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SAE-AISI 4621 Steel vs. S64512 Stainless Steel

Both SAE-AISI 4621 steel and S64512 stainless steel are iron alloys. They have 86% 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 S64512 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
330
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 27
17
Fatigue Strength, MPa 270
540
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Shear Strength, MPa 320
700
Tensile Strength: Ultimate (UTS), MPa 500
1140
Tensile Strength: Yield (Proof), MPa 360
890

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 410
750
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 46
28
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
4.1

Otherwise Unclassified Properties

Base Metal Price, % relative 3.3
10
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
3.3
Embodied Energy, MJ/kg 22
47
Embodied Water, L/kg 50
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
180
Resilience: Unit (Modulus of Resilience), kJ/m3 340
2020
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
40
Strength to Weight: Bending, points 18
31
Thermal Diffusivity, mm2/s 12
7.5
Thermal Shock Resistance, points 15
42

Alloy Composition

Carbon (C), % 0.18 to 0.23
0.080 to 0.15
Chromium (Cr), % 0
11 to 12.5
Iron (Fe), % 96.1 to 97.1
80.6 to 84.7
Manganese (Mn), % 0.7 to 0.9
0.5 to 0.9
Molybdenum (Mo), % 0.2 to 0.3
1.5 to 2.0
Nickel (Ni), % 1.7 to 2.0
2.0 to 3.0
Nitrogen (N), % 0
0.010 to 0.050
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.025
Vanadium (V), % 0
0.25 to 0.4