ASTM A369 Grade FPA vs. SAE-AISI 1118 Steel
Both ASTM A369 grade FPA and SAE-AISI 1118 steel are iron alloys. Their average alloy composition is basically identical.
For each property being compared, the top bar is ASTM A369 grade FPA and the bottom bar is SAE-AISI 1118 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 110 | |
140 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 27 | |
13 |
Fatigue Strength, MPa | 180 | |
260 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 73 | |
73 |
Shear Strength, MPa | 240 | |
300 |
Tensile Strength: Ultimate (UTS), MPa | 380 | |
490 |
Tensile Strength: Yield (Proof), MPa | 240 | |
410 |
Thermal Properties
Latent Heat of Fusion, J/g | 250 | |
250 |
Maximum Temperature: Mechanical, °C | 400 | |
400 |
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 | |
52 |
Thermal Expansion, µm/m-K | 12 | |
12 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.1 | |
7.1 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.1 | |
8.1 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 1.8 | |
1.9 |
Density, g/cm3 | 7.8 | |
7.8 |
Embodied Carbon, kg CO2/kg material | 1.4 | |
1.4 |
Embodied Energy, MJ/kg | 18 | |
19 |
Embodied Water, L/kg | 46 | |
47 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 89 | |
61 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 150 | |
450 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 13 | |
17 |
Strength to Weight: Bending, points | 15 | |
18 |
Thermal Diffusivity, mm2/s | 14 | |
14 |
Thermal Shock Resistance, points | 12 | |
15 |
Alloy Composition
Carbon (C), % | 0 to 0.25 | |
0.14 to 0.2 |
Iron (Fe), % | 98.3 to 99.63 | |
98 to 98.5 |
Manganese (Mn), % | 0.27 to 0.93 | |
1.3 to 1.6 |
Phosphorus (P), % | 0 to 0.035 | |
0 to 0.040 |
Silicon (Si), % | 0.1 to 0.5 | |
0 |
Sulfur (S), % | 0 to 0.035 | |
0.080 to 0.13 |