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ASTM A387 Grade 91 Class 2 vs. ACI-ASTM CB7Cu-2 Steel

Both ASTM A387 grade 91 class 2 and ACI-ASTM CB7Cu-2 steel are iron alloys. They have 86% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 91 class 2 and the bottom bar is ACI-ASTM CB7Cu-2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
300 to 420
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
5.7 to 11
Fatigue Strength, MPa 330
420 to 590
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
75
Tensile Strength: Ultimate (UTS), MPa 670
960 to 1350
Tensile Strength: Yield (Proof), MPa 470
760 to 1180

Thermal Properties

Latent Heat of Fusion, J/g 270
280
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 26
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 10
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
13
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.6
2.6
Embodied Energy, MJ/kg 37
38
Embodied Water, L/kg 88
130

Common Calculations

PREN (Pitting Resistance) 13
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 580
1510 to 3600
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
34 to 48
Strength to Weight: Bending, points 22
28 to 35
Thermal Diffusivity, mm2/s 6.9
4.6
Thermal Shock Resistance, points 19
32 to 45

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0 to 0.070
Chromium (Cr), % 8.0 to 9.5
14 to 15.5
Copper (Cu), % 0
2.5 to 3.2
Iron (Fe), % 87.3 to 90.3
73.6 to 79
Manganese (Mn), % 0.3 to 0.6
0 to 0.7
Molybdenum (Mo), % 0.85 to 1.1
0
Nickel (Ni), % 0 to 0.4
4.5 to 5.5
Niobium (Nb), % 0.060 to 0.1
0 to 0.35
Nitrogen (N), % 0.030 to 0.070
0 to 0.050
Phosphorus (P), % 0 to 0.020
0 to 0.035
Silicon (Si), % 0.2 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0