What is the technical Condition of S690QL Plates?
S690QL plates are ultra-high-strength structural steels (EN 10025-6) delivered in a "Quenched and Tempered (Q+T)" condition, offering a minimum yield strength of 690 MPa, excellent low-temperature toughness (impact tested at -40°C), good weldability, and bendability, enabling lighter, more efficient designs in heavy machinery, construction, and transport. Key technical features include high tensile strength (770-940 MPa), controlled chemical composition, and a microstructure (often bainitic/martensitic) resulting from its specific heat treatment.
S690 QL is a high yield structural steel grade produced in compliance with EN 10025:6:2004. The material is heat treated using the quench and temper process and has good bending and welding properties.
S690QL is a high-strength, quenched and tempered structural steel. It is renowned for its impressive tensile strength and toughness, making it suitable for heavy-duty applications. The "S" stands for structural steel, "690" represents the minimum yield strength in megapascals (MPa), and "QL" indicates the material is of high quality, with excellent low-temperature toughness.
Key Characteristics:
High Strength: A minimum yield strength of 690 MPa (Megapascals) for common thicknesses.
Quenched & Tempered (Q&T): A heat treatment process that enhances its mechanical properties, especially strength and toughness.
Excellent Toughness: Good impact resistance, even in cold conditions, making it suitable for harsh environments.
Good Weldability: Can be readily fabricated and assembled with appropriate welding procedures.
Lightweight Design: Enables engineers to create structures that are lighter, leading to better payload capacity and fuel efficiency.
Common Applications:
Cranes & Lifting Gear: Booms, jibs, and load-bearing components for increased reach and capacity.
Heavy Machinery: Components in mobile equipment.
Construction: Structural elements in bridges, buildings, and other heavy-duty structures.
Offshore Structures: Due to its toughness and corrosion resistance.
Grade Designation
S: Stands for Structural Steel.
690: Indicates the minimum yield strength in MPa.
QL: Denotes that the steel is quenched (Q) and tempered (L, often indicating low-temperature toughness).
What is S690QL standard?
S690QL is a European standard (EN 10025-6) for ultra-high-strength structural steel, known for its excellent combination of high yield strength (minimum 690 MPa), toughness, and weldability, achieved through a quenched and tempered (Q+T) heat treatment. It's used in demanding applications like cranes, heavy machinery, bridges, and wind turbines, allowing for lighter, more efficient designs with increased payload capacity.
Is S690QL steel hard to drill ?
Yes, drilling S690QL (a high-strength quenched and tempered steel) is harder than standard mild steel because of its high yield strength (690 MPa) and hardness, requiring specialized tools like carbide or cobalt bits, slower speeds, and proper cooling to prevent bit wear and maintain material integrity, but it's a standard fabrication process if done correctly.
Is S690QL high speed steel?
No, S690QL is not a high-speed steel; it's a high-strength, low-alloy (HSLA) structural steel, known as a quenched and tempered steel, designed for heavy-duty applications like bridges, cranes, and construction equipment due to its high yield strength (690 MPa) and excellent toughness. High-speed steels are tool steels used for cutting at high speeds (like HSS drills), while S690QL offers superior strength-to-weight for structural purposes, not cutting tools.
S690QL - Chemical Composition
| Element | Percentage % | Element | Percentage % |
| C | 0.20 | Cu | 0.50 |
| Si | 0.80 | Mo | 0.70 |
| Mn | 1.70 | Nb* | 0.06 |
| P | 0.025 | Ni | 2.0 |
| S | 0.015 | Ti* | 0.05 |
| N | 0.015 | V* | 0.12 |
| B | 0.0050 | Zr* | 0.15 |
| Cr | 1.50 |
S690QL - Mechanical Properties
| Designation | Mechanical Properties (ambient temperature) | |||||||
| Steel Name | Steel Number | Min. Yield Strength Reh MPa | Tensile Strength Rm MPa | Min. % elongation after fracture | ||||
| Nominal thickness (mm) | Nominal thickness (mm) | |||||||
| ≥3 ≤50 | ≥50 ≤100 | ≥100 ≤150 | ≥3 ≤50 | ≥50 ≤100 | ≥100 ≤150 | |||
| S690QL | 1.8931 | 690 | 650 | 630 | 770/940 | 760/930 | 710/900 | 14 |
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 |
Equivalent grades of steel S690QL (1.8928)
| EU EN |
USA - |
Germany DIN,WNr |
France AFNOR |
European old EN |
Sweden SS |
Inter ISO |
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1What is the difference between s690ql and s355?
