S890QL1 is a quenched and tempered high-strength structural steel grade covered by the European standard EN 10025‑6. The designation indicates that it is intended for structural applications, supplied in the quenched and tempered condition, and provides enhanced toughness at low temperatures. It is a low-alloy steel with carefully controlled chemistry to achieve a balance of high strength, good toughness, and acceptable weldability, making it suitable for heavy-duty components and structures that must perform reliably even in very cold environments.
Chemical Composition
|
C |
Si |
Mn |
Ni |
P |
S |
Cr |
Mo |
V |
N |
Nb |
Ti |
Cu |
Zr |
B |
|
max 0.2 |
max 0.8 |
max 1.7 |
max 2 |
max 0.025 |
max 0.015 |
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 |
Mechanical Properties
|
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 |
|||
|
S890QL1 |
1.8925 |
890 |
830 |
–– |
940/1100 |
880/1100 |
–– |
11 |
applications
Cranes and Lifting Equipment
S890QL1 is widely used in heavy‑duty crane structures and lifting equipment, where its high strength and good toughness allow designers to reduce component weight while maintaining the required load‑carrying capacity and safety margins.
Construction and Mining Machinery
It is also a preferred material for critical load‑bearing parts in construction and mining machinery, such as boom sections, chassis components, and support structures, because it can withstand dynamic and impact loads under harsh working conditions.
Offshore Structures
In the offshore industry, S890QL1 is employed for structures exposed to severe environmental conditions, including low temperatures and corrosive atmospheres, where reliable performance and resistance to brittle fracture are essential.
Bridge Construction
The steel is used in bridge construction for components that demand high strength combined with good fatigue resistance, helping to achieve more efficient and economical designs for both new bridges and strengthening projects.
Transportation Industry
Within the transportation sector, S890QL1 finds application in heavy truck frames and other weight‑sensitive structural parts, where its high strength enables weight reduction and improved fuel efficiency without compromising durability.
Industrial Machinery
It is also utilized for pressure‑resistant and wear‑resistant components in various industrial machines, such as hydraulic supports, large‑scale presses, and material handling equipment, where it provides long service life under high stress.
Low‑Temperature Applications
Additionally, S890QL1 is specified for specialized structures operating in extremely low‑temperature environments, where its enhanced low‑temperature toughness helps prevent brittle failure and ensures structural integrity.
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What standard defines S890QL1?
S890QL1 is defined by the European standard EN 10025‑6, which covers high-strength structural steels in the quenched and tempered condition.
What does the designation "S890QL1" mean?
"S" indicates structural steel, "890" refers to the minimum yield strength level, "Q" denotes quenched and tempered delivery, and "L1" signifies improved low-temperature toughness requirements.
What are the key mechanical properties of S890QL1?
S890QL1 offers high yield and tensile strength, good ductility, and excellent toughness, especially at low temperatures, making it suitable for demanding load-bearing applications.
What is the typical chemical composition characteristic of S890QL1?
It is a low-alloy steel with controlled carbon content and additions of elements such as chromium, nickel, molybdenum, and sometimes vanadium or boron to enhance strength and toughness.
In what delivery condition is S890QL1 supplied?
S890QL1 is supplied in the quenched and tempered condition, which involves heating to a high temperature, rapid cooling, and subsequent tempering to achieve the desired strength and toughness balance.
What are the main applications of S890QL1?
It is commonly used in heavy-duty crane structures, construction and mining machinery, offshore structures, bridge components, heavy truck frames, and specialized equipment operating in low-temperature environments.
Why is S890QL1 suitable for low-temperature service?
Its "L1" designation indicates improved toughness at low temperatures, reducing the risk of brittle fracture and ensuring reliable performance in cold climates.
How does S890QL1 compare to S890Q and S890QL?
All three grades have similar strength levels, but S890QL1 provides the highest level of low-temperature toughness, followed by S890QL, with S890Q offering the lowest toughness among the three.
What fabrication considerations apply to S890QL1?
Due to its high strength, proper welding procedures, preheating, and interpass temperature control are important to avoid cracking and ensure good joint quality. Machining is generally feasible but requires appropriate tooling and parameters.
What quality control measures are common for S890QL1?
Typical requirements include ultrasonic testing to detect internal flaws, mechanical testing (tensile, impact, hardness), and verification of chemical composition and heat treatment records to ensure compliance with the standard.