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

Both ASTM A372 grade M steel and ACI-ASTM CN3MN steel are iron alloys. They have 52% 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 A372 grade M steel and the bottom bar is ACI-ASTM CN3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240 to 280
180
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 18 to 21
39
Fatigue Strength, MPa 450 to 520
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
80
Tensile Strength: Ultimate (UTS), MPa 810 to 910
620
Tensile Strength: Yield (Proof), MPa 660 to 770
300

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 450
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 8.0
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
33
Density, g/cm3 7.9
8.1
Embodied Carbon, kg CO2/kg material 2.0
6.2
Embodied Energy, MJ/kg 27
84
Embodied Water, L/kg 61
200

Common Calculations

PREN (Pitting Resistance) 3.4
46
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
200
Resilience: Unit (Modulus of Resilience), kJ/m3 1140 to 1580
210
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29 to 32
21
Strength to Weight: Bending, points 24 to 27
20
Thermal Diffusivity, mm2/s 12
3.4
Thermal Shock Resistance, points 24 to 27
14

Alloy Composition

Carbon (C), % 0 to 0.23
0 to 0.030
Chromium (Cr), % 1.5 to 2.0
20 to 22
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 92.5 to 95.1
41.4 to 50.3
Manganese (Mn), % 0.2 to 0.4
0 to 2.0
Molybdenum (Mo), % 0.4 to 0.6
6.0 to 7.0
Nickel (Ni), % 2.8 to 3.9
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 to 0.3
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.010
Vanadium (V), % 0 to 0.080
0