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ACI-ASTM CF8M Steel vs. ACI-ASTM CN7M Steel

Both ACI-ASTM CF8M steel and ACI-ASTM CN7M steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have 77% of their average alloy composition in common.

For each property being compared, the top bar is ACI-ASTM CF8M steel and the bottom bar is ACI-ASTM CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
140
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 50
44
Fatigue Strength, MPa 280
190
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 540
480
Tensile Strength: Yield (Proof), MPa 290
200

Thermal Properties

Latent Heat of Fusion, J/g 300
310
Maximum Temperature: Corrosion, °C 420
430
Maximum Temperature: Mechanical, °C 1000
1100
Melting Completion (Liquidus), °C 1440
1410
Melting Onset (Solidus), °C 1400
1450
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
21
Thermal Expansion, µm/m-K 16
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 19
32
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 3.8
5.6
Embodied Energy, MJ/kg 53
78
Embodied Water, L/kg 160
210

Common Calculations

PREN (Pitting Resistance) 28
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
170
Resilience: Unit (Modulus of Resilience), kJ/m3 210
110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
17
Strength to Weight: Bending, points 19
17
Thermal Diffusivity, mm2/s 4.3
5.6
Thermal Shock Resistance, points 12
12

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.070
Chromium (Cr), % 18 to 21
19 to 22
Copper (Cu), % 0
3.0 to 4.0
Iron (Fe), % 60.3 to 71
37.4 to 48.5
Manganese (Mn), % 0 to 1.5
0 to 1.5
Molybdenum (Mo), % 2.0 to 3.0
2.0 to 3.0
Nickel (Ni), % 9.0 to 12
27.5 to 30.5
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.5
Sulfur (S), % 0 to 0.040
0 to 0.040