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ASTM A369 Grade FP9 vs. SAE-AISI 4340M Steel

Both ASTM A369 grade FP9 and SAE-AISI 4340M steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 91% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FP9 and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
710
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
6.0
Fatigue Strength, MPa 160
690
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
72
Shear Strength, MPa 300
1360
Tensile Strength: Ultimate (UTS), MPa 470
2340
Tensile Strength: Yield (Proof), MPa 240
1240

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Mechanical, °C 600
430
Melting Completion (Liquidus), °C 1450
1440
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 26
38
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.0
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 10
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
3.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.0
1.9
Embodied Energy, MJ/kg 28
26
Embodied Water, L/kg 87
55

Common Calculations

PREN (Pitting Resistance) 12
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
120
Resilience: Unit (Modulus of Resilience), kJ/m3 140
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 17
84
Strength to Weight: Bending, points 17
51
Thermal Diffusivity, mm2/s 6.9
10
Thermal Shock Resistance, points 13
70

Alloy Composition

Carbon (C), % 0 to 0.15
0.38 to 0.43
Chromium (Cr), % 8.0 to 10
0.7 to 1.0
Iron (Fe), % 87.1 to 90.3
93.3 to 94.8
Manganese (Mn), % 0.3 to 0.6
0.65 to 0.9
Molybdenum (Mo), % 0.9 to 1.1
0.35 to 0.45
Nickel (Ni), % 0
1.7 to 2.0
Phosphorus (P), % 0 to 0.030
0 to 0.012
Silicon (Si), % 0.5 to 1.0
1.5 to 1.8
Sulfur (S), % 0 to 0.030
0 to 0.012
Vanadium (V), % 0
0.050 to 0.1