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ACI-ASTM CD4MCuN Steel vs. ACI-ASTM CD6MN Steel

Both ACI-ASTM CD4MCuN steel and ACI-ASTM CD6MN steel are iron alloys. Both are furnished in the normalized and tempered condition. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is ACI-ASTM CD4MCuN steel and the bottom bar is ACI-ASTM CD6MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 18
28
Fatigue Strength, MPa 340
370
Poisson's Ratio 0.27
0.27
Shear Modulus, GPa 79
80
Tensile Strength: Ultimate (UTS), MPa 770
730
Tensile Strength: Yield (Proof), MPa 550
510

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 1420
1440
Melting Onset (Solidus), °C 1380
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 17
16
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 18
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.5
3.4
Embodied Energy, MJ/kg 49
48
Embodied Water, L/kg 180
170

Common Calculations

PREN (Pitting Resistance) 35
36
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
180
Resilience: Unit (Modulus of Resilience), kJ/m3 760
650
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28
26
Strength to Weight: Bending, points 24
23
Thermal Diffusivity, mm2/s 4.5
4.4
Thermal Shock Resistance, points 21
20

Alloy Composition

Carbon (C), % 0 to 0.040
0 to 0.060
Chromium (Cr), % 24.5 to 26.5
24 to 27
Copper (Cu), % 2.7 to 3.3
0
Iron (Fe), % 59.5 to 66.3
62.1 to 70.1
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 1.7 to 2.3
1.8 to 2.5
Nickel (Ni), % 4.7 to 6.0
4.0 to 6.0
Nitrogen (N), % 0.1 to 0.25
0.15 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.040