EN10025-6 S890QL1 High Yield Steel for SSAW Pipes
EN10025-6 S890QL1 SSAW Pipe: High-Strength Quenched & Tempered Steel for Heavy-Duty Applications
Explore EN10025-6 S890QL1 SSAW pipe: a high-strength quenched and tempered fine-grain structural steel offering yield strength ≥890 MPa and excellent toughness at -40°C. Ideal for heavy machinery, offshore structures, and piling.
Quenching and tempering (Q+T); suitable for welding (SMAW, SAW, GMAW), cold forming (limited), and machining
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EN10025-6 S890QL1 High Yield Steel for SSAW Pipes Introduction
S890QL1 is a high-strength structural steel grade defined in EN 10025-6, supplied in the quenched and tempered condition. This fine-grain steel offers a minimum yield strength of 890 MPa and excellent low-temperature toughness, with a Charpy impact guarantee at -40°C (QL1 designation). SSAW (Spiral Submerged Arc Welded) pipes fabricated from S890QL1 combine superior mechanical properties with cost-effective large-diameter production. The material is characterized by:
- High strength-to-weight ratio for weight-optimized designs
- Good weldability with suitable consumables
- Reliable toughness in sub-zero environments
- Uniform through-thickness properties in moderate thicknesses
Typical applications include crane booms, offshore structures, pressure vessels, and driven piles.
EN10025-6 S890QL1 High Yield Steel for SSAW Pipes Chemical Composition
The chemical composition of S890QL1 is carefully balanced to achieve high strength and low-temperature toughness after quenching and tempering. Grain-refining elements such as Al, Nb, V, and Ti are added, and the carbon equivalent is controlled to ensure good weldability. All values are maximum unless a range is indicated.
| Element | Standard Value (max. wt%) | Remarks |
|---|---|---|
| Carbon (C) | 0.20 | Max. |
| Silicon (Si) | 0.80 | Max. |
| Manganese (Mn) | 1.70 | Max. |
| Phosphorus (P) | 0.020 | Max. |
| Sulfur (S) | 0.010 | Max. |
| Aluminium (Al) | ≥ 0.015 | Minimum for fine grain practice; total aluminium |
| Chromium (Cr) | 1.50 | Max. |
| Nickel (Ni) | 2.0 | Max. |
| Molybdenum (Mo) | 0.70 | Max. |
| Copper (Cu) | 0.50 | Max. |
| Niobium (Nb) | 0.06 | Max. |
| Vanadium (V) | 0.12 | Max. |
| Titanium (Ti) | 0.05 | Max. |
| Nitrogen (N) | 0.015 | Max. |
| Boron (B) | 0.005 | Max. |
| Zirconium (Zr) | 0.15 | Max. |
EN10025-6 S890QL1 High Yield Steel for SSAW Pipes Thermal and Electrical Physical Properties
Typical physical properties for S890QL1 steel at room temperature and as a function of temperature. These values are indicative for design calculations and may vary slightly with actual heat analysis and heat treatment condition. Data are representative of low-alloy quenched and tempered steels.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | At 20°C |
| Modulus of Elasticity (E) | 210 | GPa | At 20°C |
| Shear Modulus (G) | ~81 | GPa | At 20°C |
| Poisson's Ratio (ν) | 0.3 | — | At 20°C |
| Thermal Expansion (α) | 11.1 | 10⁻⁶/K | 20 - 100°C |
| Thermal Expansion (α) | 12.5 | 10⁻⁶/K | 20 - 200°C |
| Thermal Expansion (α) | 13.5 | 10⁻⁶/K | 20 - 400°C |
| Thermal Conductivity (λ) | 42 | W/(m·K) | At 20°C |
| Thermal Conductivity (λ) | 40 | W/(m·K) | At 200°C |
| Thermal Conductivity (λ) | 37 | W/(m·K) | At 400°C |
| Specific Heat Capacity (c) | ~460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρₑ) | ~0.23 | 10⁻⁶ Ω·m | At 20°C |
EN10025-6 S890QL1 High Yield Steel for SSAW Pipes Mechanical Properties
