S890QL is an ultra-high-strength low-alloy structural steel that strictly complies with the European standard EN 10025 - 6 , and its material number is 1.8983. Each letter and number in its grade has a clear technical meaning: "S" represents structural steel; "890" refers to the minimum yield strength of 890 MPa for plates with thickness ≤50mm; "Q" indicates the delivery state is quenched and tempered; and "L" means it can pass the notch toughness test at a low temperature of -40°C. Compared with ordinary structural steel such as S275JR, its strength is increased by 224%, which can effectively reduce the thickness and weight of structural parts while ensuring load-bearing capacity, and it is widely used in multiple heavy-duty fields.
Chemical Composition (mass%, maximum values unless specified)
The composition is precisely proportioned to balance ultra-high strength and processing performance, and harmful elements are strictly limited. The key components are as follows: C ≤0.20, Si ≤0.80, Mn ≤1.70, P ≤0.020, S ≤0.010. It also contains multiple functional alloying elements, including Cr ≤1.50, Ni ≤2.0, Mo ≤0.70, Cu ≤0.50, and B ≤0.005. For grain - refining elements, Nb ≤0.06, Ti ≤0.05, V ≤0.12, and at least 0.015% of these grain - refining elements must be contained to refine the grain structure. Among them, Ni and Cr enhance low-temperature toughness and corrosion resistance, while Mo improves the steel's tempering stability.
Core Advantages
Excellent strength-to-weight ratio: Its ultra-high strength enables structural parts to be designed with thinner thickness. For instance, when used to make crane booms, it can not only lengthen the boom length but also reduce the overall weight of the crane, thereby improving the lifting capacity and operation flexibility.
Good processability: Despite its ultra-high strength, it is relatively easy to weld and form. It can adapt to common welding processes and does not require extremely complex special processes, which reduces the difficulty of processing and manufacturing for enterprises.
Strong environmental adaptability: It can maintain stable performance in extreme working environments such as low temperatures and heavy loads. Whether it is used in cold - region engineering machinery or offshore equipment, it can resist harsh conditions and ensure long-term reliable operation.
Typical Applications
It is a preferred material for many heavy-duty and high-demand fields. In the field of engineering machinery, it is used to manufacture crane booms, bulldozer blades, quarry crushers, and mining truck bodies. In the infrastructure field, it is applied to the load-bearing structures of long-span bridges and super high-rise buildings. In the oil and gas industry, it is used to make special containers and equipment for oil and gas exploration and transportation. Additionally, it is also used in agricultural machinery, aerial work platforms, and military equipment, meeting the performance requirements of various heavy-load and complex working conditions.
Equivalent Grades
It has corresponding alternative grades in different standard systems and market brands, which is convenient for material substitution in cross-border projects. In the market, it is equivalent to Dillimax 890 and Weldox 900. In China, it is roughly equivalent to Q890E in the national standard, and it can also be referenced to JFE Hiten 980, providing multiple choices for project material selection.
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.