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ACI-ASTM CN7MS Steel vs. ACI-ASTM CN3MN Steel

Both ACI-ASTM CN7MS steel and ACI-ASTM CN3MN steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have a moderately high 93% 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 CN3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
180
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 39
39
Fatigue Strength, MPa 200
250
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
80
Tensile Strength: Ultimate (UTS), MPa 540
620
Tensile Strength: Yield (Proof), MPa 230
300

Thermal Properties

Latent Heat of Fusion, J/g 340
310
Maximum Temperature: Corrosion, °C 420
430
Maximum Temperature: Mechanical, °C 1040
1100
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1350
1410
Specific Heat Capacity, J/kg-K 480
460
Thermal Conductivity, W/m-K 12
13
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 28
33
Density, g/cm3 7.9
8.1
Embodied Carbon, kg CO2/kg material 5.1
6.2
Embodied Energy, MJ/kg 71
84
Embodied Water, L/kg 180
200

Common Calculations

PREN (Pitting Resistance) 28
46
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
200
Resilience: Unit (Modulus of Resilience), kJ/m3 140
210
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
21
Strength to Weight: Bending, points 19
20
Thermal Diffusivity, mm2/s 3.2
3.4
Thermal Shock Resistance, points 13
14

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.030
Chromium (Cr), % 18 to 20
20 to 22
Copper (Cu), % 1.5 to 2.0
0 to 0.75
Iron (Fe), % 45.4 to 53.5
41.4 to 50.3
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 2.5 to 3.0
6.0 to 7.0
Nickel (Ni), % 22 to 25
23.5 to 25.5
Nitrogen (N), % 0
0.18 to 0.26
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 2.5 to 3.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.010