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

Both ASTM A387 grade 2 steel and ACI-ASTM CA40 steel are iron alloys. They have 87% 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 2 steel and the bottom bar is ACI-ASTM CA40 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140 to 170
310
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 25
10
Fatigue Strength, MPa 190 to 250
460
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 470 to 550
910
Tensile Strength: Yield (Proof), MPa 260 to 350
860

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 420
750
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1420
1500
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 45
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
7.5
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.6
2.0
Embodied Energy, MJ/kg 20
28
Embodied Water, L/kg 50
100

Common Calculations

PREN (Pitting Resistance) 2.4
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 120
89
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 320
1910
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 16 to 20
33
Strength to Weight: Bending, points 17 to 19
27
Thermal Diffusivity, mm2/s 12
6.7
Thermal Shock Resistance, points 14 to 16
33

Alloy Composition

Carbon (C), % 0.050 to 0.21
0.2 to 0.4
Chromium (Cr), % 0.5 to 0.8
11.5 to 14
Iron (Fe), % 97.1 to 98.3
81.5 to 88.3
Manganese (Mn), % 0.55 to 0.8
0 to 1.0
Molybdenum (Mo), % 0.45 to 0.6
0 to 0.5
Nickel (Ni), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0.15 to 0.4
0 to 1.5
Sulfur (S), % 0 to 0.025
0 to 0.040