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ASTM A387 Grade 12 Steel vs. ACI-ASTM CN7M Steel

Both ASTM A387 grade 12 steel and ACI-ASTM CN7M 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 ASTM A387 grade 12 steel and the bottom bar is ACI-ASTM CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140 to 160
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 25
44
Fatigue Strength, MPa 190 to 230
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 470 to 520
480
Tensile Strength: Yield (Proof), MPa 260 to 310
200

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 430
1100
Melting Completion (Liquidus), °C 1470
1410
Melting Onset (Solidus), °C 1420
1450
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 44
21
Thermal Expansion, µm/m-K 13
15

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
32
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 1.6
5.6
Embodied Energy, MJ/kg 21
78
Embodied Water, L/kg 51
210

Common Calculations

PREN (Pitting Resistance) 2.7
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 110
170
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 250
110
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 16 to 18
17
Strength to Weight: Bending, points 17 to 18
17
Thermal Diffusivity, mm2/s 12
5.6
Thermal Shock Resistance, points 14 to 15
12

Alloy Composition

Carbon (C), % 0.050 to 0.17
0 to 0.070
Chromium (Cr), % 0.8 to 1.2
19 to 22
Copper (Cu), % 0
3.0 to 4.0
Iron (Fe), % 97 to 98.2
37.4 to 48.5
Manganese (Mn), % 0.4 to 0.65
0 to 1.5
Molybdenum (Mo), % 0.45 to 0.6
2.0 to 3.0
Nickel (Ni), % 0
27.5 to 30.5
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