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SAE-AISI 1118 Steel vs. ASTM A372 Grade L Steel

Both SAE-AISI 1118 steel and ASTM A372 grade L steel are iron alloys. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI 1118 steel and the bottom bar is ASTM A372 grade L steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
350
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 13
14
Fatigue Strength, MPa 260
670
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 300
700
Tensile Strength: Ultimate (UTS), MPa 490
1160
Tensile Strength: Yield (Proof), MPa 410
1040

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
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 52
44
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
3.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.7
Embodied Energy, MJ/kg 19
22
Embodied Water, L/kg 47
54

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 61
150
Resilience: Unit (Modulus of Resilience), kJ/m3 450
2890
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
41
Strength to Weight: Bending, points 18
31
Thermal Diffusivity, mm2/s 14
12
Thermal Shock Resistance, points 15
34

Alloy Composition

Carbon (C), % 0.14 to 0.2
0.38 to 0.43
Chromium (Cr), % 0
0.7 to 0.9
Iron (Fe), % 98 to 98.5
95.2 to 96.3
Manganese (Mn), % 1.3 to 1.6
0.6 to 0.8
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 0
1.7 to 2.0
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0.080 to 0.13
0 to 0.010