Materials / Compare
Steel AISI 1018 vs. Steel A992
Compare Steel AISI 1018 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 | 372MPasourceproducer-stated, cold drawn | 385MPasourcetypical: mean of 20,295 A992 flange mill-test coupons (1998 SSPC survey), as reported by AISC |
| Ultimate tensile strength | 441MPasourceproducer-stated, cold drawn | 505MPasourcetypical: mean of 20,295 A992 flange mill-test coupons (1998 SSPC survey) |
| Elongation at break | 15%sourcein 2 in (50.8 mm) | not sourced |
| Young's modulus (stiffness) | 200GPasourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) | 200GPasourcedesign value (AISC 360-16) |
| Density | 7,861kg/m³sourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) | 7,850kg/m³sourcenominal (constructional data) |
| Strength to weight | 47.3kN·m/kg | 49kN·m/kg4% higher |
| Stiffness to weight | 25.4MN·m/kg | 25.5MN·m/kg |
| Poisson's ratio | 0.32sourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) | 0.3sourcedesign value (AISC 360-16 Commentary) |
| Shear modulus | 75.7GPa | 76.9GPa2% stiffer in shear |
| Bulk modulus | 185GPa | 167GPa |
| Speed of sound | 5,043m/s | 5,048m/s |
| Thermal | ||
| Thermal conductivity | 51.9W/m·Ksourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) | 48W/m·Ksourcenominal at 20 °C |
| Thermal expansion | 12µm/m·Ksourcebase material: unalloyed carbon steel, Ovako family table (S275JR, 'none alloyed structural steels', C <= 0.21%); 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 | 486J/kg·Ksourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018) | 460–480J/kg·Ksourcebase material: EN S275JR unalloyed structural steel (the EN counterpart of A36), typical, 50/100 °C |
| Heats up and cools (diffusivity) | 13.6mm²/s4% faster | 13mm²/s |
| Thermal shock resistance | 5,473W/m2% more resistant | 5,390W/m |
| Values for | AISI 1018 cold drawn bar (Niagara LaSalle, cold-finished bar producer) | 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 1018 stronger than Steel A992?
Steel A992 is stronger: its yield strength is 385 MPa against 372 MPa for Steel AISI 1018 (3%).
Which is lighter, Steel AISI 1018 or Steel A992?
Steel A992 is lighter: 7,850 kg/m³ against 7,861 kg/m³ for Steel AISI 1018.
Which is stiffer, Steel AISI 1018 or Steel A992?
Steel A992 is stiffer: Young's modulus 200 GPa against 200 GPa for Steel AISI 1018, so the same part in Steel A992 deflects less under the same load.
Which is lighter for the same job, Steel AISI 1018 or Steel A992?
For the same stiffness or strength: Steel A992 is lighter for a strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Steel AISI 1018 | Steel A992 |
|---|---|---|
| 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 | 4% heavier | lighter |
| Strong beam | 2% heavier | lighter |
| Strong panel or plate | 2% 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 conducts heat better, Steel AISI 1018 or Steel A992?
Steel AISI 1018 conducts heat better: 51.9 W/m·K against 48 W/m·K for Steel A992.
Which expands less with temperature?
Steel AISI 1018 expands less: 12 µm/m·K against 12 µm/m·K for Steel A992.