Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
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1.4305 / UNS S30300, Outokumpu typical values (hot rolled, solution annealed) from 'Steel Grades, Properties and Global Standards'; max service from Carpenter CarTech 303 datasheet
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Steel Grades, Properties and Global StandardsOutokumpuarchived copyStainless Steel 303 · Yield strength: Outokumpu typical (product P = hot rolled plate, transverse)Stainless Steel 303 · Ultimate tensile strength: Outokumpu typicalStainless Steel 303 · Elongation at break: Outokumpu typical, A5Stainless Steel 303 · Young's modulus (stiffness): at RT (Table 12)Stainless Steel 303 · Density: at RTStainless Steel 303 · Thermal conductivity: at RTStainless Steel 303 · Thermal expansion: mean, 20–100 °CStainless Steel 303 · Specific heat: at RT
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Ceramic Seal Material Properties (01899 F)CoorsTekarchived copyCeramic Alumina 96% · Ultimate tensile strength: typical tensile strength, 25 °C (ACMA Test #4)Ceramic Alumina 96% · Compressive strength: typical, 20 °C (ASTM-C773)Ceramic Alumina 96% · Flexural strength: flexural strength (MOR), 20 °C (ASTM-F417)Ceramic Alumina 96% · Young's modulus (stiffness): typical, 20 °C (ASTM-C848)Ceramic Alumina 96% · Density: typical (ASTM-C20)Ceramic Alumina 96% · Poisson's ratio: typical, 20 °C (ASTM-C848)Ceramic Alumina 96% · Thermal conductivity: typical, 20 °C (ASTM-C408)Ceramic Alumina 96% · Thermal expansion: mean, 25-1000 °C (ASTM-C372)Ceramic Alumina 96% · Specific heat: typical, 100 °C (ASTM-E1269)
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Design Manual for Structural Stainless Steel, 4th Edition (P413)Steel Construction Institutearchived copyStainless Steel 303 · Poisson's ratio: design value (structural stainless steels)
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Carpenter Stainless Type 303 Data SheetCarpenter Technologyarchived copyStainless Steel 303 · Max service temperature: continuous, scaling limit
Each number points to the document that states it, with the exact basis. Values without a number are computed from the sourced ones. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Mechanical
Is Ceramic Alumina 96% stronger than Stainless Steel 303?
Stainless Steel 303 is stronger: its yield strength is 275 MPa against tensile strength 221 MPa for Ceramic Alumina 96% (24%).
Which is lighter, Ceramic Alumina 96% or Stainless Steel 303?
Ceramic Alumina 96% is lighter: 3,720 kg/m³ against 7,900 kg/m³ for Stainless Steel 303.
Which is stiffer, Ceramic Alumina 96% or Stainless Steel 303?
Ceramic Alumina 96% is stiffer: Young's modulus 303 GPa against 200 GPa for Stainless Steel 303, so the same part in Ceramic Alumina 96% deflects less under the same load.
Which is lighter for the same job, Ceramic Alumina 96% or Stainless Steel 303?
For the same stiffness or strength: Ceramic Alumina 96% is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
Part that must be
Ceramic Alumina 96%
Stainless Steel 303
Stiff rod or tie (tension)
lighter
3.22x heavier
Stiff beam (bending)
lighter
2.61x heavier
Stiff panel or plate
lighter
2.44x heavier
Strong rod or tie
lighter
1.71x heavier
Strong beam
lighter
1.84x heavier
Strong panel or plate
lighter
1.9x heavier
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Thermal
Which conducts heat better, Ceramic Alumina 96% or Stainless Steel 303?
Ceramic Alumina 96% conducts heat better: 24.7 W/m·K against 15 W/m·K for Stainless Steel 303.
Which expands less with temperature?
Ceramic Alumina 96% expands less: 8.2 µm/m·K against 16 µm/m·K for Stainless Steel 303.