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ASTM A369 Grade FPB vs. SAE-AISI 8115 Steel

Both ASTM A369 grade FPB and SAE-AISI 8115 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is ASTM A369 grade FPB and the bottom bar is SAE-AISI 8115 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 19
15
Fatigue Strength, MPa 180
320
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 290
370
Tensile Strength: Ultimate (UTS), MPa 470
610
Tensile Strength: Yield (Proof), MPa 270
500

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
410
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
43
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 18
19
Embodied Water, L/kg 46
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78
86
Resilience: Unit (Modulus of Resilience), kJ/m3 190
660
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
21
Strength to Weight: Bending, points 17
20
Thermal Diffusivity, mm2/s 14
12
Thermal Shock Resistance, points 15
19

Alloy Composition

Carbon (C), % 0 to 0.3
0.13 to 0.18
Chromium (Cr), % 0
0.3 to 0.5
Iron (Fe), % 98.1 to 99.61
97.4 to 98.4
Manganese (Mn), % 0.29 to 1.1
0.7 to 0.9
Molybdenum (Mo), % 0
0.080 to 0.15
Nickel (Ni), % 0
0.2 to 0.4
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0.1 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.035
0 to 0.040