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SAE-AISI 8645 Steel vs. S35315 Stainless Steel

Both SAE-AISI 8645 steel and S35315 stainless steel are iron alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 31 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 SAE-AISI 8645 steel and the bottom bar is S35315 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 23
46
Fatigue Strength, MPa 280 to 350
280
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Shear Strength, MPa 380 to 400
520
Tensile Strength: Ultimate (UTS), MPa 600 to 670
740
Tensile Strength: Yield (Proof), MPa 390 to 560
300

Thermal Properties

Latent Heat of Fusion, J/g 250
330
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1370
Melting Onset (Solidus), °C 1420
1330
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
12
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
34
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
5.7
Embodied Energy, MJ/kg 20
81
Embodied Water, L/kg 50
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
270
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
230
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 24
26
Strength to Weight: Bending, points 20 to 22
23
Thermal Diffusivity, mm2/s 10
3.1
Thermal Shock Resistance, points 18 to 20
17

Alloy Composition

Carbon (C), % 0.43 to 0.48
0.040 to 0.080
Cerium (Ce), % 0
0.030 to 0.1
Chromium (Cr), % 0.4 to 0.6
24 to 26
Iron (Fe), % 96.5 to 97.7
33.6 to 40.6
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
34 to 36
Nitrogen (N), % 0
0.12 to 0.18
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
1.2 to 2.0
Sulfur (S), % 0 to 0.040
0 to 0.030