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ACI-ASTM CD3MCuN Steel vs. ACI-ASTM CD4MCu Steel

Both ACI-ASTM CD3MCuN steel and ACI-ASTM CD4MCu steel are iron alloys. Both are furnished in the normalized and tempered condition. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is ACI-ASTM CD3MCuN steel and the bottom bar is ACI-ASTM CD4MCu steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 29
18
Fatigue Strength, MPa 370
340
Poisson's Ratio 0.27
0.27
Shear Modulus, GPa 80
79
Tensile Strength: Ultimate (UTS), MPa 790
770
Tensile Strength: Yield (Proof), MPa 500
550

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 450
450
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 20
18
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.9
3.5
Embodied Energy, MJ/kg 54
49
Embodied Water, L/kg 180
180

Common Calculations

PREN (Pitting Resistance) 41
32
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
130
Resilience: Unit (Modulus of Resilience), kJ/m3 620
760
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28
28
Strength to Weight: Bending, points 24
24
Thermal Diffusivity, mm2/s 4.1
4.5
Thermal Shock Resistance, points 22
21

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.040
Chromium (Cr), % 24 to 26.7
24.5 to 26.5
Copper (Cu), % 1.4 to 1.9
2.8 to 3.3
Iron (Fe), % 58.2 to 65.9
59.9 to 66.3
Manganese (Mn), % 0 to 1.2
0 to 1.0
Molybdenum (Mo), % 2.9 to 3.8
1.8 to 2.3
Nickel (Ni), % 5.6 to 6.7
4.8 to 6.0
Nitrogen (N), % 0.22 to 0.33
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 1.1
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.040