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SAE-AISI 8645 Steel vs. N08700 Stainless Steel

Both SAE-AISI 8645 steel and N08700 stainless steel are iron alloys. They have 50% 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 N08700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
170
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 23
32
Fatigue Strength, MPa 280 to 350
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
79
Shear Strength, MPa 380 to 400
410
Tensile Strength: Ultimate (UTS), MPa 600 to 670
620
Tensile Strength: Yield (Proof), MPa 390 to 560
270

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
13
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
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
32
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 1.5
6.0
Embodied Energy, MJ/kg 20
82
Embodied Water, L/kg 50
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
160
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
180
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21 to 24
21
Strength to Weight: Bending, points 20 to 22
20
Thermal Diffusivity, mm2/s 10
3.5
Thermal Shock Resistance, points 18 to 20
14

Alloy Composition

Carbon (C), % 0.43 to 0.48
0 to 0.040
Chromium (Cr), % 0.4 to 0.6
19 to 23
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 96.5 to 97.7
42 to 52.7
Manganese (Mn), % 0.75 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.15 to 0.25
4.3 to 5.0
Nickel (Ni), % 0.4 to 0.7
24 to 26
Niobium (Nb), % 0
0 to 0.4
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030