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S21640 Stainless Steel vs. AISI 446 Stainless Steel

Both S21640 stainless steel and AISI 446 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 89% of their average alloy composition in common. There are 33 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 S21640 stainless steel and the bottom bar is AISI 446 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 46
23
Fatigue Strength, MPa 320
200
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 78
79
Shear Strength, MPa 520
360
Tensile Strength: Ultimate (UTS), MPa 740
570
Tensile Strength: Yield (Proof), MPa 350
300

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 490
440
Maximum Temperature: Mechanical, °C 940
1180
Melting Completion (Liquidus), °C 1430
1510
Melting Onset (Solidus), °C 1380
1430
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 17
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 17
12
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.6
2.4
Embodied Energy, MJ/kg 51
35
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 26
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 280
110
Resilience: Unit (Modulus of Resilience), kJ/m3 300
230
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 27
21
Strength to Weight: Bending, points 23
20
Thermal Diffusivity, mm2/s 4.0
4.6
Thermal Shock Resistance, points 16
19

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.2
Chromium (Cr), % 17.5 to 19.5
23 to 27
Iron (Fe), % 63 to 74.3
69.2 to 77
Manganese (Mn), % 3.5 to 6.5
0 to 1.5
Molybdenum (Mo), % 0.5 to 2.0
0
Nickel (Ni), % 4.0 to 6.5
0 to 0.75
Niobium (Nb), % 0.1 to 1.0
0
Nitrogen (N), % 0.080 to 0.3
0 to 0.25
Phosphorus (P), % 0 to 0.060
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030