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EN 1.6579 Steel vs. SAE-AISI 4340M Steel

Both EN 1.6579 steel and SAE-AISI 4340M steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is EN 1.6579 steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260 to 290
710
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 14
6.0
Fatigue Strength, MPa 380 to 570
690
Impact Strength: V-Notched Charpy, J 35 to 41
18
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Tensile Strength: Ultimate (UTS), MPa 850 to 980
2340
Tensile Strength: Yield (Proof), MPa 600 to 910
1240

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 440
430
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
38
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 3.7
3.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
1.9
Embodied Energy, MJ/kg 22
26
Embodied Water, L/kg 56
55

Common Calculations

PREN (Pitting Resistance) 2.4
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100 to 120
120
Resilience: Unit (Modulus of Resilience), kJ/m3 950 to 2210
4120
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 30 to 35
84
Strength to Weight: Bending, points 25 to 28
51
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 25 to 29
70

Alloy Composition

Carbon (C), % 0.32 to 0.38
0.38 to 0.43
Chromium (Cr), % 1.4 to 1.7
0.7 to 1.0
Iron (Fe), % 94.2 to 96.1
93.3 to 94.8
Manganese (Mn), % 0.6 to 1.0
0.65 to 0.9
Molybdenum (Mo), % 0.15 to 0.35
0.35 to 0.45
Nickel (Ni), % 1.4 to 1.7
1.7 to 2.0
Phosphorus (P), % 0 to 0.025
0 to 0.012
Silicon (Si), % 0 to 0.6
1.5 to 1.8
Sulfur (S), % 0 to 0.030
0 to 0.012
Vanadium (V), % 0
0.050 to 0.1