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AISI 444 Stainless Steel vs. SAE-AISI 4820 Steel

Both AISI 444 stainless steel and SAE-AISI 4820 steel are iron alloys. Both are furnished in the annealed condition. They have 79% 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 AISI 444 stainless steel and the bottom bar is SAE-AISI 4820 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
170
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 23
21
Fatigue Strength, MPa 210
260
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Shear Strength, MPa 300
360
Tensile Strength: Ultimate (UTS), MPa 470
570
Tensile Strength: Yield (Proof), MPa 310
370

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 930
410
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 23
51
Thermal Expansion, µm/m-K 10
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 15
4.3
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 3.4
1.8
Embodied Energy, MJ/kg 47
24
Embodied Water, L/kg 130
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
110
Resilience: Unit (Modulus of Resilience), kJ/m3 240
370
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
20
Strength to Weight: Bending, points 17
19
Thermal Diffusivity, mm2/s 6.2
14
Thermal Shock Resistance, points 16
19

Alloy Composition

Carbon (C), % 0 to 0.025
0.18 to 0.23
Chromium (Cr), % 17.5 to 19.5
0
Iron (Fe), % 73.3 to 80.8
94.6 to 95.7
Manganese (Mn), % 0 to 1.0
0.5 to 0.7
Molybdenum (Mo), % 1.8 to 2.5
0.2 to 0.3
Nickel (Ni), % 0 to 1.0
3.3 to 3.8
Niobium (Nb), % 0.2 to 0.8
0
Nitrogen (N), % 0 to 0.035
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 0.030
0 to 0.040
Titanium (Ti), % 0.2 to 0.8
0