S960QL is a European standard ultra-high-strength structural steel known for its exceptional strength (minimum yield strength of 960 MPa) and excellent toughness, achieved through a quenching and tempering (Q) process with specified low-temperature impact energy (L). This lightweight, durable steel is ideal for heavy-duty applications in mobile and fixed structures like cranes, mining equipment, and bridges, allowing for significant weight reduction while maintaining structural integrity.
Chemical composition % of steel S960QL
| 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 0.82 |
Mechanical properties of steel S960QL
| Nominal thickness (mm): | 3 - 50 |
| Rm - Tensile strength (MPa) | 980-1150 |
| Nominal thickness (mm): | 3 - 50 |
| ReH - Minimum yield strength (MPa) | 960 |
| KV - Impact energy (J) longitud., | 0° 50 |
-20° 40 |
-40° 30 |
| A - Min. elongation Lo = 5,65 √ So (%) | 10 |
Equivalent grades of steel S960QL
| EU EN |
Germany DIN,WNr |
France AFNOR |
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| S960QL |
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applications
Mobile crane booms and telescopic arms:
Its high yield strength allows designers to reduce section sizes and overall weight, improving lifting capacity and fuel efficiency.
Heavy-duty truck and trailer components:
Used for chassis beams, cross members, and suspension parts where high load capacity and durability are essential.
Offshore structures:
Applied in platforms, jackets, and subsea equipment where high strength and resistance to low-temperature brittle fracture are required.
Mining and construction machinery:
Used in hydraulic support frames, loader arms, and excavator components that experience heavy impact and cyclic loading.
Bridge and structural engineering:
Employed in heavily loaded trusses, beams, and joints to reduce structure weight while maintaining safety margins.
Armor and protective structures:
Used in military vehicles and security barriers due to its high strength and energy absorption capability.
Power generation equipment:
Applied in wind turbine towers, generator frames, and other components where high strength and fatigue resistance are important.
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What are the main applications of S960QL?
S960QL is commonly used in heavy lifting equipment such as crane booms, telescopic arms, and other high-performance structural components. It is also found in offshore structures, mining machinery, and heavy truck parts where high strength and low weight are critical.
Why is S960QL suitable for crane booms?
Its high strength allows designers to create lighter and more efficient boom structures while maintaining load-carrying capacity. This reduces overall machine weight, improves mobility, and increases lifting performance.
How does S960QL perform in low-temperature environments?
S960QL is designed to maintain good toughness at low temperatures, making it suitable for use in cold climates or offshore applications where materials must withstand impact loading without brittle failure.
Is S960QL weldable?
Yes, S960QL is weldable, but due to its high strength and alloy content, proper welding procedures are necessary. These may include preheating, controlled interpass temperatures, and appropriate consumables to avoid cold cracking and ensure good toughness in the heat-affected zone.
What welding methods are used for S960QL?
Common methods include shielded metal arc welding, gas metal arc welding, and submerged arc welding. The choice depends on material thickness, production conditions, and required weld quality, with a qualified welding procedure specification always recommended.
What heat treatment is applied to S960QL?
S960QL undergoes quenching and tempering. Quenching forms a hard microstructure, while tempering reduces hardness and internal stresses, resulting in the desired strength–toughness balance.
How does S960QL compare to S690QL?
S960QL has a significantly higher yield strength than S690QL, enabling greater weight reduction in structural designs. However, it may have slightly lower ductility and toughness and requires more stringent welding and fabrication controls. S690QL is easier to process and is used where extremely high strength is not essential.
How does S960QL compare to standard carbon steels?
Compared to conventional carbon steels, S960QL offers much higher strength and better low-temperature toughness due to its alloy content and fine-grained microstructure. However, it requires more careful handling during welding and heat treatment to maintain its properties.
How does S960QL compare to stainless steels?
S960QL has a much higher yield strength than most standard stainless steels, making it better suited for weight-sensitive, high-load structures. Stainless steels, however, provide superior corrosion resistance, so S960QL is often used with protective coatings when corrosion is a concern.
What are the advantages of using S960QL?
Key advantages include very high strength, good low-temperature toughness, and the ability to reduce structural weight. This leads to more efficient designs, lower material usage, and improved performance in heavy machinery and lifting equipment.
What are the limitations of using S960QL?
Limitations include higher material and production costs compared to lower-strength steels. Welding and fabrication require greater expertise and stricter process control to prevent cracking and maintain properties. Thicker sections may also show reduced toughness, requiring careful grade selection and inspection.
How does the price of S960QL compare to other structural steels?
S960QL is generally more expensive than standard structural steels and even some high-strength grades due to its complex chemical composition, precise manufacturing processes, and stringent quality control. Prices can also vary based on factors such as thickness, supplier, order volume, and market demand. Compared to lower-strength quenched and tempered steels, S960QL typically commands a significant premium due to its much higher strength level and performance.