FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
LADHANI METAL CORPORATION, MUMBAI, INDIA
Introduction
EN 10025-6 is a European standard covering
high-strength structural steels supplied in the quenched and tempered
condition. These steels are engineered for extremely demanding structural
applications where very high yield strength, excellent toughness, and
resistance to fatigue and impact loading are essential.
The grades covered under EN 10025-6 allow significant
weight reduction without compromising structural integrity, making them ideal
for heavy engineering, offshore, mining, lifting equipment, and high-load
infrastructure projects. Depending on thickness and grade, EN 10025-6 steels
are supplied in sheet, plate, coil, and strip forms.
Applicable Standards and Specifications
Standard: EN 10025-6
Material Type: High-strength quenched and tempered structural steel
Product Forms: Sheet, plate, coil, strip
Manufacturing Process: Hot Rolled
Delivery Condition: +QT (Quenched and Tempered)
EN 10025-6 steels are fully compliant with European
structural and engineering design requirements for high-strength applications.
Available Grades of EN 10025-6 Structural Steel
The following grades are covered under this
specification:
S690QL
S690QL1
S690QL2
S890QL
S890QL1
S960QL
The suffix “QL” indicates quenched and tempered steel
with guaranteed impact toughness at low temperatures. QL1 and QL2 grades
provide enhanced low-temperature impact performance for severe service
conditions.
Chemical Composition of EN 10025-6 Structural Steel
(%)
S690QL / S690QL1 / S690QL2
|
Element |
Composition (%) |
|
|
Carbon (C) |
0.20 max |
|
|
Manganese (Mn) |
1.70 max |
|
|
Phosphorus (P) |
0.020 max |
|
|
Sulfur (S) |
0.010 max |
|
|
Silicon (Si) |
0.80 max |
|
|
Chromium (Cr) |
1.50 max |
|
|
Nickel (Ni) |
2.00 max |
|
|
Molybdenum (Mo) |
0.70 max |
|
|
Boron (B) |
0.005 max |
|
S890QL / S890QL1
|
Element |
Composition (%) |
|
Carbon (C) |
0.22 max |
|
Manganese (Mn) |
1.80 max |
|
Phosphorus (P) |
0.020 max |
|
Sulfur (S) |
0.010 max |
|
Silicon (Si) |
0.80 max |
|
Chromium (Cr) |
1.60 max |
|
Nickel (Ni) |
2.00 max |
|
Molybdenum (Mo) |
0.80 max |
|
Boron (B) |
0.005 max |
S960QL
|
Element |
Composition (%) |
|
Carbon (C) |
0.24 max |
|
Manganese (Mn) |
1.80 max |
|
Phosphorus (P) |
0.020 max |
|
Sulfur (S) |
0.010 max |
|
Silicon (Si) |
0.80 max |
|
Chromium (Cr) |
1.80 max |
|
Nickel (Ni) |
2.00 max |
|
Molybdenum (Mo) |
0.90 max |
|
Boron (B) |
0.005 max |
Note: Alloying elements such as nickel, chromium,
molybdenum, and boron ensure hardenability, strength, and toughness after
quenching and tempering.
Mechanical Properties of EN 10025-6 Structural Steel
|
Grade |
Yield Strength (MPa) |
Tensile Strength (MPa) |
Elongation (%) |
|
S690QL / QL1 / QL2 |
≥ 690 |
770 – 940 |
≥ 14 |
|
S890QL / QL1 |
≥ 890 |
940 – 1100 |
≥ 12 |
|
S960QL |
≥ 960 |
980 – 1150 |
≥ 11 |
Impact toughness requirements:
QL grades: tested at −40°C
QL1 grades: tested at −60°C
QL2 grades: tested at −60°C with stricter impact energy requirements
Physical Properties (Typical)
Density: approximately 7.85 g/cm³
Melting Point: approximately 1425 – 1540°C
Thermal Conductivity: approximately 35 – 45 W/m·K
Modulus of Elasticity: approximately 200 GPa
Thickness, Width, and Size Range
Sheet thickness: 2 mm to 8 mm
Plate thickness: 6 mm to 200 mm
Coil thickness: 2 mm to 25 mm
Strip width: from 10 mm onwards
Maximum width: up to 3500 mm
Length: up to 12000 mm or cut-to-length
Availability depends on grade, thickness, and mill
capability.
Key Features of EN 10025-6 Steel Sheet / Plate / Coil
/ Strip
Ultra High Yield Strength
Exceptional yield strength enables major weight reduction in structures while
maintaining high safety margins.
Quenched and Tempered Microstructure
Controlled heat treatment provides an optimal balance of strength, hardness,
and toughness.
Excellent Low-Temperature Impact Toughness
QL, QL1, and QL2 grades ensure reliable performance in extremely cold and
offshore environments.
High Fatigue and Impact Resistance
Ideal for dynamic, cyclic, and shock-loaded applications such as cranes and
heavy lifting equipment.
Optimized Weldability for High-Strength Steel
Low carbon equivalent allows welding with controlled procedures and suitable
consumables.
Dimensional Stability During Fabrication
Reduced residual stresses minimize distortion during cutting and welding
operations.
Wide Strength Range for Design Optimization
Grades from S690 to S960 allow engineers to select the most efficient strength
level for each application.
Weldability and Fabrication
EN 10025-6 steels can be welded using SMAW, GMAW,
FCAW, and SAW processes. Preheating and controlled heat input are strongly
recommended, particularly for thicker sections and higher-strength grades.
Post-weld heat treatment may be required depending on service conditions.
Machinability
Machinability is moderate to difficult due to very
high strength. Carbide tools, reduced cutting speeds, and effective cooling are
essential for efficient machining.
Corrosion Resistance
These steels offer limited inherent corrosion
resistance and should be protected using painting, galvanizing, or advanced
coating systems in outdoor or marine environments.
Typical Applications of EN 10025-6 Steel Sheet / Plate
/ Coil / Strip
Heavy Lifting and Structural Engineering
Cranes, booms, and lifting arms
Heavy-duty load-bearing frames
Offshore and Marine Structures
Offshore platforms and jackets
Structural components for harsh marine environments
Mining and Earthmoving Equipment
Excavator arms and structural frames
Energy and Power Sector
Wind turbine towers and nacelle frames
Hydropower and power plant structures
Transportation and Infrastructure
High-strength bridges and viaducts
Truck, trailer, and transport chassis
Defense and Specialized Engineering
High-impact structural components
Non-ballistic armored structures
Conclusion
EN 10025-6 Structural Steel Sheet, Plate, Coil, and
Strip in grades S690QL, S690QL1, S690QL2, S890QL, S890QL1, and S960QL deliver
outstanding strength, toughness, and reliability for extreme structural
applications. These quenched and tempered steels enable lighter, stronger, and
more efficient designs in heavy engineering, offshore, mining, and energy
sectors, ensuring long-term performance under the most demanding conditions.
For customized sizes, grade selection, or technical assistance, contact Ladhani Metal Corporation.
FOR REQUIREMENT OF THIS GRADE OR FOR DETAIL CONTACT US AT :-
Product Link:
https://www.ladhanimetal.in/products/en-10025-6-s960ql-steel-plate/3299
https://www.ladhanimetal.in/products/en-10025-6-s890ql1-steel-sheet/3298
https://www.ladhanimetal.in/products/en-10025-6-s690ql2-steel-coil/3296
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