S690QL is a much stronger, high-strength, quenched & tempered steel for heavy-duty applications, while S355 is a standard, milder-strength structural steel (around 355 MPa yield) for general construction, with S690QL offering superior yield strength (around 690 MPa) but requiring careful design to manage its fatigue properties compared to S355's excellent weldability and cost-effectiveness.
2What is s690qL steel comparable to?
S690QL is a high-strength, quenched and tempered structural steel (EN 10025-6) comparable to grades like ASTM A709-100, German TStE690V / DILLIMAX 690, French E690T, Swedish WELDOX 700, and Japanese JFE HITEN 780LE, all offering similar high yield strength (around 690 MPa) for demanding applications in heavy transport, machinery, and construction.
3Is S690QL carbon steel?
Yes, S690QL is considered a high-strength structural steel that contains carbon, but it's more accurately described as a low-alloy, high-yield (HY) steel due to controlled additions of other elements (like Manganese, Silicon, Chromium, Molybdenum) for enhanced properties, making it stronger and tougher than plain carbon steel, especially for demanding, cold-temperature applications.
4What is S690ql Plate Thickness?
S690QL plate thickness typically ranges from 8 mm up to 100 mm (or more, sometimes 150 mm), with common available thicknesses including 8, 10, 12, 16, 20, 25, 30, 40, 50, 60, 80, 90, 100 mm, depending on the supplier, and can go even thicker. This high-yield quenched and tempered (Q+T) steel offers varying minimum yield strengths (690 MPa down to 630 MPa) as thickness increases, providing excellent strength and toughness for heavy-duty applications like cranes and mobile equipment,
5What temperature is S690QL?
S690QL is a high-yield structural steel known for its toughness at low temperatures, specifically tested to provide at least 27-30 Joules of impact energy at -40°C, ensuring excellent performance in cold conditions, unlike S690Q which is tested at 0°C. Its name indicates a minimum yield strength of 690 MPa (S for Structural, 690 for strength, Q for Quenched & Tempered, L for Low-temperature impact toughness).
6What is the composition of S690QL?
S690QL is a high-strength structural steel (EN 10025-6) known for its minimum 690 MPa yield strength after quenching and tempering, with key alloying elements like Carbon, Manganese, Silicon, Chromium, Molybdenum, Nickel, and microalloying elements (Nb, Ti, V, Zr) that enhance strength and toughness, making it ideal for heavy machinery, cranes, and construction. Its composition includes typical limits for C (0.2%), Si (0.8%), Mn (1.7%), P (0.025%), S (0.015%), with additions of Cr (1.5%), Mo (0.7%), Ni (2%), Nb (0.06%), Ti (0.05%), V (0.12%), and Zr (0.15%).
7What is the technical Condition of S690QL Plates?
S690QL plates are ultra-high-strength structural steels (EN 10025-6) delivered in a "Quenched and Tempered (Q+T)" condition, offering a minimum yield strength of 690 MPa, excellent low-temperature toughness (impact tested at -40°C), good weldability, and bendability, enabling lighter, more efficient designs in heavy machinery, construction, and transport. Key technical features include high tensile strength (770-940 MPa), controlled chemical composition, and a microstructure (often bainitic/martensitic) resulting from its specific heat treatment.
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