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AISI 409 Stainless Steel vs. ACI-ASTM CN7M Steel

Both AISI 409 stainless steel and ACI-ASTM CN7M steel are iron alloys. They have 55% 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 CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 24
44
Fatigue Strength, MPa 140
190
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
77
Tensile Strength: Ultimate (UTS), MPa 420
480
Tensile Strength: Yield (Proof), MPa 200
200

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Maximum Temperature: Corrosion, °C 450
430
Maximum Temperature: Mechanical, °C 710
1100
Melting Completion (Liquidus), °C 1450
1410
Melting Onset (Solidus), °C 1400
1450
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 25
21
Thermal Expansion, µm/m-K 11
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
32
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 2.0
5.6
Embodied Energy, MJ/kg 28
78
Embodied Water, L/kg 94
210

Common Calculations

PREN (Pitting Resistance) 11
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
170
Resilience: Unit (Modulus of Resilience), kJ/m3 100
110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 15
17
Strength to Weight: Bending, points 16
17
Thermal Diffusivity, mm2/s 6.7
5.6
Thermal Shock Resistance, points 15
12

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.070
Chromium (Cr), % 10.5 to 11.7
19 to 22
Copper (Cu), % 0
3.0 to 4.0
Iron (Fe), % 84.9 to 89.5
37.4 to 48.5
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0 to 0.5
27.5 to 30.5
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.040
Titanium (Ti), % 0 to 0.75
0