Products Description
S690QL is a high-strength structural steel plate in the European standard EN 10025-6. "S" means European standard structural steel, "690" means the minimum yield strength after quenching and tempering is 690MPa, and "QL" means the delivery status is quenched and tempered (quenched and tempered). tempered).
Equivalent to the national standard Q690E, this steel plate usually has good strength, toughness and welding performance, and is suitable for manufacturing low-temperature-resistant, high-strength key components that bear high loads in engineering machinery, mining machinery, building structures and other fields.
Chemical composition % of steel S690QL (1.8928)
| C | Si | Mn | Ni | P | S | Cr | Mo | V | N | Nb | Ti | Cu | Zr | B | CEV |
| max 0.2 | max 0.8 | max 1.7 | max 2 | max 0.02 | max 0.01 | max 1.5 | max 0.7 | max 0.12 | max 0.015 | max 0.06 | max 0.05 | max 0.5 | max 0.15 | max 0.005 | max 0.83 |
Mechanical Properties
Yield Strength: 690 MPa (min) This high yield strength makes S690QL suitable for applications that require strong and durable materials.
Tensile Strength: 770 - 940 MPa The tensile strength is also high, allowing S690QL to resist breaking under tension.
Elongation: 14% (min) for thicknesses up to 16 mm; this percentage decreases slightly with increased thickness Good elongation means the material can deform without breaking, which is important for safety and flexibility in certain applications.
Advantages of S690QL
Good Weldability: With excellent weldability, S690QL steel is easy to fabricate and assemble.
High Strength: S690QL steel is suitable for use in heavy-duty applications that require high strength and durability as it has a high yield strength of 690 MPa.
Toughness: S690QL steel has a high resistance to impact and fatigue thanks to its good toughness, which makes it suitable for use in heavy-duty applications.
Corrosion Resistance: S690QL steel is suitable for use in offshore structures and other applications where exposure to harsh environments is expected as a result of its good corrosion resistance.
Applications
S690QL is widely used in industries that require materials with high strength-to-weight ratios, such as:
Construction: In the manufacturing of cranes, bridges, heavy machinery, and other structural components that need to withstand high loads.
Mining: For the production of mining equipment like excavators, bulldozers, and other heavy machinery.
Energy: Used in applications like wind turbine towers and offshore structures.
Shipbuilding: For creating strong yet lightweight hulls and other parts of ships.
Heat Treatment
S690QL steel is quenched and tempered, which means that it undergoes a heat treatment process that involves heating the steel to a high temperature and then cooling it rapidly (quenching), followed by tempering (reheating to a lower temperature and then cooling). This results in increased strength and toughness.
Quenching: The steel is heated to a specific temperature and then rapidly cooled, which increases the hardness of the material.
Tempering: The steel is then tempered to adjust the hardness and toughness, ensuring that the material is not too brittle for its intended use.
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