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SAE-AISI A7 Steel vs. ACI-ASTM CD6MN Steel

Both SAE-AISI A7 steel and ACI-ASTM CD6MN steel are iron alloys. They have 74% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A7 steel and the bottom bar is ACI-ASTM CD6MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 72
80
Tensile Strength: Ultimate (UTS), MPa 800 to 2150
730

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1430
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 37
16
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 10
17
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 13
3.4
Embodied Energy, MJ/kg 200
48
Embodied Water, L/kg 100
170

Common Calculations

PREN (Pitting Resistance) 11
36
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 29 to 77
26
Strength to Weight: Bending, points 25 to 48
23
Thermal Diffusivity, mm2/s 10
4.4
Thermal Shock Resistance, points 27 to 72
20

Alloy Composition

Carbon (C), % 2.0 to 2.9
0 to 0.060
Chromium (Cr), % 5.0 to 5.8
24 to 27
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 81.4 to 87.7
62.1 to 70.1
Manganese (Mn), % 0 to 0.8
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.4
1.8 to 2.5
Nickel (Ni), % 0 to 0.3
4.0 to 6.0
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 0.5 to 1.5
0
Vanadium (V), % 3.9 to 5.2
0