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ASTM A372 Grade K Steel vs. ACI-ASTM CD4MCu Steel

Both ASTM A372 grade K steel and ACI-ASTM CD4MCu steel are iron alloys. They have 68% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 ACI-ASTM CD4MCu steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 23
18
Fatigue Strength, MPa 440
340
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
79
Tensile Strength: Ultimate (UTS), MPa 780
770
Tensile Strength: Yield (Proof), MPa 620
550

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 440
1100
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 48
17
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
18
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
3.5
Embodied Energy, MJ/kg 24
49
Embodied Water, L/kg 57
180

Common Calculations

PREN (Pitting Resistance) 2.7
32
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
130
Resilience: Unit (Modulus of Resilience), kJ/m3 1010
760
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 27
28
Strength to Weight: Bending, points 24
24
Thermal Diffusivity, mm2/s 13
4.5
Thermal Shock Resistance, points 23
21

Alloy Composition

Carbon (C), % 0 to 0.18
0 to 0.040
Chromium (Cr), % 1.0 to 1.8
24.5 to 26.5
Copper (Cu), % 0
2.8 to 3.3
Iron (Fe), % 93.4 to 96.6
59.9 to 66.3
Manganese (Mn), % 0.1 to 0.4
0 to 1.0
Molybdenum (Mo), % 0.2 to 0.6
1.8 to 2.3
Nickel (Ni), % 2.0 to 3.3
4.8 to 6.0
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.040