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ASTM A387 Grade 9 Steel vs. ACI-ASTM CA40 Steel

Both ASTM A387 grade 9 steel 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 9 steel and the bottom bar is ACI-ASTM CA40 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
310
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20 to 21
10
Fatigue Strength, MPa 160 to 240
460
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
76
Tensile Strength: Ultimate (UTS), MPa 500 to 600
910
Tensile Strength: Yield (Proof), MPa 230 to 350
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 1410
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 9.0
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 10
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
7.5
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.1
2.0
Embodied Energy, MJ/kg 28
28
Embodied Water, L/kg 87
100

Common Calculations

PREN (Pitting Resistance) 12
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
89
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
1910
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18 to 21
33
Strength to Weight: Bending, points 18 to 20
27
Thermal Diffusivity, mm2/s 6.9
6.7
Thermal Shock Resistance, points 14 to 17
33

Alloy Composition

Carbon (C), % 0 to 0.15
0.2 to 0.4
Chromium (Cr), % 8.0 to 10
11.5 to 14
Iron (Fe), % 87.1 to 90.8
81.5 to 88.3
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
0 to 0.5
Nickel (Ni), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0 to 0.025
0 to 0.040
Vanadium (V), % 0 to 0.040
0