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ASTM A372 Grade K Steel vs. ASTM B780 Alloy

ASTM A372 grade K steel belongs to the iron alloys classification, while ASTM B780 alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is ASTM A372 grade K steel and the bottom bar is ASTM B780 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
83
Elongation at Break, % 23
1.1 to 9.1
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 73
30
Shear Strength, MPa 490
200 to 340
Tensile Strength: Ultimate (UTS), MPa 780
330 to 590

Thermal Properties

Latent Heat of Fusion, J/g 250
140
Specific Heat Capacity, J/kg-K 470
270
Thermal Expansion, µm/m-K 13
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
70 to 76
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
62 to 68

Otherwise Unclassified Properties

Density, g/cm3 7.9
10

Common Calculations

Stiffness to Weight: Axial, points 13
4.5
Stiffness to Weight: Bending, points 24
14
Strength to Weight: Axial, points 27
9.1 to 16
Strength to Weight: Bending, points 24
11 to 15
Thermal Shock Resistance, points 23
16 to 29

Alloy Composition

Cadmium (Cd), % 0
0 to 0.050
Carbon (C), % 0 to 0.18
0
Chromium (Cr), % 1.0 to 1.8
0
Copper (Cu), % 0
23.5 to 25.7
Iron (Fe), % 93.4 to 96.6
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Manganese (Mn), % 0.1 to 0.4
0
Molybdenum (Mo), % 0.2 to 0.6
0
Nickel (Ni), % 2.0 to 3.3
0.35 to 0.65
Phosphorus (P), % 0 to 0.015
0
Silicon (Si), % 0.15 to 0.35
0
Silver (Ag), % 0
74 to 76
Sulfur (S), % 0 to 0.010
0
Zinc (Zn), % 0
0 to 0.060