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SAE-AISI 4621 Steel vs. S44800 Stainless Steel

Both SAE-AISI 4621 steel and S44800 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 67% 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 4621 steel and the bottom bar is S44800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
190
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 27
23
Fatigue Strength, MPa 270
300
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
82
Shear Strength, MPa 320
370
Tensile Strength: Ultimate (UTS), MPa 500
590
Tensile Strength: Yield (Proof), MPa 360
450

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 410
1100
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 46
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 3.3
19
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
3.8
Embodied Energy, MJ/kg 22
52
Embodied Water, L/kg 50
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
120
Resilience: Unit (Modulus of Resilience), kJ/m3 340
480
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
21
Strength to Weight: Bending, points 18
20
Thermal Diffusivity, mm2/s 12
4.6
Thermal Shock Resistance, points 15
19

Alloy Composition

Carbon (C), % 0.18 to 0.23
0 to 0.010
Chromium (Cr), % 0
28 to 30
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 96.1 to 97.1
62.6 to 66.5
Manganese (Mn), % 0.7 to 0.9
0 to 0.3
Molybdenum (Mo), % 0.2 to 0.3
3.5 to 4.2
Nickel (Ni), % 1.7 to 2.0
2.0 to 2.5
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.2
Sulfur (S), % 0 to 0.040
0 to 0.020