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EN 1.7710 Steel vs. SAE-AISI 4340M Steel

Both EN 1.7710 steel and SAE-AISI 4340M steel are iron alloys. They have a very high 97% 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 1.7710 steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280 to 320
710
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.8 to 11
6.0
Fatigue Strength, MPa 500 to 620
690
Impact Strength: V-Notched Charpy, J 30
18
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Tensile Strength: Ultimate (UTS), MPa 930 to 1070
2340
Tensile Strength: Yield (Proof), MPa 800 to 1060
1240

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Maximum Temperature: Mechanical, °C 440
430
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
38
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
3.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.2
1.9
Embodied Energy, MJ/kg 30
26
Embodied Water, L/kg 57
55

Common Calculations

PREN (Pitting Resistance) 4.5
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 73 to 100
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1680 to 2970
4120
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 38
84
Strength to Weight: Bending, points 27 to 30
51
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 27 to 31
70

Alloy Composition

Carbon (C), % 0.12 to 0.18
0.38 to 0.43
Chromium (Cr), % 1.3 to 1.8
0.7 to 1.0
Iron (Fe), % 95.1 to 97
93.3 to 94.8
Manganese (Mn), % 0.6 to 1.0
0.65 to 0.9
Molybdenum (Mo), % 0.8 to 1.0
0.35 to 0.45
Nickel (Ni), % 0
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), % 0.15 to 0.25
0.050 to 0.1