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SAE-AISI A7 Steel vs. ACI-ASTM CN7M Steel

Both SAE-AISI A7 steel and ACI-ASTM CN7M steel are iron alloys. They have 50% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, 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 CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Tensile Strength: Ultimate (UTS), MPa 800 to 2150
480

Thermal Properties

Latent Heat of Fusion, J/g 260
310
Melting Completion (Liquidus), °C 1470
1410
Melting Onset (Solidus), °C 1430
1450
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 37
21
Thermal Expansion, µm/m-K 12
15

Otherwise Unclassified Properties

Base Metal Price, % relative 10
32
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 13
5.6
Embodied Energy, MJ/kg 200
78
Embodied Water, L/kg 100
210

Common Calculations

PREN (Pitting Resistance) 11
29
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 29 to 77
17
Strength to Weight: Bending, points 25 to 48
17
Thermal Diffusivity, mm2/s 10
5.6
Thermal Shock Resistance, points 27 to 72
12

Alloy Composition

Carbon (C), % 2.0 to 2.9
0 to 0.070
Chromium (Cr), % 5.0 to 5.8
19 to 22
Copper (Cu), % 0 to 0.25
3.0 to 4.0
Iron (Fe), % 81.4 to 87.7
37.4 to 48.5
Manganese (Mn), % 0 to 0.8
0 to 1.5
Molybdenum (Mo), % 0.9 to 1.4
2.0 to 3.0
Nickel (Ni), % 0 to 0.3
27.5 to 30.5
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.5
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