S355 pipe is a high-strength low-alloy structural steel pipe that offers excellent mechanical properties and good weldability. It is widely used in construction, engineering, and industrial applications where high strength and toughness are required. It derives its name from its minimum yield strength of 355 MPa (megapascals). This article will explore the key characteristics, grades, and applications of the product to help you understand this versatile steel product.
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Grades:S355JRH/J0H/J2H
S355 pipe is available in several grades that offer different levels of impact toughness and suitability for various operating temperatures. The most common grades are S355JRH, S355J0H, and S355J2H. The letters after "S355" indicate the grade's impact test requirements:
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S355JRH: This grade is tested for impact strength at room temperature (20°C). It is designed for applications where the lowest operating temperature does not fall below 0°C. The S355JRH offers adequate performance in standard conditions but may not be suitable for more extreme cold environments. Its impact resistance at 20°C makes it suitable for general structural uses where temperature variations are minimal.
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S355J0H: In contrast, the S355J0H grade is tested for impact strength at 0°C, which provides a significant improvement in low-temperature toughness compared to the S355JRH grade. This enhancement allows the S355J0H to be used in environments where temperatures can drop to near-freezing conditions. Its ability to maintain performance at 0°C makes it a better choice for applications subjected to moderately cold climates or environments with occasional low temperatures.
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S355J2H: This grade represents the highest standard for low-temperature toughness among the three. It undergoes impact testing at -20°C, ensuring the best performance in cold conditions. S355J2H is ideal for use in very cold climates or applications where exposure to sub-zero temperatures is expected. Its superior impact resistance at -20°C makes it the most suitable choice for environments with extreme cold or where operational temperatures are significantly below freezing.
The "H" at the end of each grade designation stands for "Hollow," indicating that these are hollow section products like pipes and tubes. The choice between these grades depends on the specific requirements of your project, including operating temperatures and required toughness levels.
Non-Alloy Structural Steel
S355 pipe is classified as a non-alloy structural steel, meaning it achieves its properties primarily through careful control of its carbon content and heat treatment, rather than through the addition of significant amounts of alloying elements. The key features that make the S355 pipe stand out are its high yield strength and excellent impact toughness.
The minimum yield strength of 355 MPa is a crucial property that defines S355 steel. Yield strength represents the stress at which a material begins to deform plastically. The high yield strength of it allows it to withstand substantial loads without permanent deformation, making it ideal for structural applications in construction and heavy engineering.
In addition to its high strength, these pipes also offer good impact toughness. Impact toughness is a measure of a material's ability to absorb energy during sudden impact without fracturing. This property is particularly important in applications where the material may be subjected to dynamic loads or in environments where brittle fracture must be avoided. The good impact toughness of S355 pipe, especially in the J0H and J2H grades, ensures that it can maintain its structural integrity even under challenging conditions.
The combination of high strength and good toughness makes it an excellent choice for a wide range of applications, including: - Structural supports in buildings and bridges - Offshore platforms and marine structures - Heavy machinery components - Pressure vessels and pipelines - Wind turbine towers - Crane booms and chassis
Yield Strength Of S355J2 Varies With The Thickness Of The Steel
An important characteristic of S355 steel, including S355J2 pipe, is that its yield strength varies depending on the thickness of the material. This variation is a result of the manufacturing process and the cooling rates experienced by different thicknesses of steel during production.
For S355J2 pipe, the minimum yield strength is specified as follows: - For thicknesses ≤ 16 mm: 355 MPa - For thicknesses > 16 mm to ≤ 40 mm: 345 MPa - For thicknesses > 40 mm to ≤ 63 mm: 335 MPa - For thicknesses > 63 mm to ≤ 80 mm: 325 MPa - For thicknesses > 80 mm to ≤ 100 mm: 315 MPa
This variation in yield strength is crucial for engineers and designers to consider when specifying S355J2 pipe for their projects. It ensures that the material properties are accurately represented across different thicknesses, allowing for more precise and safe designs.
Despite the decrease in yield strength for thicker sections, S355J2 pipe still maintains excellent strength-to-weight ratios across all thickness ranges. This characteristic allows for the design of lighter structures without compromising on strength, leading to cost savings in material and easier handling during construction.
S355 Pipe For Sale
These pipe is widely available from steel manufacturers and distributors worldwide. When looking to purchase S355 pipe, it's important to consider several factors to ensure you're getting the right product for your needs:
- Grade selection: Choose between S355JRH, S355J0H, and S355J2H based on your project's temperature requirements and needed impact toughness.
- Dimensions: It is available in various diameters and wall thicknesses. Ensure the dimensions meet your project specifications.
- Length: Pipes are typically available in standard lengths, but custom lengths may be ordered for specific project needs.
- Surface finish: Consider whether you need hot-finished, cold-formed, or seamless pipes, depending on your application.
- Certifications: Ensure the supplier provides the necessary material certificates and test reports to verify the pipe's properties.
- Price and availability: Compare quotes from different suppliers, considering factors like lead times and minimum order quantities.
When sourcing S355 pipe, it's crucial to work with reputable suppliers who can provide high-quality products that meet international standards. One such supplier is LONGMA GROUP, which offers a comprehensive range of S355 pipe products.LONGMA GROUP's S355 pipe covers Grades:S355JRH/J0H/J2H. If you are choosing your S355 pipe manufacturers, welcome to contact us at info@longma-group.com.
