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ACI-ASTM CN7MS Steel vs. S31730 Stainless Steel

Both ACI-ASTM CN7MS steel and S31730 stainless steel are iron alloys. They have 89% of their average alloy composition in common. There are 28 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 S31730 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
180
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
40
Fatigue Strength, MPa 200
170
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 540
540
Tensile Strength: Yield (Proof), MPa 230
200

Thermal Properties

Latent Heat of Fusion, J/g 340
290
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 1040
990
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1350
1390
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 28
24
Density, g/cm3 7.9
8.0
Embodied Carbon, kg CO2/kg material 5.1
4.6
Embodied Energy, MJ/kg 71
63
Embodied Water, L/kg 180
180

Common Calculations

PREN (Pitting Resistance) 28
30
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
170
Resilience: Unit (Modulus of Resilience), kJ/m3 140
99
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
19
Strength to Weight: Bending, points 19
18
Thermal Shock Resistance, points 13
12

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.030
Chromium (Cr), % 18 to 20
17 to 19
Copper (Cu), % 1.5 to 2.0
4.0 to 5.0
Iron (Fe), % 45.4 to 53.5
52.4 to 61
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 2.5 to 3.0
3.0 to 4.0
Nickel (Ni), % 22 to 25
15 to 16.5
Nitrogen (N), % 0
0 to 0.045
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 0.010