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S31266 Stainless Steel vs. ACI-ASTM CN7MS Steel

Both S31266 stainless steel and ACI-ASTM CN7MS steel are iron alloys. They have 87% of their average alloy composition in common. There are 29 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 S31266 stainless steel and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 40
39
Fatigue Strength, MPa 400
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 81
77
Tensile Strength: Ultimate (UTS), MPa 860
540
Tensile Strength: Yield (Proof), MPa 470
230

Thermal Properties

Latent Heat of Fusion, J/g 310
340
Maximum Temperature: Corrosion, °C 440
420
Maximum Temperature: Mechanical, °C 1100
1040
Melting Completion (Liquidus), °C 1470
1400
Melting Onset (Solidus), °C 1420
1350
Specific Heat Capacity, J/kg-K 460
480
Thermal Conductivity, W/m-K 12
12
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 37
28
Density, g/cm3 8.2
7.9
Embodied Carbon, kg CO2/kg material 6.5
5.1
Embodied Energy, MJ/kg 89
71
Embodied Water, L/kg 220
180

Common Calculations

PREN (Pitting Resistance) 54
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 290
170
Resilience: Unit (Modulus of Resilience), kJ/m3 540
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29
19
Strength to Weight: Bending, points 24
19
Thermal Diffusivity, mm2/s 3.1
3.2
Thermal Shock Resistance, points 18
13

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.070
Chromium (Cr), % 23 to 25
18 to 20
Copper (Cu), % 1.0 to 2.5
1.5 to 2.0
Iron (Fe), % 34.1 to 46
45.4 to 53.5
Manganese (Mn), % 2.0 to 4.0
0 to 1.0
Molybdenum (Mo), % 5.2 to 6.2
2.5 to 3.0
Nickel (Ni), % 21 to 24
22 to 25
Nitrogen (N), % 0.35 to 0.6
0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0 to 1.0
2.5 to 3.5
Sulfur (S), % 0 to 0.020
0 to 0.030
Tungsten (W), % 1.5 to 2.5
0