Seamless steel pipes occupy an important position in modern industry and are widely used in construction, machinery manufacturing, petrochemical and other fields.  EN 10210 specifically specifies seamless steel pipes for structures, among which BS EN 10210-1 is a specific specification for hot-rolled non-alloy and fine-grained structural steels. Common grades in this standard include S235GRH, S275JOH, S275J2H, S355JOH and S355J2H.

First, S235GRH is a basic grade steel, mainly used for structural parts under low stress and room temperature environment. With a yield strength of 235MPa, it has good weldability and cold formability, and is suitable for general construction and mechanical structures.

Next are S275JOH and S275J2H. S275JOH has good toughness at -20℃ and a yield strength of 275MPa, and is usually used for building structures and bridge projects with medium loads. S275J2H has better impact toughness at -20℃, and is suitable for structural parts that require a higher safety factor.

S355JOH and S355J2H are high-strength steels. S355JOH has excellent toughness at both room temperature and low temperature (-20℃), with a yield strength of 355MPa, and is widely used in high-stress and important structural projects, such as high-rise buildings and large bridges. S355J2H has higher impact toughness at -20℃, and is suitable for extremely cold areas or projects that require additional safety assurance.

The EN 10210 standard not only clearly stipulates the chemical composition and mechanical properties of steel pipes, but also puts forward specific requirements for dimensional tolerances, surface quality, non-destructive testing, etc. This ensures the consistency and reliability of steel pipes during manufacturing and use.

Seamless steel pipes are formed by hot rolling technology, which gives them excellent mechanical properties and good dimensional accuracy. The hot rolling process can eliminate the stress inside the steel pipe, improve the organizational structure of the steel, and enhance its comprehensive performance. Compared with welded steel pipes, seamless steel pipes have higher compressive, bending and torsional strengths, and are suitable for structural support and fluid transportation under various complex working conditions.

In general, seamless steel pipes produced according to EN 10210 standards show excellent performance in the construction and industrial fields. Steel pipes of grades such as S235GRH, S275JOH, S275J2H, S355JOH, and S355J2H have their own characteristics and can meet the needs of different projects. Their wide application not only improves the quality and safety of projects, but also promotes the development and innovation of steel material technology. Choosing seamless steel pipes of appropriate grades and specifications is crucial to ensuring the long-term stability and economic benefits of projects.