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SAE-AISI 4340M Steel vs. EN 1.6771 Steel

Both SAE-AISI 4340M steel and EN 1.6771 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 SAE-AISI 4340M steel and the bottom bar is EN 1.6771 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
280 to 350
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
8.0 to 8.7
Fatigue Strength, MPa 690
440 to 680
Impact Strength: V-Notched Charpy, J 18
20 to 32
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Tensile Strength: Ultimate (UTS), MPa 2340
930 to 1180
Tensile Strength: Yield (Proof), MPa 1240
740 to 1140

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 430
440
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
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
9.2

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
58

Common Calculations

PREN (Pitting Resistance) 2.2
2.5
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
75 to 93
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
1460 to 3450
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
33 to 41
Strength to Weight: Bending, points 51
27 to 31
Thermal Diffusivity, mm2/s 10
13
Thermal Shock Resistance, points 70
27 to 35

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.27 to 0.33
Chromium (Cr), % 0.7 to 1.0
0.8 to 1.2
Iron (Fe), % 93.3 to 94.8
92.2 to 95
Manganese (Mn), % 0.65 to 0.9
0.6 to 1.0
Molybdenum (Mo), % 0.35 to 0.45
0.3 to 0.6
Nickel (Ni), % 1.7 to 2.0
3.0 to 4.0
Phosphorus (P), % 0 to 0.012
0 to 0.030
Silicon (Si), % 1.5 to 1.8
0 to 0.6
Sulfur (S), % 0 to 0.012
0 to 0.020
Vanadium (V), % 0.050 to 0.1
0