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AISI 409 Stainless Steel vs. SAE-AISI A9 Steel

Both AISI 409 stainless steel and SAE-AISI A9 steel are iron alloys. They have a moderately high 93% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is AISI 409 stainless steel and the bottom bar is SAE-AISI A9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
74
Tensile Strength: Ultimate (UTS), MPa 420
770 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 25
35
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
7.0
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.0
4.7
Embodied Energy, MJ/kg 28
70
Embodied Water, L/kg 94
82

Common Calculations

PREN (Pitting Resistance) 11
10
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 15
28 to 73
Strength to Weight: Bending, points 16
24 to 46
Thermal Diffusivity, mm2/s 6.7
9.6
Thermal Shock Resistance, points 15
25 to 66

Alloy Composition

Carbon (C), % 0 to 0.080
0.45 to 0.55
Chromium (Cr), % 10.5 to 11.7
4.8 to 5.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 84.9 to 89.5
87 to 90.5
Manganese (Mn), % 0 to 1.0
0 to 0.5
Molybdenum (Mo), % 0
1.3 to 1.8
Nickel (Ni), % 0 to 0.5
1.3 to 1.8
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 1.0
1.0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0 to 0.75
0
Vanadium (V), % 0
0.8 to 1.4