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EN 1.7779 Steel vs. SAE-AISI 4340M Steel

Both EN 1.7779 steel and SAE-AISI 4340M steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 33 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 1.7779 steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
710
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
6.0
Fatigue Strength, MPa 430
690
Impact Strength: V-Notched Charpy, J 38
18
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Shear Strength, MPa 500
1360
Tensile Strength: Ultimate (UTS), MPa 810
2340
Tensile Strength: Yield (Proof), MPa 660
1240

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Maximum Temperature: Mechanical, °C 470
430
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
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 8.9
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
3.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.8
1.9
Embodied Energy, MJ/kg 41
26
Embodied Water, L/kg 64
55

Common Calculations

PREN (Pitting Resistance) 5.0
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1150
4120
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29
84
Strength to Weight: Bending, points 25
51
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 23
70

Alloy Composition

Aluminum (Al), % 0 to 0.040
0
Carbon (C), % 0.17 to 0.23
0.38 to 0.43
Chromium (Cr), % 3.0 to 3.3
0.7 to 1.0
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 93.8 to 95.4
93.3 to 94.8
Manganese (Mn), % 0.3 to 0.5
0.65 to 0.9
Molybdenum (Mo), % 0.5 to 0.6
0.35 to 0.45
Nickel (Ni), % 0 to 0.3
1.7 to 2.0
Phosphorus (P), % 0 to 0.025
0 to 0.012
Silicon (Si), % 0.15 to 0.35
1.5 to 1.8
Sulfur (S), % 0 to 0.010
0 to 0.012
Vanadium (V), % 0.45 to 0.55
0.050 to 0.1