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ACI-ASTM CN7M Steel vs. ASTM A387 Grade 2 Steel

Both ACI-ASTM CN7M steel and ASTM A387 grade 2 steel are iron alloys. They have 45% 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 2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
140 to 170
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 44
25
Fatigue Strength, MPa 190
190 to 250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 480
470 to 550
Tensile Strength: Yield (Proof), MPa 200
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Maximum Temperature: Mechanical, °C 1100
420
Melting Completion (Liquidus), °C 1410
1470
Melting Onset (Solidus), °C 1450
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 21
45
Thermal Expansion, µm/m-K 15
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 32
2.6
Density, g/cm3 8.1
7.9
Embodied Carbon, kg CO2/kg material 5.6
1.6
Embodied Energy, MJ/kg 78
20
Embodied Water, L/kg 210
50

Common Calculations

PREN (Pitting Resistance) 29
2.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
98 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 110
180 to 320
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
16 to 20
Strength to Weight: Bending, points 17
17 to 19
Thermal Diffusivity, mm2/s 5.6
12
Thermal Shock Resistance, points 12
14 to 16

Alloy Composition

Carbon (C), % 0 to 0.070
0.050 to 0.21
Chromium (Cr), % 19 to 22
0.5 to 0.8
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 37.4 to 48.5
97.1 to 98.3
Manganese (Mn), % 0 to 1.5
0.55 to 0.8
Molybdenum (Mo), % 2.0 to 3.0
0.45 to 0.6
Nickel (Ni), % 27.5 to 30.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.5
0.15 to 0.4
Sulfur (S), % 0 to 0.040
0 to 0.025