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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Sources6 documents: American Institute of Steel Construction, Niagara LaSalle, Ovako, bauforumstahl (ArcelorMittal)
Steel A992
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.
Steel AISI 1045
AISI 1045 cold drawn bar (Niagara LaSalle) for mechanical; Ovako C45 (lists 'SAE 1045' as a similar designation) for physical constants
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Updating Standard Shape Material Properties Database for Design and ReliabilityAmerican Institute of Steel Constructionarchived copySteel A992 · Yield strength: typical: mean of 20,295 A992 flange mill-test coupons (1998 SSPC survey), as reported by AISCSteel A992 · Ultimate tensile strength: typical: mean of 20,295 A992 flange mill-test coupons (1998 SSPC survey)Steel A992 · Elongation at break: typical: mean of 24,847 A992 mill-test elongations, web and flange (1998 SSPC mill data), as reported by AISC
Environmental Product Declaration: Structural Steel Sections and Merchant Bars (2023)bauforumstahl (ArcelorMittal)archived copySteel A992 · Density: nominal (constructional data)Steel A992 · Thermal conductivity: nominal at 20 °CSteel A992 · Thermal expansion: nominal (constructional data, no temperature range stated)
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S275JR Steel GradeOvakoSteel A992 · Specific heat: base material: EN S275JR unalloyed structural steel (the EN counterpart of A36), typical, 50/100 °C
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 Steel A992 stronger than Steel AISI 1045?
Steel AISI 1045 is stronger: its yield strength is 531 MPa against 385 MPa for Steel A992 (38%).
Which is lighter, Steel A992 or Steel AISI 1045?
Steel AISI 1045 is lighter: 7,800 kg/m³ against 7,850 kg/m³ for Steel A992.
Which is stiffer, Steel A992 or Steel AISI 1045?
Steel AISI 1045 is stiffer: Young's modulus 210 GPa against 200 GPa for Steel A992, so the same part in Steel AISI 1045 deflects less under the same load.
Which is lighter for the same job, Steel A992 or Steel AISI 1045?
For the same stiffness or strength: Steel AISI 1045 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
Steel A992
Steel AISI 1045
Stiff rod or tie (tension)
6% heavier
lighter
Stiff beam (bending)
3% heavier
lighter
Stiff panel or plate
2% heavier
lighter
Strong rod or tie
39% heavier
lighter
Strong beam
25% heavier
lighter
Strong panel or plate
18% 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, Steel A992 or Steel AISI 1045?
Steel A992 stretches further before it breaks: 24.2% elongation at break against 12% for Steel AISI 1045.
Thermal
Which conducts heat better, Steel A992 or Steel AISI 1045?
Steel A992 conducts heat better: 48 W/m·K against 42.5 W/m·K for Steel AISI 1045.
Which expands less with temperature?
Steel A992 expands less: 12 µm/m·K against 12 µm/m·K for Steel AISI 1045.