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ACI-ASTM CN7MS Steel vs. S40975 Stainless Steel

Both ACI-ASTM CN7MS steel and S40975 stainless steel are iron alloys. They have 62% of their average alloy composition in common. There are 30 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 CN7MS steel and the bottom bar is S40975 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
170
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 39
22
Fatigue Strength, MPa 200
210
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
75
Tensile Strength: Ultimate (UTS), MPa 540
460
Tensile Strength: Yield (Proof), MPa 230
310

Thermal Properties

Latent Heat of Fusion, J/g 340
270
Maximum Temperature: Corrosion, °C 420
450
Maximum Temperature: Mechanical, °C 1040
710
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1350
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 12
26
Thermal Expansion, µm/m-K 16
10

Otherwise Unclassified Properties

Base Metal Price, % relative 28
6.5
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 5.1
2.0
Embodied Energy, MJ/kg 71
28
Embodied Water, L/kg 180
95

Common Calculations

PREN (Pitting Resistance) 28
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
93
Resilience: Unit (Modulus of Resilience), kJ/m3 140
250
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
17
Strength to Weight: Bending, points 19
17
Thermal Diffusivity, mm2/s 3.2
7.0
Thermal Shock Resistance, points 13
17

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.030
Chromium (Cr), % 18 to 20
10.5 to 11.7
Copper (Cu), % 1.5 to 2.0
0
Iron (Fe), % 45.4 to 53.5
84.4 to 89
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 2.5 to 3.0
0
Nickel (Ni), % 22 to 25
0.5 to 1.0
Nitrogen (N), % 0
0 to 0.030
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 0.030
Titanium (Ti), % 0
0 to 0.75