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AISI 446 Stainless Steel vs. S81921 Stainless Steel

Both AISI 446 stainless steel and S81921 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 94% of their average alloy composition in common. There are 33 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 446 stainless steel and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
260
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 23
29
Fatigue Strength, MPa 200
370
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
79
Shear Strength, MPa 360
460
Tensile Strength: Ultimate (UTS), MPa 570
710
Tensile Strength: Yield (Proof), MPa 300
500

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 440
430
Maximum Temperature: Mechanical, °C 1180
990
Melting Completion (Liquidus), °C 1510
1430
Melting Onset (Solidus), °C 1430
1390
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
14
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.4
2.9
Embodied Energy, MJ/kg 35
41
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 27
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
180
Resilience: Unit (Modulus of Resilience), kJ/m3 230
630
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 21
25
Strength to Weight: Bending, points 20
23
Thermal Diffusivity, mm2/s 4.6
4.0
Thermal Shock Resistance, points 19
20

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.030
Chromium (Cr), % 23 to 27
19 to 22
Iron (Fe), % 69.2 to 77
66.7 to 75.9
Manganese (Mn), % 0 to 1.5
2.0 to 4.0
Molybdenum (Mo), % 0
1.0 to 2.0
Nickel (Ni), % 0 to 0.75
2.0 to 4.0
Nitrogen (N), % 0 to 0.25
0.14 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030