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ACI-ASTM CN7MS Steel vs. ACI-ASTM CG3M Steel

Both ACI-ASTM CN7MS steel and ACI-ASTM CG3M steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have 84% of their average alloy composition in common. There are 30 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 CN7MS steel and the bottom bar is ACI-ASTM CG3M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
170
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
28
Fatigue Strength, MPa 200
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 540
580
Tensile Strength: Yield (Proof), MPa 230
270

Thermal Properties

Latent Heat of Fusion, J/g 340
300
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 1040
1020
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1350
1400
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 28
20
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 5.1
4.1
Embodied Energy, MJ/kg 71
56
Embodied Water, L/kg 180
160

Common Calculations

PREN (Pitting Resistance) 28
31
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
130
Resilience: Unit (Modulus of Resilience), kJ/m3 140
190
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
20
Strength to Weight: Bending, points 19
20
Thermal Diffusivity, mm2/s 3.2
4.1
Thermal Shock Resistance, points 13
13

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.030
Chromium (Cr), % 18 to 20
18 to 21
Copper (Cu), % 1.5 to 2.0
0
Iron (Fe), % 45.4 to 53.5
58.9 to 70
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 2.5 to 3.0
3.0 to 4.0
Nickel (Ni), % 22 to 25
9.0 to 13
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 2.5 to 3.5
0 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.040