Materials / Compare
Steel AISI 1045 vs. Steel A992
Compare Steel AISI 1045 vs. Steel A992 strength, stiffness, weight and thermal properties.
| Try it on a partA bracket to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | 531MPasourceproducer-stated, cold drawn | 385MPasourcetypical: mean of 20,295 A992 flange mill-test coupons (1998 SSPC survey), as reported by AISC |
| Ultimate tensile strength | 627MPasourceproducer-stated, cold drawn | 505MPasourcetypical: mean of 20,295 A992 flange mill-test coupons (1998 SSPC survey) |
| Elongation at break | 12%sourcein 2 in (50.8 mm) | not sourced |
| Young's modulus (stiffness) | 210GPasourcetypical | 200GPasourcedesign value (AISC 360-16) |
| Density | 7,800kg/m³sourcetypical | 7,850kg/m³sourcenominal (constructional data) |
| Strength to weight | 68.1kN·m/kg39% higher | 49kN·m/kg |
| Stiffness to weight | 26.9MN·m/kg6% higher | 25.5MN·m/kg |
| Poisson's ratio | 0.3sourcetypical | 0.3sourcedesign value (AISC 360-16 Commentary) |
| Shear modulus | 80.8GPa5% stiffer in shear | 76.9GPa |
| Bulk modulus | 175GPa | 167GPa |
| Speed of sound | 5,189m/s | 5,048m/s |
| Thermal | ||
| Thermal conductivity | 40–45W/m·Ksourcetypical range, ambient | 48W/m·Ksourcenominal at 20 °C |
| Thermal expansion | 12µm/m·Ksourcetypical, mean 20-300 °C | 12µm/m·Ksourcenominal (constructional data, no temperature range stated) |
| 100 mm part over a 50 °C swing | 60µm growth | 60µm growth |
| Specific heat | 460–480J/kg·Ksourcetypical range, 50/100 °C | 460–480J/kg·Ksourcebase material: EN S275JR unalloyed structural steel (the EN counterpart of A36), typical, 50/100 °C |
| Heats up and cools (diffusivity) | 11.6mm²/s | 13mm²/s12% faster |
| Thermal shock resistance | 6,269W/m16% more resistant | 5,390W/m |
| Values for | AISI 1045 cold drawn bar (Niagara LaSalle) for mechanical; Ovako C45 (lists 'SAE 1045' as a similar designation) for physical constants | 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. |
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Is Steel AISI 1045 stronger than Steel A992?
Steel AISI 1045 is stronger: its yield strength is 531 MPa against 385 MPa for Steel A992 (38%).
Which is lighter, Steel AISI 1045 or Steel A992?
Steel AISI 1045 is lighter: 7,800 kg/m³ against 7,850 kg/m³ for Steel A992.
Which is stiffer, Steel AISI 1045 or Steel A992?
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 AISI 1045 or Steel A992?
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 AISI 1045 | Steel A992 |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 6% heavier |
| Stiff beam (bending) | lighter | 3% heavier |
| Stiff panel or plate | lighter | 2% heavier |
| Strong rod or tie | lighter | 39% heavier |
| Strong beam | lighter | 25% heavier |
| Strong panel or plate | lighter | 18% 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).
Which conducts heat better, Steel AISI 1045 or Steel A992?
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 AISI 1045 expands less: 12 µm/m·K against 12 µm/m·K for Steel A992.