S890QL is a quenched and tempered high-strength structural steel grade defined in the European standard EN 10025‑6. It is part of the S series of structural steels, known for its very high yield strength and good toughness, especially at low temperatures.
Chemical Composition of S890QL
| % | |
|---|---|
| C | 0.20 |
| Si | 0.80 |
| Mn | 1.70 |
| P | 0.020 |
| S | 0.010 |
| N | 0.015 |
| B | 0.0050 |
| Cr | 1.50 |
| Cu | 0.50 |
| Mo | 0.70 |
| Nb | 0.06 |
| Ni | 2.0 |
| Ti | 0.05 |
| V | 0.12 |
| Zr | 0.15 |
Mechanical Properties of S890QL
| 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 | |||
| S890QL | 1.8983 | 890 | 830 | -- | 940/1100 | 880/1100 | -- | 11 |
V Notch Impact Testing
| Grade | Sample Orientation | @ 0 Deg C | @ -20 Deg C | @ -40 Deg C | @ -60 Deg C |
|---|---|---|---|---|---|
| S890QL | Longitudinal | 50J | 40J | 30J | |
| Transverse | 35J | 30J | 27J |
Key Applications of S890QL
Lifting & Handling Equipment
S890QL is widely used in mobile cranes, loader cranes, telescopic booms, aerial work platforms, and various load-handling devices. Its high strength-to-weight ratio allows manufacturers to reduce the weight of booms and structural components while maintaining or increasing lifting capacity, improving fuel efficiency and maneuverability. The steel's good toughness and fatigue resistance also help ensure long-term reliability under repeated lifting and dynamic loading conditions.
Construction
In the construction industry, S890QL is employed in the fabrication of long-span bridges, heavy structural members for high-rise buildings, and large-scale facilities such as aircraft hangars and exhibition centers. It is particularly suitable for critical structural parts subjected to heavy static and dynamic loads, wind forces, and seismic activity. By using S890QL, engineers can optimize structural designs, reduce material consumption, and enhance overall structural performance and durability.
Transportation
S890QL finds application in articulated dump trucks, heavy-duty trailers, low-loaders, and specialized transport containers. Its high strength enables the construction of lighter yet stronger chassis, frames, and body structures, which helps improve payload capacity and reduce operating costs. The steel's toughness and impact resistance also make it suitable for vehicles operating on rough terrain or in harsh environments.
Mining & Earthmoving
Within the mining and earthmoving sector, S890QL is used for manufacturing buckets, blade structures, frames, and other heavy-duty components of excavators, loaders, and mining trucks. Its combination of high strength and good toughness allows these parts to withstand severe impact, abrasion, and extreme loading conditions commonly encountered in mining and construction sites, thereby extending equipment service life.
Energy & Oil/Gas
In the energy and oil/gas industries, S890QL is utilized in hydraulic systems, offshore platforms, subsea structures, and pressure vessel components. Its ability to maintain high strength and toughness at low temperatures and under high-pressure conditions makes it suitable for harsh offshore and onshore environments. The steel's weldability also facilitates the fabrication of large and complex structures required in these sectors.
Agricultural Machinery
S890QL is also applied in heavy-duty agricultural machinery such as combine harvesters, large tractors, and farming equipment frames. By providing a high strength-to-weight ratio, it helps reduce the overall weight of the machines while increasing their structural rigidity and resistance to heavy loads and impact during field operations, contributing to improved efficiency and durability.
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What is the chemical composition characteristic of S890QL?
S890QL is a low-carbon, low-alloy steel with controlled amounts of manganese, chromium, molybdenum, and microalloying elements such as niobium and vanadium. This composition ensures high strength, good toughness, and improved weldability compared to conventional high-strength steels.
What is the impact toughness requirement of S890QL?
S890QL typically requires a minimum impact energy of 27 J at temperatures down to −50 °C, depending on the thickness and specific standard requirements, ensuring good resistance to brittle fracture in cold environments.
What heat treatment process is applied to S890QL?
S890QL is supplied in the quenched and tempered (QT) condition. The steel is heated to a suitable temperature, quenched in water or oil, and then tempered to achieve the desired combination of high strength and toughness.
How does S890QL perform in fatigue applications?
S890QL exhibits good fatigue resistance due to its fine-grained microstructure and high yield strength. This makes it suitable for components subjected to repeated loading, such as crane booms and chassis structures.
What is the difference between S890QL and S890Q?
Both grades have a minimum yield strength of 890 MPa and are quenched and tempered, but S890QL offers improved low-temperature toughness (down to −50 °C), while S890Q typically has toughness requirements only down to −20 °C.
How does S890QL compare to ASTM A514 grade steel?
ASTM A514 is a quenched and tempered high-strength steel with a minimum yield strength of 690 MPa, lower than S890QL's 890 MPa. S890QL provides higher strength and better low-temperature toughness, while A514 is more commonly used in North American fabrication and structural applications.
What is the difference in formability between S890QL and S700MC?
S700MC is a thermomechanically rolled steel with better formability and weldability compared to S890QL. S890QL, being a quenched and tempered grade, offers higher strength but requires more careful forming and welding procedures.
How does S890QL compare to stainless steel in structural applications?
Stainless steel provides excellent corrosion resistance but has lower strength and higher cost than S890QL. S890QL is preferred for weight-sensitive, high-load structures where corrosion resistance can be achieved through coatings or other protection methods.
What are the typical thickness ranges available for S890QL?
S890QL is commonly produced in thicknesses from 6 mm up to around 150 mm, with mechanical properties adjusted according to thickness to maintain consistent strength and toughness.
What surface protection methods are commonly used for S890QL?
Common surface protection methods for S890QL include shot blasting, priming, painting, and galvanizing. These treatments help prevent corrosion and extend the service life of components exposed to harsh environments.