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ACI-ASTM CN7MS Steel vs. S81921 Stainless Steel

Both ACI-ASTM CN7MS steel and S81921 stainless steel are iron alloys. They have 74% 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 S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
260
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
29
Fatigue Strength, MPa 200
370
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 540
710
Tensile Strength: Yield (Proof), MPa 230
500

Thermal Properties

Latent Heat of Fusion, J/g 340
290
Maximum Temperature: Corrosion, °C 420
430
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
480
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 28
14
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 5.1
2.9
Embodied Energy, MJ/kg 71
41
Embodied Water, L/kg 180
150

Common Calculations

PREN (Pitting Resistance) 28
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
180
Resilience: Unit (Modulus of Resilience), kJ/m3 140
630
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
25
Strength to Weight: Bending, points 19
23
Thermal Diffusivity, mm2/s 3.2
4.0
Thermal Shock Resistance, points 13
20

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.030
Chromium (Cr), % 18 to 20
19 to 22
Copper (Cu), % 1.5 to 2.0
0
Iron (Fe), % 45.4 to 53.5
66.7 to 75.9
Manganese (Mn), % 0 to 1.0
2.0 to 4.0
Molybdenum (Mo), % 2.5 to 3.0
1.0 to 2.0
Nickel (Ni), % 22 to 25
2.0 to 4.0
Nitrogen (N), % 0
0.14 to 0.2
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