High Quality Q&T Steel & S690QL Sheets & Plates
S690QL • Formable • Ductile • Machinable
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S690QL
- High-strength quenched & tempered structural steel
- Minimum yield strength: 690 MPa
- Tensile strength: 770–940 MPa
- Excellent strength-to-weight ratio
- Fine-grained low-alloy steel
- Good weldability with low carbon equivalent
- High impact toughness (tested at -40°C)
- Used in cranes, heavy machinery, bridges
The materials we supply undergo a comprehensive range of quality assurance procedures, including eddy current testing, hydrostatic testing, ultrasonic examination, and other essential NDT methods, along with detailed chemical and mechanical property evaluations. Each product is thoroughly inspected at multiple stages of manufacturing to ensure it is free from defects and suitable for demanding industrial applications. Our rigorous testing standards guarantee consistent quality and reliability. In addition, all products are manufactured in accordance with relevant industry norms and specifications, making them fully compliant and widely accepted in both domestic and international markets.
Quenched & Tempered Steel Plates Specifications
| Standard | ASTM A514/A709 |
|---|---|
| Thickness | 6mm to 100mm |
| Width | 1,500mm to 2,500mm |
| Length | 6,000mm to 12,000mm |
| Production | Hot-Rolled (HR) / Cold-Rolled (CR) |
| Heat Treatment | N, Q+T |
| Surface Paint | EP, PE, HDP, SMP, PVDF |
S690QL PLATES EQUIVALENT GRADES
| GRADE | S690QL EN10137-2 EN10025-6:2004 | A709-100 | TSIE690V DILLIMAX 690 NAXTRA 70 | E690T E690TFP S690T | FeE690VKT | 2625 WELDOX 700 | E690 | JFE HITEN 780LE | ALFORM 700 |
|---|---|---|---|---|---|---|---|---|---|
| STANDARDS | EN | ASTM | DIN, WNr | AFNOR/NF A36-204 | EN | SS | ISO 4952 | JJS | |
| COUNTRY | EUROPE | USA | GERMANY | FRANCE | EUROPEAN (OLD) | SWEDEN | INTER | JAPAN | AUSTRIA |
EN 10025 S690QL Plates Specifications
| Thickness | 6mm to 100mm |
|---|---|
| Width | 1,500mm to 2,500mm |
| Length | 6,000mm to 12,000mm |
| Production | Hot-Rolled (HR) / Cold-Rolled (CR) |
| Heat Treatment | N, Q+T |
| Surface Paint | EP, PE, HDP, SMP, PVDF |
CHEMICAL COMPOSITION OF S690QL HIGH STRENGTH STEEL PLATES
| C | Si | Mn | P | S | B | Cr | Cu | Mo |
|---|---|---|---|---|---|---|---|---|
| 0.20 | 0.80 | 1.70 | 0.020 | 0.010 | 0.005 | 1.50 | 0.50 | 0.70 |
| N | Nb* | Ni | Ti* | V* | Zr* | |||
|---|---|---|---|---|---|---|---|---|
| 0.015 | 0.06 | 2.0 | 0.05 | 0.12 | 0.15 |
MECHANICAL PROPERTIES OF S690QL PLATES & SHEETS
| Plate Thickness mm | Yield Strength Reff (MPa) | Tensile Strength Rm (MPa) | Elongation A5 % minimum | Impact Strength J. Minimum |
|---|---|---|---|---|
| 3 to 50 | 690 | 770 – 940 | 14 | 30 @ -40°C |
| > 50 to 100 | 650 | 760 – 930 | 14 | 30 @ -40°C |
| > 100 to 150 | 630 | 710 – 900 | 14 | 30 @ -40°C |
💡 Practical Difference in Use
Use S690QL when: extremely high strength, reduced weight, and superior toughness are required for demanding structural and load-bearing applications.
→ Example: cranes, lifting equipment, heavy machinery structures, mobile equipment frames, and high-strength welded components.
Use Conventional Structural Steel when: moderate strength is sufficient, and cost efficiency is more important than weight reduction.
→ Example: general structural fabrication, low-stress platforms, machinery bases, and standard engineering applications.
Use Other Q&T Grades (e.g., S700MC/S960QL) when: even higher strength levels or specific low-temperature performance is required beyond S690QL capabilities.
→ Example: ultra-high-performance cranes, defense equipment, and advanced load-bearing structures.
Applications of Quenched & Tempered S690QL Plates
S690QL Plates are engineered for high-load structural applications where exceptional strength, toughness, and weight optimization are critical. These plates deliver superior fatigue performance and weldability, making them ideal for advanced engineering and heavy machinery fabrication.
- High-Strength Structural Components: Used in cranes, lifting booms, large machine frames, and structural supports requiring very high yield strength.
- Heavy Machinery & Industrial Equipment: Ideal for construction machines, mining equipment structures, and mobile equipment chassis.
- Weight-Sensitive Designs: Suitable for applications where reducing structure weight improves operational efficiency and safety.
When to Choose S690QL vs. Other Structural Steels?
Your selection depends on required strength levels, design weight constraints, weldability, toughness, and cost considerations.
Choose S690QL when:
- Very high yield strength (≥ 690 MPa) is required
- Weight reduction is essential without compromising strength
- Excellent toughness is needed for dynamic loads
- Good weldability with controlled heat input is required
- Applications include cranes, heavy machinery, and offshore structures
Choose Standard Structural Steel (e.g., S355/S275) when:
- Moderate strength is sufficient for the application
- Budget-friendly material is preferred
- Welding simplicity is a priority
- Used for general fabrication and structural construction
- Low to medium stress levels are expected
Choose Higher Grades (e.g., S700MC/S960QL) when:
- Strength requirements exceed 690 MPa
- Critical weight-sensitive designs are involved
- Advanced engineering applications demand superior fatigue resistance
- Used in defense vehicles, advanced cranes, and special-purpose machinery
- Higher performance is needed under extreme load conditions
Industries That Use S690QL Plates
S690QL is widely utilized across industries that depend on high-strength structural components, lightweight designs, and equipment exposed to dynamic and cyclic loading.
Relies heavily on S690QL for load-bearing and structural components.
Uses
Crane booms, excavator arms, telescopic structures, heavy machine frames.
Why S690QL?
High strength-to-weight ratio improves performance and reduces material weight.
S690QL is a preferred material due to its superior yield strength and fatigue resistance.
Uses
Lattice booms, outriggers, lifting chassis, mobile crane structures.
Why S690QL?
Ensures high load capacity while maintaining low structural weight.
Used in harsh offshore environments where toughness and weldability are crucial.
Uses
Platform structures, support beams, subsea equipment frameworks.
Why S690QL?
High toughness ensures durability under low-temperature and dynamic load conditions.
Utilized in machinery exposed to heavy stress cycles and shock loading.
Uses
Loader arms, truck chassis, mining equipment frames.
Why S690QL?
Superior fatigue resistance increases service life of heavy machinery.
Used in vehicle components requiring high strength with reduced weight.
Uses
Trailers, tippers, high-strength truck frames.
Why S690QL?
Boosts payload capacity and enhances vehicle performance and efficiency.
Used in structural and load-bearing applications within power plants.
Uses
Support structures, turbine platforms, heavy maintenance equipment.
Material Selection
S690QL for high-stress designs, standard steels for general support structures.
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