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S31655 Stainless Steel vs. ACI-ASTM CN7MS Steel

Both S31655 stainless steel and ACI-ASTM CN7MS steel are iron alloys. They have 80% 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 S31655 stainless steel and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
39
Fatigue Strength, MPa 300
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 710
540
Tensile Strength: Yield (Proof), MPa 350
230

Thermal Properties

Latent Heat of Fusion, J/g 290
340
Maximum Temperature: Corrosion, °C 430
420
Maximum Temperature: Mechanical, °C 1010
1040
Melting Completion (Liquidus), °C 1430
1400
Melting Onset (Solidus), °C 1380
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 17
28
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.3
5.1
Embodied Energy, MJ/kg 46
71
Embodied Water, L/kg 160
180

Common Calculations

PREN (Pitting Resistance) 27
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
170
Resilience: Unit (Modulus of Resilience), kJ/m3 310
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25
19
Strength to Weight: Bending, points 23
19
Thermal Diffusivity, mm2/s 4.0
3.2
Thermal Shock Resistance, points 16
13

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.070
Chromium (Cr), % 19.5 to 21.5
18 to 20
Copper (Cu), % 0 to 1.0
1.5 to 2.0
Iron (Fe), % 63.2 to 71.9
45.4 to 53.5
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0.5 to 1.5
2.5 to 3.0
Nickel (Ni), % 8.0 to 9.5
22 to 25
Nitrogen (N), % 0.14 to 0.25
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
2.5 to 3.5
Sulfur (S), % 0 to 0.015
0 to 0.030