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SAE-AISI 4340M Steel vs. EN 1.6781 Steel

Both SAE-AISI 4340M steel and EN 1.6781 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 SAE-AISI 4340M steel and the bottom bar is EN 1.6781 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
250
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
17
Fatigue Strength, MPa 690
450
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Tensile Strength: Ultimate (UTS), MPa 2340
830
Tensile Strength: Yield (Proof), MPa 1240
680

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Maximum Temperature: Mechanical, °C 430
450
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
1.9
Embodied Energy, MJ/kg 26
25
Embodied Water, L/kg 55
60

Common Calculations

PREN (Pitting Resistance) 2.2
3.3
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
130
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
1220
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
29
Strength to Weight: Bending, points 51
25
Thermal Diffusivity, mm2/s 10
12
Thermal Shock Resistance, points 70
24

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.15 to 0.19
Chromium (Cr), % 0.7 to 1.0
1.3 to 1.8
Iron (Fe), % 93.3 to 94.8
92.6 to 94.6
Manganese (Mn), % 0.65 to 0.9
0.55 to 0.8
Molybdenum (Mo), % 0.35 to 0.45
0.45 to 0.6
Nickel (Ni), % 1.7 to 2.0
3.0 to 3.5
Phosphorus (P), % 0 to 0.012
0 to 0.015
Silicon (Si), % 1.5 to 1.8
0 to 0.5
Sulfur (S), % 0 to 0.012
0 to 0.015
Vanadium (V), % 0.050 to 0.1
0