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ACI-ASTM CN7MS Steel vs. SAE-AISI 1140 Steel

Both ACI-ASTM CN7MS steel and SAE-AISI 1140 steel are iron alloys. They have 50% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7MS steel and the bottom bar is SAE-AISI 1140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
170 to 180
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 39
14 to 18
Fatigue Strength, MPa 200
230 to 370
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Tensile Strength: Ultimate (UTS), MPa 540
600 to 700
Tensile Strength: Yield (Proof), MPa 230
340 to 570

Thermal Properties

Latent Heat of Fusion, J/g 340
250
Maximum Temperature: Mechanical, °C 1040
400
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1350
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 12
51
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 28
1.8
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 5.1
1.4
Embodied Energy, MJ/kg 71
18
Embodied Water, L/kg 180
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
89 to 93
Resilience: Unit (Modulus of Resilience), kJ/m3 140
310 to 870
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
21 to 25
Strength to Weight: Bending, points 19
20 to 22
Thermal Diffusivity, mm2/s 3.2
14
Thermal Shock Resistance, points 13
18 to 21

Alloy Composition

Carbon (C), % 0 to 0.070
0.37 to 0.44
Chromium (Cr), % 18 to 20
0
Copper (Cu), % 1.5 to 2.0
0
Iron (Fe), % 45.4 to 53.5
98.4 to 98.9
Manganese (Mn), % 0 to 1.0
0.7 to 1.0
Molybdenum (Mo), % 2.5 to 3.0
0
Nickel (Ni), % 22 to 25
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 2.5 to 3.5
0
Sulfur (S), % 0 to 0.030
0.080 to 0.13