EN10025-6 S960QL High Strength Structural Steel for SSAW Pipe
S960QL SSAW Pipe: EN 10025-6 High Strength Quenched & Tempered Steel Grade Data
Explore S960QL SSAW pipe material properties per EN 10025-6, with chemical composition, mechanical & physical data, equivalents, and guideline for offshore and structural applications.
SAW welding (spiral), hot rolling, quenching and tempering, cold forming, machining
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EN10025-6 S960QL High Strength Structural Steel for SSAW Pipe Introduction
S960QL is a high-strength quenched and tempered structural steel grade under EN 10025-6, featuring a minimum yield strength of 960 MPa and excellent low-temperature toughness. When produced as an SSAW (spiral submerged arc welded) pipe, it uses hot-rolled plate or strip that is subsequently formed and welded, delivering high load-bearing capacity and good weldability.
- Key attributes: high strength-to-weight ratio, good ductility, and reliable impact toughness at -40°C.
- Typical delivery condition: quenched and tempered (Q+T).
- Widely applied in heavy-duty structures, offshore engineering, and fluid transportation pipelines.
EN10025-6 S960QL High Strength Structural Steel for SSAW Pipe Chemical Composition
Chemical composition (ladle analysis) in accordance with EN 10025-6:2019, applicable for product thickness ≤50 mm. All values given as mass percent unless indicated otherwise.
| Element | Value (max %) | Notes |
|---|---|---|
| C | 0.20 | max |
| Si | 0.80 | max |
| Mn | 1.70 | max |
| P | 0.020 | max |
| S | 0.010 | max |
| N | 0.015 | max |
| Cr | 1.50 | max |
| Mo | 0.70 | max |
| Ni | 2.0 | max |
| Cu | 0.50 | max |
| V | 0.12 | max |
| Ti | 0.05 | max |
| Nb | 0.06 | max |
| B | 0.005 | max |
| Al total | ≥0.015 | min |
EN10025-6 S960QL High Strength Structural Steel for SSAW Pipe Thermal and Electrical Physical Properties
Typical physical properties for quenched and tempered S960QL plate. These values are for reference at room temperature unless otherwise noted, and may vary slightly depending on heat treatment and thickness.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | at 20°C |
| Young's modulus (E) | 210 | GPa | at 20°C |
| Shear modulus (G) | 80 | GPa | calculated, 20°C |
| Poisson's ratio (ν) | 0.3 | - | at 20°C |
| Thermal expansion coefficient (α) | 11.5 | 10⁻⁶/K | 20-100°C |
| Thermal expansion coefficient (α) | 12.0 | 10⁻⁶/K | 20-200°C |
| Thermal expansion coefficient (α) | 12.5 | 10⁻⁶/K | 20-300°C |
| Thermal conductivity (λ) | 45 | W/(m·K) | at 20°C |
| Thermal conductivity (λ) | 42 | W/(m·K) | at 100°C |
| Thermal conductivity (λ) | 38 | W/(m·K) | at 200°C |
| Specific heat capacity (c) | 460 | J/(kg·K) | at 20°C |
| Electrical resistivity (ρe) | 0.25 | μΩ·m | at 20°C |
EN10025-6 S960QL High Strength Structural Steel for SSAW Pipe Mechanical Properties
Mechanical properties as per EN 10025-6:2019, based on tensile testing at room temperature and Charpy V-notch impact testing. Unless specified, properties are for longitudinal direction. Bend test mandrel diameters apply to transverse test pieces.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | ≥960 | MPa | t ≤50 mm, longitudinal |
| Yield strength (ReH) | ≥910 | MPa | 50 mm < t ≤100 mm, longitudinal |
| Tensile strength (Rm) | 980 - 1150 | MPa | t ≤100 mm, longitudinal |
| Elongation (A) after fracture | ≥7 | % | L0=5.65√S0, longitudinal, t ≤100 mm |
| Charpy impact energy (KV2) | ≥27 | J | at -40°C, longitudinal |
| Charpy impact energy (KV2) | ≥20 | J | at -40°C, transverse |
| Bend test (mandrel diameter) | 2t | t ≤5 mm, 180° | |
| Bend test (mandrel diameter) | 3t | 5 < t ≤10 mm, 180° | |
| Bend test (mandrel diameter) | 4t | 10 < t ≤20 mm, 180° | |
| Bend test (mandrel diameter) | 5t | 20 < t ≤40 mm, 180° | |
| Bend test (mandrel diameter) | 6t | 40 < t ≤63 mm, 180° | |
| Bend test (mandrel diameter) | 7t | 63 < t ≤80 mm, 180° | |
| Bend test (mandrel diameter) | 8t | 80 < t ≤100 mm, 180° |
EN10025-6 S960QL High Strength Structural Steel for SSAW Pipe Completely Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-6 | S960QL | Identical |
| International | ISO 4951-2 | S960QL | Identical |
| Germany | DIN EN 10025-6 | S960QL | Adopts EN standard |
| United Kingdom | BS EN 10025-6 | S960QL | Adopts EN standard |
| France | NF EN 10025-6 | S960QL | Adopts EN standard |
| Italy | UNI EN 10025-6 | S960QL | Adopts EN standard |
EN10025-6 S960QL High Strength Structural Steel for SSAW Pipe Application Introduction
S960QL SSAW pipe is utilized where high strength, low weight, and excellent toughness are required. It is suitable for pressure-containing pipelines and structural tubular applications in harsh environments, including low temperature and offshore conditions.
Product Applications: SSAW longitudinal welded pipes, Spiral pipe for transportation of crude oil, natural gas, and slurry, Structural tubular columns and piles, Pressure vessel shells and piping systems, Offshore platform legs and jackets
Processed into products: Pipe segments and bends, Welded fittings (tees, elbows, reducers), Flanges and coupling joints, Pile connectors and drive shoes, Crane booms and heavy-duty chassis
Application industries: Oil and Gas Pipeline Transportation, Offshore and Marine Engineering, Heavy Construction and Piling, Mining and Mobile Crane Equipment, Wind Energy Towers and Foundations
EN10025-6 S960QL High Strength Structural Steel for SSAW Pipe Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| EU / International | EN 10025-6 | S960Q | Similar strength, impact test at -20°C |
| EU / International | EN 10025-6 | S960QL1 | Similar strength, impact test at -60°C |
| EU / International | EN 10025-6 | S890QL | Lower yield strength (890 MPa), similar toughness |
| China | GB/T 16270 | Q960E | Yield ≥960 MPa, -40°C impact, different alloy system |
| USA | ASTM A514/A514M | Grade Q | Yield 690 MPa, lower strength, quenched & tempered |
Notes:
Manufacturing of SSAW pipe from S960QL requires strict control of welding procedures, including preheating and interpass temperature, to avoid hydrogen-induced cold cracking. Post-weld inspection such as ultrasonic testing (UT) and radiographic testing (RT) is recommended. Quenched and tempered condition must be verified by mechanical testing per EN 10025-6 requirements.
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