| High yield steels are found in numerous applications | | | | S - refers to structural grade steel |
| including heavy load bearing applications such as | | | | 690 - minimum yield strength (MPa) |
| heavy transports, cranes and lifting equipment and | | | | Q - quenched and tempered |
| structural frameworks. The sourcing of suitable steel | | | | L - low notch toughness testing temperature of -40 |
| products with high yield and tensile strength is | | | | Degrees C |
| therefore an important consideration to ensure that | | | | The hardening process applied to the steel reduces |
| any specified material is up to the task. | | | | the risks of brittle fracture. S690QL is supplied as |
| S690QL is a high yield fine grain structural steel grade | | | | heavy plates and as welded steel sections with |
| which is engineered specifically for heavy load bearing | | | | carbon plates up to 60mm in thickness. The demands |
| applications. The steel is hardened using the | | | | for high yield and high strength steel is constantly |
| 'quenched and tempered' method and has a variety | | | | evolving with harder and stronger steels coming onto |
| of beneficial characteristics. The material displays high | | | | the supply market all the time. |
| tensile and yield strength with a minimum yield | | | | Cost Benefits |
| strength of 690Mpa. Grades can be be produced up | | | | It is a known fact that using high strength steels in a |
| in 1300Mpa as in S1300QL. Good welding properties | | | | project can save the customer money. It affords the |
| are another feature (using conventional welding | | | | opportunity for the use of lesser thicknesses whilst |
| methods), coupled with good bending and forming | | | | being able to provide the same load bearing |
| qualities. | | | | capabilities of more standard structural steel grades. |
| S690QL - Description of Designation | | | | |