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AISI 409 Stainless Steel vs. SAE-AISI 8645 Steel

Both AISI 409 stainless steel and SAE-AISI 8645 steel are iron alloys. They have 89% of their average alloy composition in common. There are 30 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 AISI 409 stainless steel and the bottom bar is SAE-AISI 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 24
12 to 23
Fatigue Strength, MPa 140
280 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Shear Strength, MPa 270
380 to 400
Tensile Strength: Ultimate (UTS), MPa 420
600 to 670
Tensile Strength: Yield (Proof), MPa 200
390 to 560

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 710
410
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 25
39
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
2.6
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.0
1.5
Embodied Energy, MJ/kg 28
20
Embodied Water, L/kg 94
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
77 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 100
420 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 15
21 to 24
Strength to Weight: Bending, points 16
20 to 22
Thermal Diffusivity, mm2/s 6.7
10
Thermal Shock Resistance, points 15
18 to 20

Alloy Composition

Carbon (C), % 0 to 0.080
0.43 to 0.48
Chromium (Cr), % 10.5 to 11.7
0.4 to 0.6
Iron (Fe), % 84.9 to 89.5
96.5 to 97.7
Manganese (Mn), % 0 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0 to 0.5
0.4 to 0.7
Phosphorus (P), % 0 to 0.045
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Titanium (Ti), % 0 to 0.75
0