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SAE-AISI A9 Steel vs. SAE-AISI 4340M Steel

Both SAE-AISI A9 steel and SAE-AISI 4340M steel are iron alloys. They have a moderately high 93% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A9 steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
72
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
2340

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 35
38
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
3.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.7
1.9
Embodied Energy, MJ/kg 70
26
Embodied Water, L/kg 82
55

Common Calculations

PREN (Pitting Resistance) 10
2.2
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28 to 73
84
Strength to Weight: Bending, points 24 to 46
51
Thermal Diffusivity, mm2/s 9.6
10
Thermal Shock Resistance, points 25 to 66
70

Alloy Composition

Carbon (C), % 0.45 to 0.55
0.38 to 0.43
Chromium (Cr), % 4.8 to 5.5
0.7 to 1.0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87 to 90.5
93.3 to 94.8
Manganese (Mn), % 0 to 0.5
0.65 to 0.9
Molybdenum (Mo), % 1.3 to 1.8
0.35 to 0.45
Nickel (Ni), % 1.3 to 1.8
1.7 to 2.0
Phosphorus (P), % 0 to 0.030
0 to 0.012
Silicon (Si), % 1.0 to 1.2
1.5 to 1.8
Sulfur (S), % 0 to 0.030
0 to 0.012
Vanadium (V), % 0.8 to 1.4
0.050 to 0.1