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ASTM A369 Grade FP2 vs. ASTM A369 Grade FP9

Both ASTM A369 grade FP2 and ASTM A369 grade FP9 are iron alloys. They have a moderately high 91% of their average alloy composition in common.

For each property being compared, the top bar is ASTM A369 grade FP2 and the bottom bar is ASTM A369 grade FP9.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 130
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
20
Fatigue Strength, MPa 160
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 270
300
Tensile Strength: Ultimate (UTS), MPa 430
470
Tensile Strength: Yield (Proof), MPa 240
240

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 420
600
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 49
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
10

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
6.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
2.0
Embodied Energy, MJ/kg 20
28
Embodied Water, L/kg 50
87

Common Calculations

PREN (Pitting Resistance) 2.5
12
Resilience: Ultimate (Unit Rupture Work), MJ/m3 75
80
Resilience: Unit (Modulus of Resilience), kJ/m3 150
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 15
17
Strength to Weight: Bending, points 16
17
Thermal Diffusivity, mm2/s 13
6.9
Thermal Shock Resistance, points 13
13

Alloy Composition

Carbon (C), % 0.1 to 0.2
0 to 0.15
Chromium (Cr), % 0.5 to 0.81
8.0 to 10
Iron (Fe), % 97.4 to 98.6
87.1 to 90.3
Manganese (Mn), % 0.3 to 0.61
0.3 to 0.6
Molybdenum (Mo), % 0.44 to 0.65
0.9 to 1.1
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0.1 to 0.3
0.5 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030