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ASTM A369 Grade FP12 vs. ASTM A372 Grade J Steel

Both ASTM A369 grade FP12 and ASTM A372 grade J steel are iron alloys. Their average alloy composition is basically identical. 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 FP12 and the bottom bar is ASTM A372 grade J steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
200 to 310
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
17 to 22
Fatigue Strength, MPa 170
310 to 570
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 300
410 to 630
Tensile Strength: Ultimate (UTS), MPa 470
650 to 1020
Tensile Strength: Yield (Proof), MPa 250
430 to 850

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 430
420
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 45
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
2.4
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
1.5
Embodied Energy, MJ/kg 21
20
Embodied Water, L/kg 52
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 81
130 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 160
500 to 1930
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
23 to 36
Strength to Weight: Bending, points 17
21 to 29
Thermal Diffusivity, mm2/s 12
12
Thermal Shock Resistance, points 14
19 to 30

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.35 to 0.5
Chromium (Cr), % 0.8 to 1.3
0.8 to 1.2
Iron (Fe), % 96.8 to 98.4
96.7 to 97.8
Manganese (Mn), % 0.3 to 0.61
0.75 to 1.1
Molybdenum (Mo), % 0.44 to 0.65
0.15 to 0.25
Phosphorus (P), % 0 to 0.025
0 to 0.015
Silicon (Si), % 0 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.025
0 to 0.010