (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340 steel and the bottom bar is EN 1.8550 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 360
300
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 22
11
Fatigue Strength, MPa 330 to 740
470
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 430 to 770
600
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
1000
Tensile Strength: Yield (Proof), MPa 470 to 1150
760

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 430
440
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
3.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
1.7
Embodied Energy, MJ/kg 22
23
Embodied Water, L/kg 53
67

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
100
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
1550
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 45
36
Strength to Weight: Bending, points 22 to 33
29
Thermal Diffusivity, mm2/s 12
11
Thermal Shock Resistance, points 20 to 38
29

Alloy Composition

Aluminum (Al), % 0
0.8 to 1.2
Carbon (C), % 0.38 to 0.43
0.3 to 0.37
Chromium (Cr), % 0.7 to 0.9
1.5 to 1.8
Iron (Fe), % 95.1 to 96.3
94.4 to 96.3
Manganese (Mn), % 0.6 to 0.8
0.4 to 0.7
Molybdenum (Mo), % 0.2 to 0.3
0.15 to 0.25
Nickel (Ni), % 1.7 to 2.0
0.85 to 1.2
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.040
0 to 0.035