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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Sources7 documents: Outokumpu, American Institute of Steel Construction, bauforumstahl (ArcelorMittal), Steel Construction Institute, Ovako, Carpenter Technology
Stainless Steel 303
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
Steel
Generic structural steel, cited as ASTM A992 (the current US structural grade): ASTM A992 W-shapes; Fy/Fu specified minimums from AISC publications (AISC 360-16 Commentary; Modern Steel Construction); elastic constants AISC 360; physical constants from the bauforumstahl structural-steel EPD, which names A992 among covered product standards.
1
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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Updating Standard Shape Material Properties Database for Design and ReliabilityAmerican Institute of Steel Constructionarchived copySteel · Yield strength: typical: mean of 20,295 A992 flange mill-test coupons (1998 SSPC survey), as reported by AISCSteel · Ultimate tensile strength: typical: mean of 20,295 A992 flange mill-test coupons (1998 SSPC survey)Steel · Elongation at break: typical: mean of 24,847 A992 mill-test elongations, web and flange (1998 SSPC mill data), as reported by AISC
3
ANSI/AISC 360-16 Specification for Structural Steel Buildings, with CommentaryAmerican Institute of Steel Constructionarchived copySteel · Young's modulus (stiffness): design value (AISC 360-16)Steel · Poisson's ratio: design value (AISC 360-16 Commentary)
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Environmental Product Declaration: Structural Steel Sections and Merchant Bars (2023)bauforumstahl (ArcelorMittal)archived copySteel · Density: nominal (constructional data)Steel · Thermal conductivity: nominal at 20 °CSteel · Thermal expansion: nominal (constructional data, no temperature range stated)
5
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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S275JR Steel GradeOvakoSteel · Specific heat: base material: EN S275JR unalloyed structural steel (the EN counterpart of A36), typical, 50/100 °C
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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 Stainless Steel 303 stronger than Steel?
Steel is stronger: its yield strength is 385 MPa against 275 MPa for Stainless Steel 303 (40%).
Which is lighter, Stainless Steel 303 or Steel?
Steel is lighter: 7,850 kg/m³ against 7,900 kg/m³ for Stainless Steel 303.
Which is stiffer, Stainless Steel 303 or Steel?
Stainless Steel 303 is stiffer: Young's modulus 200 GPa against 200 GPa for Steel, so the same part in Stainless Steel 303 deflects less under the same load.
Which is lighter for the same job, Stainless Steel 303 or Steel?
For the same stiffness or strength: Steel is lighter for a strong rod or tie, strong beam, strong panel or plate.
Part that must be
Stainless Steel 303
Steel
Stiff rod or tie (tension)
about equal
about equal
Stiff beam (bending)
about equal
about equal
Stiff panel or plate
about equal
about equal
Strong rod or tie
41% heavier
lighter
Strong beam
26% heavier
lighter
Strong panel or plate
19% heavier
lighter
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).
Which is more ductile, Stainless Steel 303 or Steel?
Stainless Steel 303 stretches further before it breaks: 35% elongation at break against 24.2% for Steel.
Thermal
Which conducts heat better, Stainless Steel 303 or Steel?
Steel conducts heat better: 48 W/m·K against 15 W/m·K for Stainless Steel 303.
Which expands less with temperature?
Steel expands less: 12 µm/m·K against 16 µm/m·K for Stainless Steel 303.