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ASTM A387 Grade 91 Class 2 vs. ACI-ASTM CA40 Steel

Both ASTM A387 grade 91 class 2 and ACI-ASTM CA40 steel are iron alloys. They have a very high 95% of their average alloy composition in common. There are 31 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 CA40 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
310
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
10
Fatigue Strength, MPa 330
460
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
76
Tensile Strength: Ultimate (UTS), MPa 670
910
Tensile Strength: Yield (Proof), MPa 470
860

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Mechanical, °C 600
750
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1500
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 26
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 10
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
7.5
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.6
2.0
Embodied Energy, MJ/kg 37
28
Embodied Water, L/kg 88
100

Common Calculations

PREN (Pitting Resistance) 13
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
89
Resilience: Unit (Modulus of Resilience), kJ/m3 580
1910
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
33
Strength to Weight: Bending, points 22
27
Thermal Diffusivity, mm2/s 6.9
6.7
Thermal Shock Resistance, points 19
33

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0.2 to 0.4
Chromium (Cr), % 8.0 to 9.5
11.5 to 14
Iron (Fe), % 87.3 to 90.3
81.5 to 88.3
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.85 to 1.1
0 to 0.5
Nickel (Ni), % 0 to 0.4
0 to 1.0
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0.2 to 0.5
0 to 1.5
Sulfur (S), % 0 to 0.010
0 to 0.040
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0