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ACI-ASTM CN7MS Steel vs. ASTM B780 Alloy

ACI-ASTM CN7MS steel belongs to the iron alloys classification, while ASTM B780 alloy belongs to the otherwise unclassified metals. There are 14 material properties with values for both materials. Properties with values for just one material (19, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7MS steel and the bottom bar is ASTM B780 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
83
Elongation at Break, % 39
1.1 to 9.1
Poisson's Ratio 0.28
0.36
Shear Modulus, GPa 77
30
Tensile Strength: Ultimate (UTS), MPa 540
330 to 590

Thermal Properties

Latent Heat of Fusion, J/g 340
140
Specific Heat Capacity, J/kg-K 480
270
Thermal Expansion, µm/m-K 16
18

Otherwise Unclassified Properties

Density, g/cm3 7.9
10

Common Calculations

Stiffness to Weight: Axial, points 14
4.5
Stiffness to Weight: Bending, points 25
14
Strength to Weight: Axial, points 19
9.1 to 16
Strength to Weight: Bending, points 19
11 to 15
Thermal Shock Resistance, points 13
16 to 29

Alloy Composition

Cadmium (Cd), % 0
0 to 0.050
Carbon (C), % 0 to 0.070
0
Chromium (Cr), % 18 to 20
0
Copper (Cu), % 1.5 to 2.0
23.5 to 25.7
Iron (Fe), % 45.4 to 53.5
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 2.5 to 3.0
0
Nickel (Ni), % 22 to 25
0.35 to 0.65
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 2.5 to 3.5
0
Silver (Ag), % 0
74 to 76
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.060