EN10219 S355 HFW Steel Pipe DN400 For Heavy Structural Engineering Projects

S355 structural steel under EN 10219 is widely used for heavy engineering due to its excellent mechanical properties. The material provides a minimum yield strength of approximately 355 MPa and tensile strength typically ranging from 470 to 630 MPa, ensuring strong load-bearing capacity under high stress conditions. The chemical composition is carefully controlled, generally limiting carbon to around 0.20 percent while maintaining manganese levels near 1.50 percent to improve toughness and weldability. For S355J2H, additional impact testing at lower temperatures ensures better resistance to dynamic loads and harsh environmental conditions.

Huayang Steel Pipe manufactures DN400 HFW pipes using advanced high-frequency welding technology, producing a uniform and continuous longitudinal weld seam with stable metallurgical properties. Precision forming and sizing processes ensure accurate outer diameter and consistent wall thickness along the pipe body. Each pipe undergoes weld seam ultrasonic inspection, dimensional verification, and mechanical property testing. For heavy structural engineering projects, additional surface treatments such as galvanizing or anti-corrosion coatings are applied to enhance durability and ensure long-term structural reliability.