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S82031 Stainless Steel vs. ACI-ASTM CF8M Steel

Both S82031 stainless steel and ACI-ASTM CF8M steel are iron alloys. They have a moderately high 90% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is S82031 stainless steel and the bottom bar is ACI-ASTM CF8M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
50
Fatigue Strength, MPa 490
280
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
78
Tensile Strength: Ultimate (UTS), MPa 780
540
Tensile Strength: Yield (Proof), MPa 570
290

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 430
420
Maximum Temperature: Mechanical, °C 980
1000
Melting Completion (Liquidus), °C 1430
1440
Melting Onset (Solidus), °C 1390
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 13
19
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.8
3.8
Embodied Energy, MJ/kg 39
53
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 27
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 280
230
Resilience: Unit (Modulus of Resilience), kJ/m3 820
210
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28
19
Strength to Weight: Bending, points 24
19
Thermal Diffusivity, mm2/s 3.9
4.3
Thermal Shock Resistance, points 22
12

Alloy Composition

Carbon (C), % 0 to 0.050
0 to 0.080
Chromium (Cr), % 19 to 22
18 to 21
Copper (Cu), % 0 to 1.0
0
Iron (Fe), % 68 to 78.3
60.3 to 71
Manganese (Mn), % 0 to 2.5
0 to 1.5
Molybdenum (Mo), % 0.6 to 1.4
2.0 to 3.0
Nickel (Ni), % 2.0 to 4.0
9.0 to 12
Nitrogen (N), % 0.14 to 0.24
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.8
0 to 2.0
Sulfur (S), % 0 to 0.0050
0 to 0.040