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ACI-ASTM CN7MS Steel vs. S31277 Stainless Steel

Both ACI-ASTM CN7MS steel and S31277 stainless steel are iron alloys. They have 88% of their average alloy composition in common. There are 27 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 S31277 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 39
45
Fatigue Strength, MPa 200
380
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
80
Tensile Strength: Ultimate (UTS), MPa 540
860
Tensile Strength: Yield (Proof), MPa 230
410

Thermal Properties

Latent Heat of Fusion, J/g 340
310
Maximum Temperature: Corrosion, °C 420
430
Maximum Temperature: Mechanical, °C 1040
1100
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1350
1410
Specific Heat Capacity, J/kg-K 480
460
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 28
36
Density, g/cm3 7.9
8.1
Embodied Carbon, kg CO2/kg material 5.1
6.7
Embodied Energy, MJ/kg 71
90
Embodied Water, L/kg 180
220

Common Calculations

PREN (Pitting Resistance) 28
51
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
320
Resilience: Unit (Modulus of Resilience), kJ/m3 140
410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
29
Strength to Weight: Bending, points 19
25
Thermal Shock Resistance, points 13
19

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.020
Chromium (Cr), % 18 to 20
20.5 to 23
Copper (Cu), % 1.5 to 2.0
0.5 to 1.5
Iron (Fe), % 45.4 to 53.5
35.5 to 46.2
Manganese (Mn), % 0 to 1.0
0 to 3.0
Molybdenum (Mo), % 2.5 to 3.0
6.5 to 8.0
Nickel (Ni), % 22 to 25
26 to 28
Nitrogen (N), % 0
0.3 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 2.5 to 3.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.010