S690QL is a high strength quenched and tempered steel grade that complies to steel specification EN 10025. The designation S690QL refers to a minimum yield strength of 690MPa.
Standard:Hot-rolled product made from structural steel. EN 10025-6: Technical delivery conditions for high-tensile structural steel post-tempering and quenching.
Classification: High-grade structural steel.
Chemical Composition
Chemical composition of S690Q steel according EN10025-6, %
| С | Si | Mn | P | S | N | B | Cr | Cu | Mo | Nb | Ni | Ti | V | Zr |
| 0,20 | 0,80 | 1,70 | 0,025 | 0,015 | 0,015 | 0,005 | 1,50 | 0,50 | 0,70 | 0,06 | 2,0 | 0,05 | 0,12 | 0,15 |
Mechanical properties of S690Q steel
| Nominal gauge, mm | Minimum yield strength, ReH (MPa) | Ultimate tensile strength, Rm (MPa) | Minimum elongation ratio σ, % | Brinell hardness number, HB (MPa) |
| >3≤50 | 690 | 770-940 | 14 | 228-278 |
| >50 ≤ 100 | 650 | 760-930 | 14 | 225-276 |
| >100 ≤ 150 | 630 | 710-900 | 14 | 210-266 |
S690QL - V Notch Impact Testing
| Grade | Sample Orientation | @ 0 °C | @-20 °C | @-40 °C | @-60 °C |
|---|---|---|---|---|---|
| S690QL | Longitudinal | 50 J | 40 J | 30 J | ¨C¨C |
| Traverse | 35 J | 30 J | 27 J | ¨C¨C |
S690QL - Applications
Construction and Infrastructure
In the construction industry, S690QL is used for building structures that require high load-bearing capacity and resilience, such as bridges, high-rise buildings, and stadiums. Its ability to withstand heavy loads without compromising structural integrity makes it an invaluable material for infrastructure projects.
Heavy Machinery and Equipment
The manufacturing of heavy machinery, including cranes, earth-moving equipment, and mining machinery, benefits from the high strength and durability of S690QL. It ensures that these machines can operate under extreme conditions and carry heavy loads efficiently.
Transportation and Automotive Industry
In the transportation sector, S690QL is used to produce components for heavy-duty trucks, trailers, and other vehicles that require enhanced strength and durability. Its use leads to safer, more reliable vehicles capable of handling demanding tasks.
Key Features of S690QL Ultra High Strength Steel
Exceptional Strength
High Yield Strength: The most notable feature of S690QL is its high yield strength of 690 MPa. This allows for the creation of lighter and thinner structures without compromising on strength or stability.
Enhanced Toughness: S690QL exhibits excellent toughness, even at low temperatures. This makes it suitable for use in harsh environments where standard steels might fail.
Superior Weldability
Despite its high strength, S690QL maintains good weldability. This is a crucial feature for structural applications, as it allows for the creation of complex structures without the risk of brittle weld joints.
High Ductility
Formability: The steel's high ductility ensures that it can be easily formed and fabricated into various shapes and sizes, meeting diverse engineering requirements.
Resistance to Wear and Tear
S690QL is known for its excellent resistance to abrasion and impact. This makes it ideal for applications where wear and tear are significant concerns, such as mining equipment, heavy machinery, and transportation vehicles.
If you have project requirements for (S690QL), we welcome your inquiry. GNEE maintains a large inventory of commonly used high strength steel grades for your selection.For detailed mechanical properties, chemical composition, and technical data, as well as free samples, please contact our factory immediately. We offer competitive prices, stable quality, and professional service. Email:beam@gneesteelgroup.com.
What is the difference between S690Q and S690QL?
S690Q: Minimum impact toughness tested at -20°C (30J average). → Typical Use: Cranes in temperate climates, quarry equipment. S690QL: Certified for -40°C and below (≥40J impact toughness). → Critical Use: Arctic pipelines, offshore platforms, mining vehicles in Siberia.
What is the equivalent of S690QL steel?
S690QL is a European high-yield structural steel (EN 10025-6) with equivalents like ASTM A709 Grade 100 (USA), German grades such as TStE690V, DILLIMAX 690, NAXTRA 70, French E690T/S690T, and Japanese JFE HITEN 780LE, all offering similar minimum yield strength (690 MPa) and mechanical properties for quenched and tempered applications, though specific standards and trade names vary by region.