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SAE-AISI 8630 Steel vs. ACI-ASTM CN3MN Steel

Both SAE-AISI 8630 steel and ACI-ASTM CN3MN steel are iron alloys. They have 48% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8630 steel and the bottom bar is ACI-ASTM CN3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 200
180
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 12 to 24
39
Fatigue Strength, MPa 260 to 350
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
80
Tensile Strength: Ultimate (UTS), MPa 540 to 680
620
Tensile Strength: Yield (Proof), MPa 360 to 560
300

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
460
Thermal Conductivity, W/m-K 39
13
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
33
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 1.5
6.2
Embodied Energy, MJ/kg 20
84
Embodied Water, L/kg 50
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78 to 110
200
Resilience: Unit (Modulus of Resilience), kJ/m3 340 to 840
210
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19 to 24
21
Strength to Weight: Bending, points 19 to 22
20
Thermal Diffusivity, mm2/s 10
3.4
Thermal Shock Resistance, points 18 to 23
14

Alloy Composition

Carbon (C), % 0.28 to 0.33
0 to 0.030
Chromium (Cr), % 0.4 to 0.6
20 to 22
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 96.8 to 97.9
41.4 to 50.3
Manganese (Mn), % 0.7 to 0.9
0 to 2.0
Molybdenum (Mo), % 0.15 to 0.25
6.0 to 7.0
Nickel (Ni), % 0.4 to 0.7
23.5 to 25.5
Nitrogen (N), % 0
0.18 to 0.26
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.010