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ASTM A369 Grade FP2 vs. ASTM A387 Grade 11 Steel

Both ASTM A369 grade FP2 and ASTM A387 grade 11 steel are iron alloys. They have a very high 99% 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 A387 grade 11 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 130
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
25
Fatigue Strength, MPa 160
200 to 250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 270
320 to 390
Tensile Strength: Ultimate (UTS), MPa 430
500 to 600
Tensile Strength: Yield (Proof), MPa 240
270 to 350

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 420
430
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 49
39
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
2.9
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
1.6
Embodied Energy, MJ/kg 20
21
Embodied Water, L/kg 50
53

Common Calculations

PREN (Pitting Resistance) 2.5
3.1
Resilience: Ultimate (Unit Rupture Work), MJ/m3 75
100 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 150
200 to 320
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 15
18 to 21
Strength to Weight: Bending, points 16
18 to 20
Thermal Diffusivity, mm2/s 13
11
Thermal Shock Resistance, points 13
15 to 18

Alloy Composition

Carbon (C), % 0.1 to 0.2
0.050 to 0.17
Chromium (Cr), % 0.5 to 0.81
1.0 to 1.5
Iron (Fe), % 97.4 to 98.6
96.2 to 97.6
Manganese (Mn), % 0.3 to 0.61
0.4 to 0.65
Molybdenum (Mo), % 0.44 to 0.65
0.45 to 0.65
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0.1 to 0.3
0.5 to 0.8
Sulfur (S), % 0 to 0.025
0 to 0.025