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ACI-ASTM CD4MCuN Steel vs. ASTM A387 Grade 91 Class 2

Both ACI-ASTM CD4MCuN steel and ASTM A387 grade 91 class 2 are iron alloys. Both are furnished in the normalized and tempered condition. They have 74% 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 ACI-ASTM CD4MCuN steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 18
20
Fatigue Strength, MPa 340
330
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
75
Tensile Strength: Ultimate (UTS), MPa 770
670
Tensile Strength: Yield (Proof), MPa 550
470

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Mechanical, °C 1100
600
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 17
26
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
10

Otherwise Unclassified Properties

Base Metal Price, % relative 18
7.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.5
2.6
Embodied Energy, MJ/kg 49
37
Embodied Water, L/kg 180
88

Common Calculations

PREN (Pitting Resistance) 35
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
120
Resilience: Unit (Modulus of Resilience), kJ/m3 760
580
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28
24
Strength to Weight: Bending, points 24
22
Thermal Diffusivity, mm2/s 4.5
6.9
Thermal Shock Resistance, points 21
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.040
0.080 to 0.12
Chromium (Cr), % 24.5 to 26.5
8.0 to 9.5
Copper (Cu), % 2.7 to 3.3
0
Iron (Fe), % 59.5 to 66.3
87.3 to 90.3
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 1.7 to 2.3
0.85 to 1.1
Nickel (Ni), % 4.7 to 6.0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0.1 to 0.25
0.030 to 0.070
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 1.0
0.2 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010