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ASTM A369 Grade FPA vs. ASTM A387 Grade 91 Class 2

Both ASTM A369 grade FPA and ASTM A387 grade 91 class 2 are iron alloys. They have 90% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FPA and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 27
20
Fatigue Strength, MPa 180
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 240
420
Tensile Strength: Ultimate (UTS), MPa 380
670
Tensile Strength: Yield (Proof), MPa 240
470

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 400
600
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
26
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
10

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
7.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
2.6
Embodied Energy, MJ/kg 18
37
Embodied Water, L/kg 46
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
120
Resilience: Unit (Modulus of Resilience), kJ/m3 150
580
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 13
24
Strength to Weight: Bending, points 15
22
Thermal Diffusivity, mm2/s 14
6.9
Thermal Shock Resistance, points 12
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.25
0.080 to 0.12
Chromium (Cr), % 0
8.0 to 9.5
Iron (Fe), % 98.3 to 99.63
87.3 to 90.3
Manganese (Mn), % 0.27 to 0.93
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0.1 to 0.5
0.2 to 0.5
Sulfur (S), % 0 to 0.035
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010