S890QL is an ultra-high-strength, quenched and tempered structural steel (HSLA) under the European standard EN 10025-6, known for its exceptional strength (minimum yield strength of 890 MPa) and toughness, making it ideal for demanding applications in heavy machinery, cranes, bridges, and construction where weight reduction and high load-bearing capacity are crucial. The "S" means structural steel, "890" is its yield strength in MPa, "Q" signifies it's quenched and tempered, and "L" denotes low-temperature impact toughness testing.
Chemical Composition for S890QL Steel Plate
|
C |
Si |
Mn |
P |
S |
B |
Cr |
Cu |
Mo |
|
0.20 |
0.80 |
1.70 |
0.020 |
0.010 |
|
1.50 |
0.50 |
0.70 |
|
N |
Nb* |
Ni |
Ti* |
V* |
Zr* |
|||
|
0.015 |
0.06 |
2.0 |
0.05 |
|
0.15 |
Mechanical Properties for S890QL Steel Plate
|
Plate Thickness mm |
Yield Strength ReH (MPa) |
Tensile Strength Rm (MPa) |
Elongation A5 % minimum |
Impact Strength J, Minimum |
|
3 to 50 |
890 |
940 - 1100 |
11 |
30 @ -40º C |
|
> 50 to 100 |
830 |
880 - 1100 |
11 |
30 @ -40º C |
applications
Lifting & Handling Equipment:
Extensively used in mobile cranes, loader cranes, aerial platforms, and load-handling devices. Its high strength-to-weight ratio significantly reduces component weight while maximizing lifting capacity and operational safety.
Construction & Infrastructure:
Applied to bridges, heavy building structural components, and aircraft hangars. It effectively resists heavy static loads, high wind forces, and dynamic stresses through its superior yield strength and toughness.
Transportation:
Ideal for articulated dump trucks, heavy-duty trailers, and specialized transport containers. It boosts payload ratios and enhances vehicle durability under harsh road conditions by utilizing lightweight, high-strength performance.
Mining & Earthmoving:
Adopted in excavator buckets, heavy-duty drilling equipment, and mining machinery. It is engineered to endure severe impact, abrasion, and extreme loading in the most demanding working environments.
Energy, Oil & Gas:
Utilized in hydraulic systems, offshore fabrications, pressure vessels, and hydropower penstocks. It performs reliably under high-pressure conditions and maintains mechanical integrity at low temperatures.
Renewable Energy:
Specifically used for reinforcement sections in wind turbine towers and tidal energy structures. Its fatigue resistance and high strength ensure the longevity of installations facing extreme offshore wind and wave stresses.
Defense & Security:
Employed in specialized vehicle chassis and protective structural components. The material's high yield strength allows for the development of defense equipment that is both lightweight and highly resilient against structural failure.
Agricultural Machinery:
Integrated into the frames of large-scale agricultural equipment. This enhances structural rigidity and operational efficiency while maintaining an optimal strength-weight balance to reduce soil compaction and fuel consumption.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
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 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.
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.
What welding considerations are important for S890QL?Due to its high strength and low-carbon equivalent design, S890QL is generally weldable, but preheating and interpass temperature control are important to prevent cold cracking. Low-hydrogen welding consumables and proper post-weld heat treatment (PWHT) may be required for thick sections or highly restrained joints.
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.
How does S890QL compare to S960QL?
S960QL has a higher yield strength (960 MPa) than S890QL (890 MPa), making it suitable for even more extreme load conditions. S890QL, however, typically provides better toughness, weldability, and fatigue performance, and is often preferred when a balance of strength and fabrication ease is needed.