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S21904 Stainless Steel vs. AISI 444 Stainless Steel

Both S21904 stainless steel and AISI 444 stainless steel are iron alloys. They have 84% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is S21904 stainless steel and the bottom bar is AISI 444 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17 to 51
23
Fatigue Strength, MPa 380 to 550
210
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
78
Shear Strength, MPa 510 to 620
300
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
470
Tensile Strength: Yield (Proof), MPa 390 to 910
310

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 430
580
Maximum Temperature: Mechanical, °C 980
930
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1350
1420
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
23
Thermal Expansion, µm/m-K 17
10

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 15
15
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.0
3.4
Embodied Energy, MJ/kg 43
47
Embodied Water, L/kg 160
130

Common Calculations

PREN (Pitting Resistance) 25
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
95
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
240
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 36
17
Strength to Weight: Bending, points 23 to 29
17
Thermal Diffusivity, mm2/s 3.8
6.2
Thermal Shock Resistance, points 15 to 21
16

Alloy Composition

Carbon (C), % 0 to 0.040
0 to 0.025
Chromium (Cr), % 19 to 21.5
17.5 to 19.5
Iron (Fe), % 59.5 to 67.4
73.3 to 80.8
Manganese (Mn), % 8.0 to 10
0 to 1.0
Molybdenum (Mo), % 0
1.8 to 2.5
Nickel (Ni), % 5.5 to 7.5
0 to 1.0
Niobium (Nb), % 0
0.2 to 0.8
Nitrogen (N), % 0.15 to 0.4
0 to 0.035
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0.2 to 0.8