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ASTM A372 Grade G Steel vs. ACI-ASTM CN3MN Steel

Both ASTM A372 grade G steel and ACI-ASTM CN3MN steel are iron alloys. They have 48% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A372 grade G steel and the bottom bar is ACI-ASTM CN3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 280
180
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 20 to 22
39
Fatigue Strength, MPa 310 to 380
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
80
Tensile Strength: Ultimate (UTS), MPa 650 to 910
620
Tensile Strength: Yield (Proof), MPa 430 to 550
300

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
460
Thermal Conductivity, W/m-K 46
13
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 2.2
33
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 1.5
6.2
Embodied Energy, MJ/kg 20
84
Embodied Water, L/kg 49
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 160
200
Resilience: Unit (Modulus of Resilience), kJ/m3 500 to 810
210
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23 to 32
21
Strength to Weight: Bending, points 21 to 27
20
Thermal Diffusivity, mm2/s 13
3.4
Thermal Shock Resistance, points 19 to 27
14

Alloy Composition

Carbon (C), % 0.25 to 0.35
0 to 0.030
Chromium (Cr), % 0.4 to 0.65
20 to 22
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 97.4 to 98.4
41.4 to 50.3
Manganese (Mn), % 0.7 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.15 to 0.25
6.0 to 7.0
Nickel (Ni), % 0
23.5 to 25.5
Nitrogen (N), % 0
0.18 to 0.26
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.010