S890QL is a quenched and tempered high-strength low-alloy structural steel that adheres to the European standard EN 10025-6, with a material number of 1.8983. The code has clear technical implications: "S" stands for structural steel; "890" denotes a minimum yield strength of 890 MPa for plates with thickness ≤50mm; "Q" indicates the delivery condition is quenched and tempered; and "L" means it can maintain specified impact energy at a low temperature of no less than -40°C. It is widely used in major projects and heavy-duty equipment manufacturing due to its excellent comprehensive performance.
Chemical Composition (mass%, maximum values except specified)
Its chemical composition is precisely controlled to balance strength and processability. The key components are as follows: C ≤0.18, Si ≤0.50, Mn ≤1.50, P ≤0.025, S ≤0.010. It also contains alloying elements such as Cr ≤0.90, Ni ≤0.40, Mo ≤0.50, and V ≤0.08. Additionally, Cu ≤0.35, Ti ≤0.03, and Nb is controlled between 0.03 - 0.06. The low content of harmful elements like P and S effectively reduces brittleness, while alloy elements enhance the steel's overall mechanical properties.
- Outstanding high-strength and toughness balance: After quenching and tempering, it can withstand heavy loads while resisting brittle fracture in low-temperature environments, which is crucial for equipment operating in cold regions.
- Excellent weldability: The low carbon equivalent design and high-purity smelting process ensure it can be smoothly welded by manual or automatic welding methods without obvious performance degradation of weld joints.
Good processing adaptability: It can undergo hot forming at 750 - 1050°C and cold forming with proper post-processing. For parts with large cold deformation, subsequent quenching and tempering or stress relief treatment can restore performance stability.
- Construction and bridge engineering: Used for main beams of long-span bridges, structural frames of high-rise buildings, and key support components.
- Engineering machinery: Manufactures structural parts of cranes, excavators, loaders, and hydraulic supports for coal mines.
Special equipment and marine engineering: Applied in offshore platforms, hull structures, heavy-duty mining trucks, and special vehicle components, which can reduce the weight of structural parts while ensuring load-bearing capacity.
Equivalent Grades
It has corresponding alternative grades in different standard systems. Internationally, it corresponds to the grade FGS90WV. In China, it is roughly equivalent to Q890E in the national standard. Meanwhile, it can be referenced to grades such as Dillimax 890 and Weldox 900 in the market.
What is the meaning of S890QL grade and its applicable standard?
It's an EN10025-6 structural steel. "S"=structural steel, "890"=890MPa yield strength, "Q"=quenched-tempered, "L"=low-temperature toughness.
What are the key chemical and mechanical property indicators of S890QL?
C≤0.19%, P≤0.020%, S≤0.010%; ReH≥890MPa, Rm=940-1100MPa, -40℃ impact energy ≥30J.
What are the requirements for delivery condition and surface quality of S890QL?
Delivered quenched-tempered; no harmful defects like cracks. Special requirements need to be specified in the contract.
What processing methods suit S890QL and what precautions should be taken?
Flame/plasma/laser cutting available; preheat before welding, control cold bending radius, stress relief annealing optional.
In which fields is S890QL mainly applied?
It's widely used in heavy machinery, bridge construction, oil derricks, port cranes and mining equipment under harsh conditions.
What is the core difference between S890QL and S890Q?
S890QL has "L" for low-temperature toughness (-40℃), while S890Q only meets 0℃/-20℃ impact requirements.