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SAE-AISI 8642 Steel vs. N08031 Stainless Steel

Both SAE-AISI 8642 steel and N08031 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a modest 35% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8642 steel and the bottom bar is N08031 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 23
45
Fatigue Strength, MPa 270
290
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
81
Shear Strength, MPa 370
510
Tensile Strength: Ultimate (UTS), MPa 580
730
Tensile Strength: Yield (Proof), MPa 380
310

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
460
Thermal Conductivity, W/m-K 39
12
Thermal Expansion, µm/m-K 13
18

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
39
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 1.5
7.1
Embodied Energy, MJ/kg 20
96
Embodied Water, L/kg 50
240

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
270
Resilience: Unit (Modulus of Resilience), kJ/m3 390
230
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20
25
Strength to Weight: Bending, points 20
22
Thermal Diffusivity, mm2/s 10
3.1
Thermal Shock Resistance, points 17
14

Alloy Composition

Carbon (C), % 0.4 to 0.45
0 to 0.015
Chromium (Cr), % 0.4 to 0.6
26 to 28
Copper (Cu), % 0
1.0 to 1.4
Iron (Fe), % 96.6 to 97.8
29 to 36.9
Manganese (Mn), % 0.75 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.15 to 0.25
6.0 to 7.0
Nickel (Ni), % 0.4 to 0.7
30 to 32
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0.15 to 0.35
0 to 0.3
Sulfur (S), % 0 to 0.040
0 to 0.010