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SAE-AISI 8630 Steel vs. S44401 Stainless Steel

Both SAE-AISI 8630 steel and S44401 stainless steel are iron alloys. They have 80% 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 SAE-AISI 8630 steel and the bottom bar is S44401 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 24
21
Fatigue Strength, MPa 260 to 350
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Shear Strength, MPa 340 to 410
300
Tensile Strength: Ultimate (UTS), MPa 540 to 680
480
Tensile Strength: Yield (Proof), MPa 360 to 560
300

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 410
930
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
22
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
12
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.9
Embodied Energy, MJ/kg 20
40
Embodied Water, L/kg 50
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78 to 110
90
Resilience: Unit (Modulus of Resilience), kJ/m3 340 to 840
230
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19 to 24
17
Strength to Weight: Bending, points 19 to 22
18
Thermal Diffusivity, mm2/s 10
5.9
Thermal Shock Resistance, points 18 to 23
17

Alloy Composition

Carbon (C), % 0.28 to 0.33
0 to 0.025
Chromium (Cr), % 0.4 to 0.6
17.5 to 19.5
Iron (Fe), % 96.8 to 97.9
75.1 to 80.6
Manganese (Mn), % 0.7 to 0.9
0 to 1.0
Molybdenum (Mo), % 0.15 to 0.25
1.8 to 2.5
Nickel (Ni), % 0.4 to 0.7
0 to 1.0
Nitrogen (N), % 0
0 to 0.035
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0 to 0.030
Titanium (Ti), % 0
0.2 to 0.8