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ASTM A387 Grade 12 Steel vs. ASTM A369 Grade FP9

Both ASTM A387 grade 12 steel 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 A387 grade 12 steel and the bottom bar is ASTM A369 grade FP9.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140 to 160
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 25
20
Fatigue Strength, MPa 190 to 230
160
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 300 to 330
300
Tensile Strength: Ultimate (UTS), MPa 470 to 520
470
Tensile Strength: Yield (Proof), MPa 260 to 310
240

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 430
600
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
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 8.3
10

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
6.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.6
2.0
Embodied Energy, MJ/kg 21
28
Embodied Water, L/kg 51
87

Common Calculations

PREN (Pitting Resistance) 2.7
12
Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 110
80
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 250
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 16 to 18
17
Strength to Weight: Bending, points 17 to 18
17
Thermal Diffusivity, mm2/s 12
6.9
Thermal Shock Resistance, points 14 to 15
13

Alloy Composition

Carbon (C), % 0.050 to 0.17
0 to 0.15
Chromium (Cr), % 0.8 to 1.2
8.0 to 10
Iron (Fe), % 97 to 98.2
87.1 to 90.3
Manganese (Mn), % 0.4 to 0.65
0.3 to 0.6
Molybdenum (Mo), % 0.45 to 0.6
0.9 to 1.1
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0.15 to 0.4
0.5 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030