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ACI-ASTM CN7MS Steel vs. SAE-AISI 9255 Steel

Both ACI-ASTM CN7MS steel and SAE-AISI 9255 steel are iron alloys. They have 52% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (5, 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 9255 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 39
21
Fatigue Strength, MPa 200
270
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Tensile Strength: Ultimate (UTS), MPa 540
680
Tensile Strength: Yield (Proof), MPa 230
390

Thermal Properties

Latent Heat of Fusion, J/g 340
280
Maximum Temperature: Mechanical, °C 1040
400
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1350
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 12
46
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 28
2.0
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 5.1
1.5
Embodied Energy, MJ/kg 71
20
Embodied Water, L/kg 180
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
120
Resilience: Unit (Modulus of Resilience), kJ/m3 140
400
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
24
Strength to Weight: Bending, points 19
22
Thermal Diffusivity, mm2/s 3.2
13
Thermal Shock Resistance, points 13
21

Alloy Composition

Carbon (C), % 0 to 0.070
0.51 to 0.59
Chromium (Cr), % 18 to 20
0
Copper (Cu), % 1.5 to 2.0
0
Iron (Fe), % 45.4 to 53.5
96.2 to 97
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 0.035
Silicon (Si), % 2.5 to 3.5
1.8 to 2.2
Sulfur (S), % 0 to 0.030
0 to 0.040