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SAE-AISI 4340 Steel vs. EN 1.8936 Steel

Both SAE-AISI 4340 steel and EN 1.8936 steel are iron alloys. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI 4340 steel and the bottom bar is EN 1.8936 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 360
180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 22
20
Fatigue Strength, MPa 330 to 740
250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 430 to 770
370
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
600
Tensile Strength: Yield (Proof), MPa 470 to 1150
370

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 430
410
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 44
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
2.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
1.7
Embodied Energy, MJ/kg 22
24
Embodied Water, L/kg 53
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
100
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
370
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 45
21
Strength to Weight: Bending, points 22 to 33
20
Thermal Diffusivity, mm2/s 12
11
Thermal Shock Resistance, points 20 to 38
17

Alloy Composition

Aluminum (Al), % 0
0 to 0.060
Carbon (C), % 0.38 to 0.43
0 to 0.2
Chromium (Cr), % 0.7 to 0.9
0 to 0.3
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 95.1 to 96.3
95.5 to 98.9
Manganese (Mn), % 0.6 to 0.8
1.0 to 1.7
Molybdenum (Mo), % 0.2 to 0.3
0 to 0.1
Nickel (Ni), % 1.7 to 2.0
0 to 1.0
Niobium (Nb), % 0
0 to 0.050
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0.1 to 0.6
Sulfur (S), % 0 to 0.040
0 to 0.015
Vanadium (V), % 0
0 to 0.2