1. What does "1.0565" mean?
The number 1.0565 is a material designation from the European standard EN 10216-1, which covers seamless steel tubes for pressure purposes.
1. indicates it is a steel.
0565 is the unique material number.
This steel is chemically and mechanically equivalent to the well-known AISI/SAE 1020 or DIN 1.0402 carbon steel.
2. Material Summary
1.0565 is a non-alloy quality carbon steel with good mechanical properties, excellent weldability, and good machinability. It is one of the most common and versatile grades for general engineering and pressure applications.
Common Name: P235TR1 / P235TR2 (according to EN 10216-1)
Similar Grades:
USA: AISI/SAE 1020, ASTM A53 Grade B, ASTM A106 Grade B (similar, but not identical)
Germany: DIN 1.0402, St 35.8 (DIN 17175)
3. Chemical Composition (Typical from EN 10216-1)
The composition is balanced for strength and formability.
| Element | Content (%, max, for P235TR1/TR2) |
|---|---|
| Carbon (C) | 0.16 - 0.20 |
| Manganese (Mn) | 0.70 - 1.20 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.020 |
| Silicon (Si) | ≤ 0.35 |
Note: The exact ranges can vary slightly between the TR1 and TR2 delivery conditions.
4. Mechanical Properties (from EN 10216-1)
The properties depend on the heat treatment condition (delivered as TR1 or TR2).
| Property | P235TR1 (As Rolled) | P235TR2 (Normalized) |
|---|---|---|
| Yield Strength (ReH), min | 235 MPa | 235 MPa |
| Tensile Strength (Rm) | 360 - 510 MPa | 360 - 480 MPa |
| Elongation (A), min | 25% | 25% |
5. Key Characteristics & Advantages
Good Strength & Toughness: Offers a excellent balance for many structural and pressure applications.
Excellent Weldability: Due to its low carbon content, it can be easily welded using all standard methods without pre-heating or post-weld heat treatment (in most cases).
Good Machinability: Easier to machine than higher carbon or alloy steels.
Good Formability: Can be cold bent and flanged without significant issues.
Cost-Effective: As a non-alloy steel, it is more affordable than alloy or stainless steels.
Seamless Construction: No weld seam, making it stronger, more uniform, and safer for high-pressure applications. It is also less prone to corrosion starting at a weld line.
6. Common Applications
1.0565 seamless pipes are used in a wide range of industries due to their versatility:
Pressure Vessels and Boilers: For steam, water, and air systems.
Power Generation: In low to medium temperature and pressure service.
Oil & Gas: For gathering lines, process piping, and non-critical structural applications.
Chemical and Petrochemical Industry: For transporting various process media.
Mechanical and Structural Engineering: For hydraulic cylinders, bearing sleeves, and general machinery parts.
Construction: As structural components and for utility lines.
7. Available Sizes and Dimensions
Seamless pipes conforming to EN 10216-1 are available in a wide range of sizes:
Outside Diameter (OD): Typically from around 10 mm up to 711 mm or more.
Wall Thickness: Available in various schedules (e.g., SCH 40, SCH 80, SCH 160) or specific thicknesses, typically defined by the standard's series (e.g., Series 1, Series 2).
Summary
The 1.0565 Seamless Steel Pipe is a high-quality, versatile, and reliable non-alloy carbon steel tube. Its excellent combination of strength, weldability, and formability, coupled with the inherent advantages of a seamless manufacturing process, makes it a go-to choice for countless pressure and mechanical applications across the engineering world.
When sourcing, always ensure the pipe is supplied with the relevant mill certificates (e.g., EN 10204 3.1/3.2) to guarantee it meets the required EN 10216-1 standard.
