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SAE-AISI 4340 Steel vs. Grade FDSiCrV Steel

Both SAE-AISI 4340 steel and grade FDSiCrV steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340 steel and the bottom bar is grade FDSiCrV steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 360
630
Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
80
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
2100

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 430
420
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
47
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
2.3
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.7
1.9
Embodied Energy, MJ/kg 22
26
Embodied Water, L/kg 53
50

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 45
75
Strength to Weight: Bending, points 22 to 33
47
Thermal Diffusivity, mm2/s 12
13
Thermal Shock Resistance, points 20 to 38
63

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.5 to 0.7
Chromium (Cr), % 0.7 to 0.9
0.5 to 1.0
Copper (Cu), % 0
0 to 0.12
Iron (Fe), % 95.1 to 96.3
96 to 97.8
Manganese (Mn), % 0.6 to 0.8
0.4 to 0.9
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 1.7 to 2.0
0
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0.15 to 0.35
1.2 to 1.7
Sulfur (S), % 0 to 0.040
0 to 0.025
Vanadium (V), % 0
0.1 to 0.25