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ACI-ASTM CN7MS Steel vs. ACI-ASTM CA28MWV Steel

Both ACI-ASTM CN7MS steel and ACI-ASTM CA28MWV steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have 64% 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 ACI-ASTM CN7MS steel and the bottom bar is ACI-ASTM CA28MWV steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
330
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
11
Fatigue Strength, MPa 200
470
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
76
Tensile Strength: Ultimate (UTS), MPa 540
1080
Tensile Strength: Yield (Proof), MPa 230
870

Thermal Properties

Latent Heat of Fusion, J/g 340
270
Maximum Temperature: Corrosion, °C 420
380
Maximum Temperature: Mechanical, °C 1040
740
Melting Completion (Liquidus), °C 1400
1470
Melting Onset (Solidus), °C 1350
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 12
25
Thermal Expansion, µm/m-K 16
10

Otherwise Unclassified Properties

Base Metal Price, % relative 28
11
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 5.1
3.1
Embodied Energy, MJ/kg 71
44
Embodied Water, L/kg 180
100

Common Calculations

PREN (Pitting Resistance) 28
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
110
Resilience: Unit (Modulus of Resilience), kJ/m3 140
1920
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
38
Strength to Weight: Bending, points 19
30
Thermal Diffusivity, mm2/s 3.2
6.6
Thermal Shock Resistance, points 13
40

Alloy Composition

Carbon (C), % 0 to 0.070
0.2 to 0.28
Chromium (Cr), % 18 to 20
11 to 12.5
Copper (Cu), % 1.5 to 2.0
0
Iron (Fe), % 45.4 to 53.5
81.4 to 85.8
Manganese (Mn), % 0 to 1.0
0.5 to 1.0
Molybdenum (Mo), % 2.5 to 3.0
0.9 to 1.3
Nickel (Ni), % 22 to 25
0.5 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 2.5 to 3.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0
0.9 to 1.3
Vanadium (V), % 0
0.2 to 0.3