S890QL1 is a high-strength quenched and tempered structural steel plate with a minimum yield strength of 890 MPa, designed for heavy-duty applications that require exceptional toughness, weldability, and resistance to fatigue and impact. It is commonly used in the construction of large cranes, heavy machinery, offshore structures, and high-rise building components, where reducing weight while maintaining structural integrity is critical. The steel achieves its properties through a carefully controlled thermomechanical rolling process followed by quenching and tempering, resulting in a fine-grained microstructure that provides both high strength and good ductility. S890QL1 is typically supplied with normalized or quenched and tempered conditions, and it meets the requirements of various international standards, making it a reliable choice for demanding engineering projects.
Chemical composition % of steel S890QL1 (1.8925): EN 10025-6-2004
| C | Si | Mn | Ni | P | S | Cr | Mo | V | N | Nb | Ti | Cu | Zr | B | CEV |
| max 0.2 | max 0.8 | max 1.7 | max 2 | max 0.02 | max 0.01 | max 1.5 | max 0.7 | max 0.12 | max 0.015 | max 0.06 | max 0.05 | max 0.5 | max 0.15 | max 0.005 | max 0.82 |
Mechanical properties of steel S890QL1 (1.8925)
| Nominal thickness (mm): | 3 - 50 | 50 - 100 |
| Rm - Tensile strength (MPa) | 940-1100 | 880-1100 |
| Nominal thickness (mm): | 3 - 50 | 50 - 100 |
| ReH - Minimum yield strength (MPa) | 890 | 830 |
| KV - Impact energy (J) longitud., | 0° 60 |
-20° 50 |
-40° 40 |
-60° 30 |
| A - Min. elongation Lo = 5,65 √ So (%) | 11 |
Equivalent grades of steel S890QL1 (1.8925)
| EU EN |
Germany DIN,WNr |
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| S890QL1 |
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processing
Steelmaking and Refining: S890QL1 starts with melting iron ore and scrap in a steelmaking furnace, followed by secondary refining to adjust chemistry, reduce impurities, and ensure cleanliness.
Casting: The molten steel is cast into slabs, blooms, or billets, which are inspected for internal soundness.
Heating and Thermomechanical Rolling: The slabs are reheated and subjected to controlled rolling (thermomechanical processing) to refine the grain structure and build preliminary strength.
Quenching: After rolling, the plates are rapidly cooled (quenched) using water or polymer to form a hard, fine-grained martensitic microstructure.
Tempering: Quenched plates are tempered at a moderate temperature to relieve residual stress, improve toughness and ductility, and stabilize the final mechanical properties.
Finishing and Inspection: The material undergoes straightening, cutting, surface conditioning, and non-destructive testing (NDT) to ensure dimensional accuracy and consistent quality.
applications
Mobile Cranes and Heavy Lifting Equipment:
Used for boom sections, outriggers, and load-bearing structures where high strength and low weight are essential.
Offshore Structures:
Applied in platforms, jackets, and subsea equipment components that require excellent toughness and fatigue resistance.
Heavy Machinery and Earthmoving Equipment:
Utilized in frames, arms, and chassis of excavators, bulldozers, and mining machinery.
High-Rise and Large-Span Buildings:
Used for critical structural members such as columns, beams, and trusses to reduce weight while maintaining structural integrity.
Bridge Construction:
Employed in long-span bridges and bridge components that demand high strength and durability under dynamic loads.
Pressure Vessels and Storage Tanks:
Suitable for thick-walled vessels and tanks operating under high pressure or in harsh environments.
Railway and Transportation Equipment:
Used in freight wagons, locomotive components, and high-load transport structures.
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 maximum carbon content in S890QL1?
The maximum carbon content in S890QL1 is 0.20%. Low carbon content improves weldability and reduces the risk of hardening, ensuring the steel remains tough after processing.
Is S890QL1 suitable for mining equipment?
Yes, S890QL1 is ideal for mining equipment. Its high strength and impact toughness resist abrasion and impact from rocks, extending the service life of mining machinery components.
Does S890QL1 have corrosion resistance?
S890QL1 has moderate atmospheric corrosion resistance. For harsh corrosive environments, additional protection like painting, galvanizing, or coating is recommended to extend service life.
What is the difference between S890QL1 and S890QL?
The main difference is impact toughness: S890QL1 has a minimum impact energy of 30 J at -20°C, while S890QL has 40 J. Both meet EN 10025-6 but suit different low-temperature requirements.
Can S890QL1 be cold-formed?
S890QL1 can be cold-formed with caution. Due to its high strength, it has lower ductility than mild steel, so gradual forming and proper tooling are needed to avoid cracking.
What is the delivery condition of S890QL1?
S890QL1 is delivered in quenched and tempered (Q&T) condition. This heat treatment process refines the microstructure, ensuring consistent high strength and toughness throughout the material.
Does S890QL1 contain nickel?
Yes, S890QL1 may contain up to 1.00% nickel. Nickel improves the steel's toughness and low-temperature performance, making it suitable for cold-climate applications.
What is the thermal conductivity of S890QL1?
The thermal conductivity of S890QL1 is about 45 W/(m·K) at room temperature. This property affects heat distribution during welding and heat treatment processes.
What post-weld heat treatment is recommended for S890QL1?
Stress relief annealing at 550-650°C is recommended for S890QL1 after welding. This reduces residual stresses, improves joint toughness, and prevents premature failure under cyclic loads.