EN10025-6 S960QL High Strength Structural Steel Coil
EN10025-6 S960QL High Strength Structural Steel Coil - Ultra-High Strength & Toughness
Detailed material properties, chemical composition, mechanical and physical performance data for S960QL carbon and low-alloy high-strength steel coil per EN10025-6.
Cold forming, bending, welding, machining, cutting, hot forming (limited)
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EN10025-6 S960QL High Strength Structural Steel Coil Introduction
S960QL is a quenched and tempered high-strength structural steel grade defined in EN 10025-6. It belongs to the carbon and low-alloy high-strength steel family, offering a minimum yield strength of 960 MPa and excellent toughness at low temperatures down to -40°C (L-quality). The steel is designed for heavy-duty welded structures where weight reduction and high load-bearing capacity are critical. Typical delivery condition is quenched + tempered (Q+T). The material is available as coils, sheets, and plates with a thickness range up to 150 mm. Its fine-grained microstructure combined with precise alloying provides a balanced combination of ultra-high strength, good ductility, and reliable weldability when appropriate preheating and welding procedures are followed.
EN10025-6 S960QL High Strength Structural Steel Coil Chemical Composition
Maximum limits unless otherwise stated. Elements like Al are minimum required for grain refinement. All values are in line with EN 10025-6:2019 for grade S960QL. The steel is microalloyed with Nb, V, Ti to achieve fine grain and high strength after quenching and tempering.
| Element | Standard Value (max, %) | Remarks |
|---|---|---|
| C | 0.20 | Carbon, max |
| Si | 0.80 | Silicon, max |
| Mn | 1.70 | Manganese, max |
| P | 0.020 | Phosphorus, max |
| S | 0.010 | Sulfur, max |
| Al total | ≥0.015 | Minimum total aluminum for grain refinement |
| Nb | 0.06 | Niobium, max |
| V | 0.12 | Vanadium, max |
| Ti | 0.05 | Titanium, max |
| Cr | 1.50 | Chromium, max |
| Ni | 2.0 | Nickel, max |
| Mo | 0.70 | Molybdenum, max |
| Cu | 0.50 | Copper, max |
| B | 0.005 | Boron, max |
| N | 0.015 | Nitrogen, max |
EN10025-6 S960QL High Strength Structural Steel Coil Thermal and Electrical Physical Properties
Physical properties are typical for quenched and tempered low-alloy steel and serve as design reference. Values may vary slightly with actual chemical composition and heat treatment condition. Measurements at room temperature unless specified otherwise.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | 20 °C |
| Elastic modulus (E) | 210 | GPa | 20 °C, static |
| Shear modulus (G) | 81 | GPa | 20 °C, typical |
| Poisson ratio (ν) | 0.3 | — | 20 °C, elastic range |
| Thermal expansion coefficient (α) | 11.1 × 10⁻⁶ | K⁻¹ | 20 - 100 °C |
| Thermal expansion coefficient (α) | 12.1 × 10⁻⁶ | K⁻¹ | 20 - 200 °C |
| Thermal expansion coefficient (α) | 12.9 × 10⁻⁶ | K⁻¹ | 20 - 300 °C |
| Thermal conductivity (λ) | 42 | W/(m·K) | 20 °C |
| Thermal conductivity (λ) | 41 | W/(m·K) | 100 °C |
| Specific heat capacity | 460 | J/(kg·K) | 20 - 100 °C |
| Electrical resistivity (ρe) | 0.25 | µΩ·m | 20 °C, typical |
EN10025-6 S960QL High Strength Structural Steel Coil Mechanical Properties
Minimum required values according to EN 10025-6:2019 for quenched and tempered condition. Properties vary with product thickness. Impact energy is tested on longitudinal Charpy-V specimens at -40°C. Bending test is performed at ambient temperature with specified mandrel diameters.
