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ACI-ASTM CD6MN Steel vs. ACI-ASTM CD3MN Steel

Both ACI-ASTM CD6MN steel and ACI-ASTM CD3MN 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 CD6MN steel and the bottom bar is ACI-ASTM CD3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 28
29
Fatigue Strength, MPa 370
340
Poisson's Ratio 0.27
0.27
Shear Modulus, GPa 80
79
Tensile Strength: Ultimate (UTS), MPa 730
710
Tensile Strength: Yield (Proof), MPa 510
460

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 450
430
Maximum Temperature: Mechanical, °C 1100
1060
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1390
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
16
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 17
18
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.4
3.6
Embodied Energy, MJ/kg 48
50
Embodied Water, L/kg 170
160

Common Calculations

PREN (Pitting Resistance) 36
35
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
180
Resilience: Unit (Modulus of Resilience), kJ/m3 650
530
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26
25
Strength to Weight: Bending, points 23
23
Thermal Diffusivity, mm2/s 4.4
4.3
Thermal Shock Resistance, points 20
20

Alloy Composition

Carbon (C), % 0 to 0.060
0 to 0.030
Chromium (Cr), % 24 to 27
21 to 23.5
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 62.1 to 70.1
62.6 to 71.9
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 1.8 to 2.5
2.5 to 3.5
Nickel (Ni), % 4.0 to 6.0
4.5 to 6.5
Nitrogen (N), % 0.15 to 0.25
0.1 to 0.3
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 0.020