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ASTM A356 Grade 8 vs. ASTM A369 Grade FP2

Both ASTM A356 grade 8 and ASTM A369 grade FP2 are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 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 ASTM A356 grade 8 and the bottom bar is ASTM A369 grade FP2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
130
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
20
Fatigue Strength, MPa 270
160
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 630
430
Tensile Strength: Yield (Proof), MPa 390
240

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 440
420
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1430
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 38
49
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
2.6
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.0
1.6
Embodied Energy, MJ/kg 26
20
Embodied Water, L/kg 55
50

Common Calculations

PREN (Pitting Resistance) 4.7
2.5
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
75
Resilience: Unit (Modulus of Resilience), kJ/m3 390
150
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22
15
Strength to Weight: Bending, points 21
16
Thermal Diffusivity, mm2/s 10
13
Thermal Shock Resistance, points 18
13

Alloy Composition

Carbon (C), % 0 to 0.2
0.1 to 0.2
Chromium (Cr), % 1.0 to 1.5
0.5 to 0.81
Iron (Fe), % 95.4 to 97.4
97.4 to 98.6
Manganese (Mn), % 0.5 to 0.9
0.3 to 0.61
Molybdenum (Mo), % 0.9 to 1.2
0.44 to 0.65
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.2 to 0.6
0.1 to 0.3
Sulfur (S), % 0 to 0.030
0 to 0.025
Vanadium (V), % 0.050 to 0.15
0