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ACI-ASTM CN7M Steel vs. S31100 Stainless Steel

Both ACI-ASTM CN7M steel and S31100 stainless steel are iron alloys. They have 71% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7M steel and the bottom bar is S31100 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
270
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 44
4.5
Fatigue Strength, MPa 190
330
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 480
1000
Tensile Strength: Yield (Proof), MPa 200
710

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Maximum Temperature: Corrosion, °C 430
470
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1410
1420
Melting Onset (Solidus), °C 1450
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 21
16
Thermal Expansion, µm/m-K 15
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 32
16
Density, g/cm3 8.1
7.7
Embodied Carbon, kg CO2/kg material 5.6
3.1
Embodied Energy, MJ/kg 78
44
Embodied Water, L/kg 210
170

Common Calculations

PREN (Pitting Resistance) 29
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
40
Resilience: Unit (Modulus of Resilience), kJ/m3 110
1240
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
36
Strength to Weight: Bending, points 17
29
Thermal Diffusivity, mm2/s 5.6
4.2
Thermal Shock Resistance, points 12
28

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.060
Chromium (Cr), % 19 to 22
25 to 27
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 37.4 to 48.5
63.6 to 69
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 27.5 to 30.5
6.0 to 7.0
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030
Titanium (Ti), % 0
0 to 0.25