Mechanical properties for S890QL1 are tested on quenched and tempered test specimens taken from the base material. Values apply to transverse specimens (tensile) and longitudinal specimens (impact) as per EN 10025-6. Guaranteed values for thickness ≤ 50 mm. For greater thicknesses, slight reductions in strength may apply; refer to the standard.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | 890 (min.) | MPa | Ambient; thickness ≤ 50 mm |
| Tensile Strength (Rm) | 940 - 1100 | MPa | Ambient; thickness ≤ 50 mm |
| Elongation (A) | 11 (min.) (long.), 9 (min.) (trans.) | % | Gauge length L₀ = 5.65√S₀ |
| Charpy Impact Energy (KV₂) | 30 (min.) at -40°C | J | Longitudinal; V-notch; QL1 requirement |
| Bend Test | Mandrel diameter 4t for t ≤ 50 mm; 180° bend | — | Tensile side free from cracks |
EN10025-6 S890QL1 High Yield Steel for SSAW Pipes Fully Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-6 | S890QL1 | Identical; quenched and tempered |
| Germany | DIN EN 10025-6 | S890QL1 | Same as European standard |
| International | ISO 4951-2 | S890QL1 | Derived from EN; comparable |
| UK | BS EN 10025-6 | S890QL1 | Adopted European standard |
EN10025-6 S890QL1 High Yield Steel for SSAW Pipes Application Introduction
S890QL1 SSAW pipe combines the high strength of quenched and tempered steel with the spiral welding process, enabling large-diameter pipes with reduced wall thickness. Key advantages: weight savings, excellent low-temperature toughness, and good weldability.
- Industries: Offshore and marine, heavy lifting and transportation, mining, construction of bridges, piling, pressure vessels.
- Products: Spiral welded pipes, tubular piles, crane lattice booms, offshore jacket legs, wind turbine monopiles.
- Processing: welding with matching strength filler metals, limited cold bending (radii per code), abrasive cutting, and machining.
Product Applications: SSAW large-diameter pipes for piles and conductors, Box beams and hollow sections, Crane booms and lattice structures, Pressure vessels and storage tanks, Excavator arms and booms, Offshore platform legs and bracings
Processed into products: Spiral welded pipe segments for driven piles, Welded tubular joints in offshore jackets, Telescopic crane boom sections, Structural nodes in heavy-load frameworks, Pressure vessel shells with reduced wall thickness, Transition pieces and connectors in high-stress zones
Application industries: Offshore oil and gas, Heavy lifting and cranes, Mining machinery, Structural engineering (bridges, stadiums), Piling and foundation engineering, Wind energy (monopile foundations)
EN10025-6 S890QL1 High Yield Steel for SSAW Pipes Similar or Substitute Materials for S890QL1
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-6 | S890Q | No guaranteed impact at low temp (delivered at ambient toughness) |
| Europe | EN 10025-6 | S890QL | Guaranteed -20°C impact (instead of -40°C) |
| Europe | EN 10025-6 | S890QL2 | Guaranteed -60°C impact, more stringent toughness |
| USA | ASTM A514/A514M | Grade S | Quenched and tempered alloy steel plate; min yield 690 MPa, similar tensile but different tough. |
| Japan | JIS G 3128 | SHY685 | High yield quenched and tempered plate; yield ~685 MPa, lower strength |
Notes:
Welding: Preheating usually not required for small thicknesses; strictly follow consumable manufacturer instructions. Post-weld heat treatment may affect strength. NDT: Ultrasonic inspection per EN 10160 or equivalent. Corrosion protection: Typically applied via painting or coating for offshore environments. SSAW pipes from S890QL1 are supplied with test certificates according to EN 10204 Type 3.1 (or 3.2).
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