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EN 1.6781 Steel vs. ASTM A372 Grade L Steel

Both EN 1.6781 steel and ASTM A372 grade L steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 98% 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 ASTM A372 grade L steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
350
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17
14
Fatigue Strength, MPa 450
670
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 830
1160
Tensile Strength: Yield (Proof), MPa 680
1040

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 450
430
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 44
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
3.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.9
1.7
Embodied Energy, MJ/kg 25
22
Embodied Water, L/kg 60
54

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
150
Resilience: Unit (Modulus of Resilience), kJ/m3 1220
2890
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
41
Strength to Weight: Bending, points 25
31
Thermal Diffusivity, mm2/s 12
12
Thermal Shock Resistance, points 24
34

Alloy Composition

Carbon (C), % 0.15 to 0.19
0.38 to 0.43
Chromium (Cr), % 1.3 to 1.8
0.7 to 0.9
Iron (Fe), % 92.6 to 94.6
95.2 to 96.3
Manganese (Mn), % 0.55 to 0.8
0.6 to 0.8
Molybdenum (Mo), % 0.45 to 0.6
0.2 to 0.3
Nickel (Ni), % 3.0 to 3.5
1.7 to 2.0
Phosphorus (P), % 0 to 0.015
0 to 0.015
Silicon (Si), % 0 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.010