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EN 1.6781 Steel vs. SAE-AISI 1340 Steel

Both EN 1.6781 steel and SAE-AISI 1340 steel are iron alloys. They have a moderately high 95% of their average alloy composition in common. There are 30 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 1.6781 steel and the bottom bar is SAE-AISI 1340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
160 to 210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17
11 to 23
Fatigue Strength, MPa 450
220 to 390
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Tensile Strength: Ultimate (UTS), MPa 830
540 to 730
Tensile Strength: Yield (Proof), MPa 680
300 to 620

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 450
400
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 44
51
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
1.9
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.9
1.4
Embodied Energy, MJ/kg 25
19
Embodied Water, L/kg 60
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
78 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 1220
240 to 1040
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
19 to 26
Strength to Weight: Bending, points 25
19 to 23
Thermal Diffusivity, mm2/s 12
14
Thermal Shock Resistance, points 24
17 to 23

Alloy Composition

Carbon (C), % 0.15 to 0.19
0.38 to 0.43
Chromium (Cr), % 1.3 to 1.8
0
Iron (Fe), % 92.6 to 94.6
97.2 to 97.9
Manganese (Mn), % 0.55 to 0.8
1.6 to 1.9
Molybdenum (Mo), % 0.45 to 0.6
0
Nickel (Ni), % 3.0 to 3.5
0
Phosphorus (P), % 0 to 0.015
0 to 0.035
Silicon (Si), % 0 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.040