S890QL is a high-strength quenched and tempered structural steel known for its excellent toughness and good weldability. It is used in heavy engineering applications where high load capacity and reliable performance are required, such as crane booms, heavy machinery, and offshore structures. Its fine-grained microstructure provides strength and durability while allowing for reduced material thickness and weight in structural designs.
Chemical Composition – EN10025 S890QL.
| C | Si | Mn | P | S | B | Cr | Cu | Mo | N | Nb | Ni | Ti | V | Zr |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.20 | 0.80 | 1.70 | 0.020 | 0.010 | 0.005 | 1.50 | 0.50 | 0.70 | 0.015 | 0.06 | 2.0 | 0.05 | 0.12 | 0.15 |
Mechanical properties – EN10025 S890QL.
| Plate thickness mm | Yield strength Reh (MPA) | Tensile strength Rm (MPA) | Elongation A5 % minimum | Impact strength J, minimum |
|---|---|---|---|---|
| 3mm to 50mm | 890 | 940 – 1000 | 11 | 30 @ -40º C |
| 50mm to 100mm | 830 | 880 – 1100 | 11 | 30 @ -40º C |
applications
Crane booms and mobile crane structures
S890QL is extensively used in crane booms and the main load‑bearing structures of mobile cranes. Its high strength allows designers to reduce the thickness of the boom sections, resulting in lighter overall weight while maintaining the required lifting capacity and structural stability. The steel's good toughness also helps withstand the dynamic and cyclic loads experienced during lifting operations, even in cold environments.
Large lifting equipment and heavy‑duty machine frames
The material is a common choice for large lifting equipment and heavy‑duty machine frames where high load‑bearing capacity and long‑term durability are essential. Its combination of strength and toughness ensures reliable performance under heavy static and dynamic loads, making it suitable for use in various types of industrial machinery and construction equipment.
Offshore platforms and marine components
In the offshore industry, S890QL is used for platforms and related structural components that must endure harsh conditions such as high stresses, corrosive environments, and low temperatures. Its excellent toughness helps prevent brittle fracture, a critical requirement for structures operating in offshore settings.
Bridge sections and high‑load bearing members
The steel is applied in bridge construction, particularly in load‑bearing members and sections where high strength allows for more efficient designs with reduced weight. This not only lowers material and construction costs but also improves the overall structural performance of the bridge.
Heavy truck chassis and specialized transport equipment
S890QL is used in heavy truck chassis and specialized transport vehicles where weight reduction is important for improving fuel efficiency and increasing payload capacity. Its high strength ensures the chassis can withstand heavy loads and harsh road conditions.
Mining and earthmoving equipment
The material is employed in mining machinery and earthmoving equipment that operates under extreme conditions. Its robustness and ability to resist wear and impact make it suitable for components subject to heavy use and demanding working environments.
Weight‑sensitive high‑strength structures
S890QL is often specified for structures where reducing weight without compromising strength is a key design goal. Its high strength‑to‑weight ratio makes it ideal for a wide range of applications requiring both performance and efficiency.
Get an valued quotation for S890QL, Contact GNEE Steel.
What is S890QL?
S890QL is a high-strength quenched and tempered structural steel known for its excellent toughness, good weldability, and fine-grained microstructure.
What are the key properties of S890QL?
It offers high yield and tensile strength, good toughness even at low temperatures, excellent weldability, and a fine-grained structure that provides durability and resistance to brittle fracture.
How is S890QL produced?
It is produced through a controlled quenching and tempering process, which refines the grain structure and achieves the desired combination of high strength and toughness.
What are the typical applications of S890QL?
Common applications include crane booms, mobile crane structures, offshore platforms, heavy machinery frames, bridge components, heavy truck chassis, and mining equipment.
Why is S890QL used in crane booms?
Its high strength allows for lighter boom designs without reducing lifting capacity, while its toughness ensures reliable performance under dynamic and cyclic loads.
Is S890QL suitable for welding?
Yes, S890QL has good weldability, although proper preheating and interpass temperature control are often recommended to maintain mechanical properties.
What standards cover S890QL?
S890QL is typically specified under European standards for quenched and tempered fine-grained structural steels.
In what way is S890QL more efficient than traditional heavy‑gauge steel in machine frames?
It provides the same or higher rigidity with less material, reducing overall weight and improving energy efficiency compared to heavier conventional steel frames.
How does S890QL contrast with quenched‑only high‑strength steels?
Unlike quenched‑only steels, which can be brittle, S890QL is tempered to balance high strength with good ductility and toughness.
Why is S890QL a better choice than lower‑strength Q steels in weight‑critical structures?
Its superior strength‑to‑weight ratio allows designers to reduce section sizes more effectively than lower‑strength Q steels, leading to lighter and more economical structures.