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SAE-AISI 8645 Steel vs. AISI 304L Stainless Steel

Both SAE-AISI 8645 steel and AISI 304L stainless steel are iron alloys. They have 72% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8645 steel and the bottom bar is AISI 304L stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
160 to 350
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 23
6.7 to 46
Fatigue Strength, MPa 280 to 350
170 to 430
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 380 to 400
370 to 680
Tensile Strength: Ultimate (UTS), MPa 600 to 670
540 to 1160
Tensile Strength: Yield (Proof), MPa 390 to 560
190 to 870

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 410
540
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
16
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
16
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
3.1
Embodied Energy, MJ/kg 20
44
Embodied Water, L/kg 50
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
71 to 240
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
92 to 1900
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 24
19 to 41
Strength to Weight: Bending, points 20 to 22
19 to 31
Thermal Diffusivity, mm2/s 10
4.2
Thermal Shock Resistance, points 18 to 20
12 to 25

Alloy Composition

Carbon (C), % 0.43 to 0.48
0 to 0.030
Chromium (Cr), % 0.4 to 0.6
18 to 20
Iron (Fe), % 96.5 to 97.7
65 to 74
Manganese (Mn), % 0.75 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
8.0 to 12
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0.15 to 0.35
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030

Comparable Variants