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SAE-AISI 4340M Steel vs. ACI-ASTM CB6 Steel

Both SAE-AISI 4340M steel and ACI-ASTM CB6 steel are iron alloys. They have 82% of their average alloy composition in common. There are 30 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 4340M steel and the bottom bar is ACI-ASTM CB6 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
18
Fatigue Strength, MPa 690
410
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Tensile Strength: Ultimate (UTS), MPa 2340
880
Tensile Strength: Yield (Proof), MPa 1240
660

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 430
870
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1400
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
17
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
12
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
2.5
Embodied Energy, MJ/kg 26
36
Embodied Water, L/kg 55
130

Common Calculations

PREN (Pitting Resistance) 2.2
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
150
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
1110
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
32
Strength to Weight: Bending, points 51
26
Thermal Diffusivity, mm2/s 10
4.6
Thermal Shock Resistance, points 70
31

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.060
Chromium (Cr), % 0.7 to 1.0
15.5 to 17.5
Iron (Fe), % 93.3 to 94.8
74.4 to 81
Manganese (Mn), % 0.65 to 0.9
0 to 1.0
Molybdenum (Mo), % 0.35 to 0.45
0 to 0.5
Nickel (Ni), % 1.7 to 2.0
3.5 to 5.5
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0 to 1.0
Sulfur (S), % 0 to 0.012
0 to 0.030
Vanadium (V), % 0.050 to 0.1
0