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ACI-ASTM CA6N Steel vs. ACI-ASTM CN7MS Steel

Both ACI-ASTM CA6N steel and ACI-ASTM CN7MS steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have 69% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CA6N steel and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 17
39
Fatigue Strength, MPa 640
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
77
Tensile Strength: Ultimate (UTS), MPa 1080
540
Tensile Strength: Yield (Proof), MPa 1060
230

Thermal Properties

Latent Heat of Fusion, J/g 280
340
Maximum Temperature: Corrosion, °C 390
420
Maximum Temperature: Mechanical, °C 740
1040
Melting Completion (Liquidus), °C 1440
1400
Melting Onset (Solidus), °C 1400
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 23
12
Thermal Expansion, µm/m-K 9.9
16

Otherwise Unclassified Properties

Base Metal Price, % relative 11
28
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.5
5.1
Embodied Energy, MJ/kg 35
71
Embodied Water, L/kg 110
180

Common Calculations

PREN (Pitting Resistance) 12
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
170
Resilience: Unit (Modulus of Resilience), kJ/m3 2900
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 38
19
Strength to Weight: Bending, points 30
19
Thermal Diffusivity, mm2/s 6.1
3.2
Thermal Shock Resistance, points 40
13

Alloy Composition

Carbon (C), % 0 to 0.060
0 to 0.070
Chromium (Cr), % 10.5 to 12.5
18 to 20
Copper (Cu), % 0
1.5 to 2.0
Iron (Fe), % 77.9 to 83.5
45.4 to 53.5
Manganese (Mn), % 0 to 0.5
0 to 1.0
Molybdenum (Mo), % 0
2.5 to 3.0
Nickel (Ni), % 6.0 to 8.0
22 to 25
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 1.0
2.5 to 3.5
Sulfur (S), % 0 to 0.020
0 to 0.030