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ACI-ASTM CA6NM Steel vs. ACI-ASTM CA40 Steel

Both ACI-ASTM CA6NM steel and ACI-ASTM CA40 steel are iron alloys. Both are furnished in the heat treated (HT) condition. They have a very high 96% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CA6NM steel and the bottom bar is ACI-ASTM CA40 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
310
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
10
Fatigue Strength, MPa 380
460
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
76
Tensile Strength: Ultimate (UTS), MPa 850
910
Tensile Strength: Yield (Proof), MPa 620
860

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Corrosion, °C 390
390
Maximum Temperature: Mechanical, °C 770
750
Melting Completion (Liquidus), °C 1450
1440
Melting Onset (Solidus), °C 1400
1500
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
25
Thermal Expansion, µm/m-K 10
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
7.5
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.5
2.0
Embodied Energy, MJ/kg 34
28
Embodied Water, L/kg 110
100

Common Calculations

PREN (Pitting Resistance) 15
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
89
Resilience: Unit (Modulus of Resilience), kJ/m3 1000
1910
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 30
33
Strength to Weight: Bending, points 26
27
Thermal Diffusivity, mm2/s 6.7
6.7
Thermal Shock Resistance, points 31
33

Alloy Composition

Carbon (C), % 0 to 0.060
0.2 to 0.4
Chromium (Cr), % 11.5 to 14
11.5 to 14
Iron (Fe), % 78.4 to 84.6
81.5 to 88.3
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0.4 to 1.0
0 to 0.5
Nickel (Ni), % 3.5 to 4.5
0 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.040