S690QL1 is a high-strength, quenched and tempered (Q+T) structural steel plate, specified under European standard EN 10025-6. It offers a minimum yield strength of 690 MPa and excellent toughness, even at very low temperatures (down to -60°C for S690QL1), making it ideal for heavy-duty, load-bearing applications in construction, heavy machinery (cranes, trucks, mining equipment), and bridges. The "S" denotes Structural steel, "690" is the yield strength in MPa, "Q" means quenched and tempered, and "L1" signifies its enhanced low-temperature impact toughness.
Chemical Properties Of s690ql1 steel plate:
| 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 Of s690ql1 steel plate:
| Plate thicknessmm | ReMPa | RmMPa | A% |
| ≤ 50 | 690 | 770 – 940 | 14 |
| > 50 ≤ 100 | 650 | 760 – 930 | 14 |
| > 100 | 630 | 710 – 900 | 14 |
Notch Impact Energy:
| Steel Grade | Position of Samples | 0°C | – 20°C | – 40°C | – 60°C |
| S690Q/MAXIL® 690 Q | LongitudinalTransverse | 40 J30 J | 30 J27 J | - | - |
| S690QL/MAXIL® 690 QL | LongitudinalTransverse | 50 J35 J | 40 J30 J | 30 J27 J | - |
| S690QL1/MAXIL® 690 QL1 | LongitudinalTransverse | 60 J40 J | 50 J35 J | 40 J30 J | 30 J27 J |
Key Characteristics:
High Yield Strength: Offers minimum yield strength of 690 MPa, enabling lighter, stronger designs.
Exceptional Toughness: Maintains good impact resistance even at very low temperatures, crucial for cold climates.
Good Weldability: Can be welded using standard processes (MIG, TIG, etc.), though specific procedures are needed for optimal results.
Fatigue Resistance: Handles cyclic loading well, extending service life.
Weight Reduction: Allows for thinner plates while maintaining strength, reducing material and transport costs.
Quenched & Tempered (Q&T): The heat treatment process (quenching and tempering) is key to achieving its superior mechanical properties.
Fine-Grained Structure: Contributes to its enhanced toughness and fatigue performance.
Application range of S690QL1 steel plate:
S690QL1 steel plate is a high-strength structural steel plate, and used to manufacture plant, general construction and all kinds of construction machinery, such as drilling machines, electric shovels, electric wheel tippers, mining cars, excavators, loaders, bulldozers, all kinds of cranes, coal mine hydraulic supports and other mechanical equipment and other structural parts for mining and all kinds of engineering construction.
If you have project requirements for (S690QL1), 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.
1.What grade of steel is s690Ql1?
S690QL1 is an ultra-high-strength, quenched and tempered structural steel (S690QL1, Material No. 1.8988) under the European standard EN 10025-6 that provides excellent toughness at extremely low temperatures (down to -60°C) with a minimum yield strength of 690 MPa, making it ideal for heavy-duty, load-bearing structures in demanding environments, often used as a high-performance alternative to standard steels.
2.What is the equivalent of S690QL1 steel?
S690QL1 is a European (EN 10025-6) high-strength, quenched, and tempered structural steel, with key equivalents including ASTM A709 Grade 100 (or A514) in the USA, German grades like TStE 690 V, and brand names such as Dillimax 690 E/T or Weldox 700, all offering similar high yield strength (around 690 MPa) and good toughness for demanding applications like cranes, bridges, and heavy machinery.