1. The Meaning of "1.0566"
The number 1.0566 is a material number from the European standard EN 10027-2.
1.xxxx: Indicates it's a steel.
0566: The specific sequential number assigned to this steel's chemical composition.
This material number corresponds to the steel grade P295GH in the EN 10216 standard for seamless steel tubes for pressure purposes.
So, 1.0566 = P295GH.
2. Breakdown of "P295GH"
The grade name itself tells you a lot about the steel's properties:
P: Stands for "Pressure" purpose. This confirms it is intended for building pressure vessels, boilers, and other high-pressure equipment.
295: Indicates the minimum specified yield strength (ReH) at room temperature is 295 MPa (Megapascals). This is a measure of the stress at which the material begins to deform plastically.
G: Stands for "Grain" refined. This means the steel has undergone a specific heat treatment (normalizing) to refine its grain structure, which improves its toughness and mechanical properties.
H: Indicates it is suitable for High temperatures. This steel is designed to retain its strength and resist creep (slow deformation under constant stress) at elevated temperatures, which is crucial for boiler applications.
3. Chemical Composition
The chemical composition (by weight, %) for P295GH/1.0566 is typically as follows (values are maximums unless a range is given):
| Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Chromium (Cr) | Molybdenum (Mo) |
|---|---|---|---|---|---|---|---|
| Content | 0.10 - 0.20 | 0.10 - 0.35 | 0.80 - 1.20 | ≤ 0.025 | ≤ 0.015 | ≤ 0.30 | ≤ 0.08 |
Key Points on Chemistry:
Low Carbon: Keeps the steel weldable and prevents the formation of brittle microstructures.
Low Sulfur & Phosphorus: These are impurities that can reduce toughness and weldability. Keeping them very low is critical for pressure applications.
Manganese: Increases strength and toughness.
4. Key Mechanical Properties
The key mechanical properties for P295GH/1.0566 pipes at room temperature are:
Yield Strength (ReH): ≥ 295 MPa
Tensile Strength (Rm): 470 - 630 MPa
Elongation (A): ≥ 24% (This is a measure of ductility-how much it can stretch before breaking.)
5. Common International Equivalents
It's very useful to know the equivalent grades in other major standards:
| Standard | Equivalent Grade | Note |
|---|---|---|
| EN (Europe) | 1.0566 / P295GH | The original designation. |
| DIN (Germany) | HII | An older German designation, still commonly used. |
| ASTM/ASME (USA) | SA-192 / SA-210 Grade A1 | The closest and most direct equivalents for boiler tubes. |
| ISO | P295GH | Same as the EN designation. |
| JIS (Japan) | STPT370 / STB340 | Similar grades for pressure and boiler tubes. |
Note: While these are equivalents, there can be slight variations in chemical composition or mechanical properties. For critical applications, the exact specification must be consulted.
6. Main Applications
As the name "Boiler Steel Pipe" implies, its primary use is in systems involving high temperature and pressure:
Boiler Tubes: Both in fire-tube and water-tube boilers for power generation and industrial heating.
Superheaters and Reheaters: Sections of a boiler that heat steam to very high temperatures.
Pressure Vessels: Containers designed to hold gases or liquids at a pressure substantially different from ambient pressure.
Heat Exchangers: Where hot fluids transfer heat to cooler fluids.
High-Temperature Piping Systems: In power plants and process industries.
Summary
In short, 1.0566 Carbon Steel Boiler Steel Pipe is a high-quality, heat-resistant, pressure-rated carbon steel specifically designed for safe and reliable operation in high-temperature and high-pressure environments like boilers and pressure vessels. Its key characteristics are defined by its EN grade P295GH, signifying a minimum yield strength of 295 MPa, a grain-refined structure, and suitability for high-temperature service.
