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ACI-ASTM CF20 Steel vs. ACI-ASTM CN7MS Steel

Both ACI-ASTM CF20 steel and ACI-ASTM CN7MS steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have 80% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CF20 steel and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 50
39
Fatigue Strength, MPa 240
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 530
540
Tensile Strength: Yield (Proof), MPa 250
230

Thermal Properties

Latent Heat of Fusion, J/g 300
340
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 970
1040
Melting Completion (Liquidus), °C 1420
1400
Melting Onset (Solidus), °C 1410
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
12
Thermal Expansion, µm/m-K 17
16

Otherwise Unclassified Properties

Base Metal Price, % relative 16
28
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.1
5.1
Embodied Energy, MJ/kg 44
71
Embodied Water, L/kg 150
180

Common Calculations

PREN (Pitting Resistance) 20
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
170
Resilience: Unit (Modulus of Resilience), kJ/m3 160
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
19
Strength to Weight: Bending, points 19
19
Thermal Diffusivity, mm2/s 4.3
3.2
Thermal Shock Resistance, points 11
13

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.070
Chromium (Cr), % 18 to 21
18 to 20
Copper (Cu), % 0
1.5 to 2.0
Iron (Fe), % 64.2 to 74
45.4 to 53.5
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 0
2.5 to 3.0
Nickel (Ni), % 8.0 to 11
22 to 25
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
2.5 to 3.5
Sulfur (S), % 0 to 0.040
0 to 0.030