EN 10216 Seamless Steel Tubes
EN 10216 Seamless Steel Tubes
EN 10216 seamless steel tubes are manufactured through hot rolling or cold drawing processes without any welded joints, ensuring superior mechanical properties and resistance to internal and external pressures. These tubes are designed for high-pressure applications and conform to rigorous quality standards, making them ideal for boilers, heat exchangers, and pipelines.
Key Features EN 10216 Seamless Steel Tubes
1. High Pressure and Temperature Resistance: The seamless design ensures no weak points, making these tubes ideal for high-pressure and high-temperature applications.
2. Superior Strength and Durability: Manufactured from high-quality steel with controlled chemical composition, ensuring exceptional mechanical properties.
3. Corrosion and Oxidation Resistance: Available in different grades with enhanced corrosion resistance, suitable for harsh industrial environments.
4. Precision Engineering and Dimensional Accuracy: Cold-drawn seamless tubes provide superior dimensional accuracy, making them suitable for critical applications.
5. Long Service Life and Reliability: Designed to last longer than welded tubes, reducing maintenance costs and operational downtime.
EN 10216 Seamless Steel Tube Dimensions
Out Dimensions: 14mm-509mm
Wall Thickness: 2mm-50mm
Length: Fixed(6m,9m,12,24m) or normal length(5-12m)
Ends: Plain End, Beveled End, Treaded
EN 10216 1, 2, 3, 4, 5 Chemical Composition
| Grade | C (Max) | Si | Mn | P (Max) | S (Max) | Cr | Mo | Ni |
| P195GH (EN 10216-2) | 0.13 | 0.35 | 0.7 | 0.025 | 0.02 | – | – | – |
| P235GH (EN 10216-2) | 0.16 | 0.35 | 0.60-1.20 | 0.025 | 0.02 | – | – | – |
| P265GH (EN 10216-2) | 0.2 | 0.4 | 0.80-1.40 | 0.025 | 0.02 | – | – | – |
| 16Mo3 (EN 10216-2) | 0.12-0.20 | 0.35 | 0.40-0.90 | 0.025 | 0.02 | 0.3 | 0.25-0.35 | – |
| 13CrMo4-5 (EN 10216-2) | 0.10-0.18 | 0.35 | 0.40-0.90 | 0.025 | 0.02 | 0.70-1.15 | 0.40-0.60 | – |
EN 10216 1, 2, 3, 4, 5 Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Test (J) |
| P195GH | ≥195 | 320-440 | ≥27 | ≥27 at 20°C |
| P235GH | ≥235 | 360-500 | ≥25 | ≥27 at 20°C |
| P265GH | ≥265 | 410-570 | ≥23 | ≥27 at 20°C |
| 16Mo3 | ≥275 | 450-600 | ≥22 | ≥27 at 20°C |
| 13CrMo4-5 | ≥290 | 440-590 | ≥20 | ≥27 at 20°C |
EN 10216 1, 2, 3, 4, 5 Physical Properties
| Property | Value |
| Density | 7.85 g/cm³ |
| Melting Point | 1420-1460°C |
| Thermal Conductivity (W/m·K) | ~50 at 20°C |
| Electrical Resistivity (Ω·m) | ~0.1 × 10⁻⁶ |
| Modulus of Elasticity (GPa) | ~200 GPa |
Standard and Grades
- EN 10216-1 – Non-alloy steel tubes with specified room temperature properties. Common Grades: P195TR1, P195TR2, P235TR1, P235TR2, P265TR1, P265TR2
- EN 10216-2 – Seamless steel tubes with specified elevated temperature properties for pressure purposes. Common Grades: P235GH, P265GH, 16Mo3, 10CrMo9-10, 13CrMo4-5
- EN 10216-3 – Alloy fine grain steel tubes. Common Grades: P275NL, P355N, P355NH, P460N, P460NH
- EN 10216-4 – Seamless steel tubes for pressure purposes with specified low-temperature properties. Common Grades: P215NL, P255QL, P265NL
- EN 10216-5 – Stainless steel tubes. Common Grades: X2CrNi12, X5CrNi18-10, X6CrNiMoTi17-12-2
Manufacturing Process
1. Selection of Raw Material
- High-quality billets or rounds are selected based on the required chemical composition.
- The raw material is tested for chemical and mechanical properties before processing.
2. Heating & Piercing
- The billets are heated in a rotary furnace to the required forging temperature (around 1200-1300°C).
- The hot billet is then pierced using a rotary piercing mill or cross-roll piercing process to create a hollow shell.
3. Elongation & Sizing
- The pierced shell is elongated using a mandrel mill or plug mill to refine the wall thickness and diameter.
- The tube is then passed through a sizing mill to achieve the desired dimensions.
4. Heat Treatment (If Required)
Depending on the grade, heat treatment processes such as:
- Normalizing (N): Heating above critical temperature and air cooling.
- Quenching & Tempering (QT): Rapid cooling followed by reheating to enhance strength.
- Annealing (A): Slow cooling to improve ductility.
This process refines the microstructure and enhances mechanical properties.
5. Straightening & Cutting
- The tube is straightened using rotary straightening machines.
- It is then cut to the required length using automatic saws.
6. Surface Treatment & Inspection
- Surface finishing processes such as pickling, phosphating, or varnishing are applied.
- Tubes undergo non-destructive testing (NDT) such as ultrasonic, eddy current, or hydrostatic tests.
- Dimensional checks, hardness testing, and mechanical property verification are conducted.
7. Marking & Packing
- Each tube is marked with grade, size, heat number, and standard compliance (e.g., EN 10216-2 P235GH).
- Tubes are packed in wooden boxes, bundles, or wrapped with plastic to prevent corrosion.
Application
- Oil & Gas Industry
- Power Plants & Boilers
- Petrochemical & Chemical Processing
- Mechanical & Structural Engineering
- Aerospace & Automotive
