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ACI-ASTM CN7MS Steel vs. AISI 440B Stainless Steel

Both ACI-ASTM CN7MS steel and AISI 440B stainless steel are iron alloys. They have 68% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7MS steel and the bottom bar is AISI 440B stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
3.0 to 18
Fatigue Strength, MPa 200
260 to 850
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 540
740 to 1930
Tensile Strength: Yield (Proof), MPa 230
430 to 1860

Thermal Properties

Latent Heat of Fusion, J/g 340
280
Maximum Temperature: Corrosion, °C 420
390
Maximum Temperature: Mechanical, °C 1040
870
Melting Completion (Liquidus), °C 1400
1480
Melting Onset (Solidus), °C 1350
1370
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 12
23
Thermal Expansion, µm/m-K 16
10

Otherwise Unclassified Properties

Base Metal Price, % relative 28
9.0
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 5.1
2.2
Embodied Energy, MJ/kg 71
31
Embodied Water, L/kg 180
120

Common Calculations

PREN (Pitting Resistance) 28
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
57 to 110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
27 to 70
Strength to Weight: Bending, points 19
24 to 45
Thermal Diffusivity, mm2/s 3.2
6.1
Thermal Shock Resistance, points 13
27 to 70

Alloy Composition

Carbon (C), % 0 to 0.070
0.75 to 1.0
Chromium (Cr), % 18 to 20
16 to 18
Copper (Cu), % 1.5 to 2.0
0
Iron (Fe), % 45.4 to 53.5
78.2 to 83.3
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 2.5 to 3.0
0 to 0.75
Nickel (Ni), % 22 to 25
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 2.5 to 3.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015