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

Both SAE-AISI 9255 steel and ACI-ASTM CN7MS 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 SAE-AISI 9255 steel and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

Carbon (C), % 0.51 to 0.59
0 to 0.070
Chromium (Cr), % 0
18 to 20
Copper (Cu), % 0
1.5 to 2.0
Iron (Fe), % 96.2 to 97
45.4 to 53.5
Manganese (Mn), % 0.7 to 1.0
0 to 1.0
Molybdenum (Mo), % 0
2.5 to 3.0
Nickel (Ni), % 0
22 to 25
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 1.8 to 2.2
2.5 to 3.5
Sulfur (S), % 0 to 0.040
0 to 0.030