Spiral Welded Carbon Steel Pipes For Underground Natural Gas Pipelines – EN10219
One of the main advantages of spiral welded carbon steel pipe is the ability to produce pipes of different diameters using strips of the same width. This is particularly beneficial for applications that require narrow strips of steel to produce large diameter steel pipes. This innovative manufacturing process ensures that the pipes produced are not only durable and strong, but also of consistent quality.
Spiral welded carbon steel pipes are specially designed for underground natural gas pipeline installation and comply with the strict requirements of EN10219. This standard outlines the technical delivery requirements for cold-formed welded structural hollow sections of non-alloy steels and fine-grained steels. The pipe is therefore ideally suited for use in underground natural gas pipelines where corrosion resistance and structural integrity are critical.
Mechanical Property
| steel grade | minimum yield strength Mpa |
Tensile strength | Minimum elongation % |
Minimum impact energy J |
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| Specified thickness mm |
Specified thickness mm |
Specified thickness mm |
at test temperature of | |||||
| ＜16 | ＞16≤40 | ＜3 | ≥3≤40 | ≤40 | -20℃ | 0℃ | 20℃ | |
| S235JRH | 235 | 225 | 360-510 | 360-510 | 24 | - | - | 27 |
| S275J0H | 275 | 265 | 430-580 | 410-560 | 20 | - | 27 | - |
| S275J2H | 27 | - | - | |||||
| S355J0H | 365 | 345 | 510-680 | 470-630 | 20 | - | 27 | - |
| S355J2H | 27 | - | - | |||||
| S355K2H | 40 | - | - | |||||
Chemical Composition
| Steel grade | Type of de-oxidation a | % by mass, maximum | ||||||
| Steel name | Steel number | C | C | Si | Mn | P | S | Nb |
| S235JRH | 1.0039 | FF | 0,17 | — | 1,40 | 0,040 | 0,040 | 0.009 |
| S275J0H | 1.0149 | FF | 0,20 | — | 1,50 | 0,035 | 0,035 | 0,009 |
| S275J2H | 1.0138 | FF | 0,20 | — | 1,50 | 0,030 | 0,030 | — |
| S355J0H | 1.0547 | FF | 0,22 | 0,55 | 1,60 | 0,035 | 0,035 | 0,009 |
| S355J2H | 1.0576 | FF | 0,22 | 0,55 | 1,60 | 0,030 | 0,030 | — |
| S355K2H | 1.0512 | FF | 0,22 | 0,55 | 1,60 | 0,030 | 0,030 | — |
| a. The deoxidation method is designated as follows:
FF: Fully killed steel containing nitrogen binding elements in amounts sufficient to bind available nitrogen (e.g. min. 0,020 % total Al or 0,015 % soluble Al). b. The maximum value for nitrogen does not apply if the chemical composition shows a minimum total Al content of 0,020 % with a minimum Al/N ratio of 2:1, or if sufficient other N-binding elements are present. The N-binding elements shall be recorded in the Inspection Document. |
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In addition to its versatility in manufacturing large diameter steel pipes, spiral welded carbon steel pipes offer many other advantages. Its spiral welding technology ensures the pipe has a smooth inner surface, reducing pressure drop and improving flow characteristics. This is especially important in natural gas pipeline applications, where efficient and unhindered flow is critical for optimal performance.
Additionally, spiral welded carbon steel pipe is highly resistant to corrosion, making it ideal for underground installations where exposure to moisture and soil elements can compromise the integrity of the pipe. Its sturdy construction and durable materials make it ideal for long-term use in challenging environmental conditions.
The use of high-quality carbon steel ensures the pipes have excellent mechanical properties, including high tensile strength and impact resistance. This makes it a reliable choice for underground natural gas pipe installations, as pipelines may be subject to external loads and potential damage.
In summary, spiral welded carbon steel pipes are the best choice for underground natural gas pipeline applications. Its innovative manufacturing process allows the production of large diameter steel pipes from narrow strips of steel, ensuring consistent quality and durability. The pipe meets the requirements of the EN10219 standard and has excellent corrosion resistance, smooth internal surface and strong mechanical properties, making it ideal for long-term reliable use in underground natural gas pipeline installations.
