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SAE-AISI 4620 Steel vs. S40920 Stainless Steel

Both SAE-AISI 4620 steel and S40920 stainless steel are iron alloys. They have 88% of their average alloy composition in common. There are 31 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 4620 steel and the bottom bar is S40920 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 210
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16 to 27
22
Fatigue Strength, MPa 260 to 360
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 320 to 420
270
Tensile Strength: Ultimate (UTS), MPa 490 to 680
430
Tensile Strength: Yield (Proof), MPa 350 to 550
190

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 410
710
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 47
26
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 3.2
6.5
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.6
2.0
Embodied Energy, MJ/kg 22
28
Embodied Water, L/kg 50
94

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100 to 120
78
Resilience: Unit (Modulus of Resilience), kJ/m3 330 to 800
97
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17 to 24
15
Strength to Weight: Bending, points 18 to 22
16
Thermal Diffusivity, mm2/s 13
6.9
Thermal Shock Resistance, points 15 to 20
15

Alloy Composition

Carbon (C), % 0.17 to 0.22
0 to 0.030
Chromium (Cr), % 0
10.5 to 11.7
Iron (Fe), % 96.4 to 97.4
85.1 to 89.4
Manganese (Mn), % 0.45 to 0.65
0 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 1.7 to 2.0
0 to 0.5
Niobium (Nb), % 0
0 to 0.1
Nitrogen (N), % 0
0 to 0.030
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 0.020
Titanium (Ti), % 0
0.15 to 0.5