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AISI 384 Stainless Steel vs. S21900 Stainless Steel

Both AISI 384 stainless steel and S21900 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 87% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is AISI 384 stainless steel and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
220
Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
78
Tensile Strength: Ultimate (UTS), MPa 480
710

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 910
980
Melting Completion (Liquidus), °C 1420
1400
Melting Onset (Solidus), °C 1380
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
14
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 20
15
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 3.7
3.0
Embodied Energy, MJ/kg 52
43
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 16
25
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
26
Strength to Weight: Bending, points 17
23
Thermal Diffusivity, mm2/s 4.3
3.8
Thermal Shock Resistance, points 11
15

Alloy Composition

Carbon (C), % 0 to 0.040
0 to 0.080
Chromium (Cr), % 15 to 17
19 to 21.5
Iron (Fe), % 60.9 to 68
59.4 to 67.4
Manganese (Mn), % 0 to 2.0
8.0 to 10
Nickel (Ni), % 17 to 19
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030