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ASTM A369 Grade FPB vs. ASTM A372 Grade G Steel

Both ASTM A369 grade FPB and ASTM A372 grade G 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 ASTM A372 grade G steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
200 to 280
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 19
20 to 22
Fatigue Strength, MPa 180
310 to 380
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 290
410 to 570
Tensile Strength: Ultimate (UTS), MPa 470
650 to 910
Tensile Strength: Yield (Proof), MPa 270
430 to 550

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
46
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
2.2
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 18
20
Embodied Water, L/kg 46
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78
130 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 190
500 to 810
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
23 to 32
Strength to Weight: Bending, points 17
21 to 27
Thermal Diffusivity, mm2/s 14
13
Thermal Shock Resistance, points 15
19 to 27

Alloy Composition

Carbon (C), % 0 to 0.3
0.25 to 0.35
Chromium (Cr), % 0
0.4 to 0.65
Iron (Fe), % 98.1 to 99.61
97.4 to 98.4
Manganese (Mn), % 0.29 to 1.1
0.7 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.035
0 to 0.015
Silicon (Si), % 0.1 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.035
0 to 0.010