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SAE-AISI 8640 Steel vs. ASTM A369 Grade FP5

Both SAE-AISI 8640 steel and ASTM A369 grade FP5 are iron alloys. Both are furnished in the annealed condition. They have a very high 95% 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 SAE-AISI 8640 steel and the bottom bar is ASTM A369 grade FP5.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 23
20
Fatigue Strength, MPa 270
160
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
74
Shear Strength, MPa 360
300
Tensile Strength: Ultimate (UTS), MPa 570
470
Tensile Strength: Yield (Proof), MPa 380
240

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 410
510
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 39
40
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
4.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.7
Embodied Energy, MJ/kg 20
23
Embodied Water, L/kg 50
69

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
80
Resilience: Unit (Modulus of Resilience), kJ/m3 380
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 20
17
Strength to Weight: Bending, points 20
17
Thermal Diffusivity, mm2/s 10
11
Thermal Shock Resistance, points 17
13

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.15
Chromium (Cr), % 0.4 to 0.6
4.0 to 6.0
Iron (Fe), % 96.6 to 97.8
92.1 to 95.3
Manganese (Mn), % 0.75 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0.15 to 0.25
0.45 to 0.65
Nickel (Ni), % 0.4 to 0.7
0
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.025