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ACI-ASTM CN7M Steel vs. ASTM A387 Grade 9 Steel

Both ACI-ASTM CN7M steel and ASTM A387 grade 9 steel are iron alloys. They have 54% 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 ACI-ASTM CN7M steel and the bottom bar is ASTM A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 44
20 to 21
Fatigue Strength, MPa 190
160 to 240
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
75
Tensile Strength: Ultimate (UTS), MPa 480
500 to 600
Tensile Strength: Yield (Proof), MPa 200
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 310
270
Maximum Temperature: Mechanical, °C 1100
600
Melting Completion (Liquidus), °C 1410
1460
Melting Onset (Solidus), °C 1450
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 21
26
Thermal Expansion, µm/m-K 15
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
10

Otherwise Unclassified Properties

Base Metal Price, % relative 32
6.5
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 5.6
2.1
Embodied Energy, MJ/kg 78
28
Embodied Water, L/kg 210
87

Common Calculations

PREN (Pitting Resistance) 29
12
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
83 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 110
140 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
18 to 21
Strength to Weight: Bending, points 17
18 to 20
Thermal Diffusivity, mm2/s 5.6
6.9
Thermal Shock Resistance, points 12
14 to 17

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.15
Chromium (Cr), % 19 to 22
8.0 to 10
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 37.4 to 48.5
87.1 to 90.8
Manganese (Mn), % 0 to 1.5
0.3 to 0.6
Molybdenum (Mo), % 2.0 to 3.0
0.9 to 1.1
Nickel (Ni), % 27.5 to 30.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.025
Vanadium (V), % 0
0 to 0.040