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AISI 409 Stainless Steel vs. ACI-ASTM CF20 Steel

Both AISI 409 stainless steel and ACI-ASTM CF20 steel are iron alloys. They have 82% of their average alloy composition in common. There are 31 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 AISI 409 stainless steel and the bottom bar is ACI-ASTM CF20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 24
50
Fatigue Strength, MPa 140
240
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
77
Tensile Strength: Ultimate (UTS), MPa 420
530
Tensile Strength: Yield (Proof), MPa 200
250

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Maximum Temperature: Corrosion, °C 450
420
Maximum Temperature: Mechanical, °C 710
970
Melting Completion (Liquidus), °C 1450
1420
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
16
Thermal Expansion, µm/m-K 11
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
16
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.0
3.1
Embodied Energy, MJ/kg 28
44
Embodied Water, L/kg 94
150

Common Calculations

PREN (Pitting Resistance) 11
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
220
Resilience: Unit (Modulus of Resilience), kJ/m3 100
160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 15
19
Strength to Weight: Bending, points 16
19
Thermal Diffusivity, mm2/s 6.7
4.3
Thermal Shock Resistance, points 15
11

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.2
Chromium (Cr), % 10.5 to 11.7
18 to 21
Iron (Fe), % 84.9 to 89.5
64.2 to 74
Manganese (Mn), % 0 to 1.0
0 to 1.5
Nickel (Ni), % 0 to 0.5
8.0 to 11
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040
Titanium (Ti), % 0 to 0.75
0