| Property | Required Value | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield strength (ReH) | 960 | MPa | t ≤ 50 mm, longitudinal |
| Yield strength (ReH) | 900 | MPa | 50 < t ≤ 100 mm, longitudinal |
| Yield strength (ReH) | 850 | MPa | 100 < t ≤ 150 mm, longitudinal |
| Tensile strength (Rm) | 980 - 1150 | MPa | t ≤ 50 mm, longitudinal |
| Tensile strength (Rm) | 950 - 1130 | MPa | 50 < t ≤ 100 mm, longitudinal |
| Tensile strength (Rm) | 900 - 1100 | MPa | 100 < t ≤ 150 mm, longitudinal |
| Elongation (A) | 10 | % | t ≤ 50 mm, longitudinal, L0=5.65√S0 |
| Elongation (A) | 9 | % | 50 < t ≤ 100 mm, longitudinal |
| Elongation (A) | 8 | % | 100 < t ≤ 150 mm, longitudinal |
| Charpy impact energy (KV) | 27 | J | -40 °C, longitudinal, t ≤ 100 mm |
| Charpy impact energy (KV) | 27 | J | -40 °C, longitudinal, 100 < t ≤ 150 mm |
| Bend test (180°) | 3t | — | t ≤ 30 mm, transverse (mandrel diameter = 3×thickness) |
| Bend test (180°) | 4t | — | 30 < t ≤ 50 mm, transverse (mandrel diameter = 4×thickness) |
EN10025-6 S960QL High Strength Structural Steel Coil Fully Equivalent Standards and Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 4950-3:1995 | E960QL | Quenched and tempered high yield strength flat products; identical chemical and mechanical requirements, -40°C impact test |
| European Union | EN 10025-6:2004 | S960QL | Previous edition of the same European standard, fully equivalent |
| European Union | EN 10025-6:2019 | S960QL | Most recent European standard, identical designation |
EN10025-6 S960QL High Strength Structural Steel Coil Application Introduction
S960QL is a premium steel for welded structures where ultra-high strength and weight savings are paramount. Its low-temperature toughness makes it suitable for arctic and offshore conditions. Due to the high strength level, strict welding procedures (including preheating, low-hydrogen electrodes, and post-weld heat treatment) are essential. Typical industries and applications include:
Product Applications: Telescopic crane booms and lattice boom sections, Heavy-duty truck chassis frames and subframes, Offshore platform leg and deck structures, High-load bridge beams and girders, Mining dumper bodies and excavator buckets, High-pressure cylinders and gas storage tanks
Processed into products: Welded main beams, outriggers, and swing arms for cranes, Load-bearing arms and pivoting joints for heavy machinery, Reinforced splice plates and connection brackets, Longitudinal chassis rails and cross-members, Crane hook holders and lifting eyes, Cutting edges and wear-resistant panels in earthmoving equipment
Application industries: Mobile crane and lifting equipment manufacturing, Heavy transport and truck/trailer engineering, Offshore and marine structural engineering, Bridge and infrastructure construction, Mining and earthmoving machinery, Pressure vessel and industrial equipment fabrication
EN10025-6 S960QL High Strength Structural Steel Coil Similar and Alternative Steel Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-6 | S960Q | Same quenched and tempered condition but Charpy test at 0°C instead of -40°C; equivalent strength but lower toughness guarantee |
| European Union | EN 10025-6 | S1100QL | Next strength level (1100 MPa yield) with -40°C toughness; higher strength but reduced ductility and weldability compatibility |
| China | GB/T 16270-2009 | Q960E | Quenched and tempered high strength structural steel with 960 MPa yield and -40°C Charpy test; chemical ranges partly different, performance similar |
| European Union | EN 10149-2 | S960MC | Thermomechanically rolled cold-forming steel (not quenched and tempered); same minimum yield strength but different fabrication route, generally thinner gauge and limited processing |
Notes:
Designation decoding: S = structural steel; 960 = minimum yield strength in MPa; Q = quenched and tempered; L = low temperature Charpy impact test at -40°C.
Material is typically delivered with inspection certificate 3.1 according to EN 10204.
For welding, low heat input and interpass temperature control are crucial to maintain mechanical properties in the heat-affected zone.
Not intended for hot forming unless followed by re-quenching and tempering.
For further processing by the customer, strict adherence to the manufacturer's recommendations regarding forming radii and edge preparation is mandatory.
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