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AISI 440B Stainless Steel vs. SAE-AISI 4320 Steel

Both AISI 440B stainless steel and SAE-AISI 4320 steel are iron alloys. They have 82% of their average alloy composition in common. There are 29 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 AISI 440B stainless steel and the bottom bar is SAE-AISI 4320 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 3.0 to 18
21 to 29
Fatigue Strength, MPa 260 to 850
320
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 460 to 1110
370 to 500
Tensile Strength: Ultimate (UTS), MPa 740 to 1930
570 to 790
Tensile Strength: Yield (Proof), MPa 430 to 1860
430 to 460

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 870
420
Melting Completion (Liquidus), °C 1480
1460
Melting Onset (Solidus), °C 1370
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 23
46
Thermal Expansion, µm/m-K 10
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
3.4
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 2.2
1.7
Embodied Energy, MJ/kg 31
22
Embodied Water, L/kg 120
52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57 to 110
140 to 150
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 27 to 70
20 to 28
Strength to Weight: Bending, points 24 to 45
19 to 24
Thermal Diffusivity, mm2/s 6.1
13
Thermal Shock Resistance, points 27 to 70
19 to 27

Alloy Composition

Carbon (C), % 0.75 to 1.0
0.17 to 0.22
Chromium (Cr), % 16 to 18
0.4 to 0.6
Iron (Fe), % 78.2 to 83.3
95.8 to 97
Manganese (Mn), % 0 to 1.0
0.45 to 0.65
Molybdenum (Mo), % 0 to 0.75
0.2 to 0.3
Nickel (Ni), % 0
1.7 to 2.0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.040

Comparable Variants