Q355B LSAW Steel Pipe DN450

1. Material characteristics: What are the advantages of Q355B material?

Q355B is a low-alloy high-strength carbon steel with a yield strength of ≥355MPa and a tensile strength of 470-630MPa, which is more than 40% higher than that of ordinary Q235, and can withstand pressures within 10MPa. Its low-temperature toughness is excellent, the impact energy at -20℃ is more than or equal to 34 j, it is suitable for working conditions in cold regions, and it is corrosion-resistant, easy to weld, and can meet most middle-end transportation needs without complicated processes, and its cost performance is far higher than that of high-alloy pipes.

2. Specification process: How to ensure structural stability?

DN450 specification is suitable for middle-end flow transportation, which improves the transportation efficiency by 50% compared with DN300 specification, and avoids the construction and cost pressure of large-diameter pipes. Using LSAW longitudinal submerged arc welding process and UOE forming technology, the weld strength is equal to that of the base metal, the stress distribution is uniform, and there is no stress concentration problem of spiral welded pipe. After forming, the residual stress is eliminated by expanding and tempering, and the tolerance of outer diameter is controlled within 0.5%, which ensures the structural stability of buried and open-air laying.

3. Core application: which scenarios are adapted to?

Mainly engaged in municipal water supply and drainage, urban central heating branch lines, medium transportation in small and medium-sized chemical parks and oil field gathering and transportation branch lines. In the municipal scene, it can be used as the main pipe of water supply and drainage and heating pipe network, which is suitable for underground laying; Industrial scene is used for conveying cooling water and low-corrosive raw materials; The energy field is suitable for small and medium-sized gas field gathering and transportation, and it can meet the long-term service demand with simple anti-corrosion coating.

4. Competitive advantage: Why do you become a mid-range choice?

Compared with Q235 LSAW steel pipe, it has higher strength and wider application scope. Compared with seamless steel pipe, the cost is reduced by more than 30%, and the mass production efficiency is higher. Compared with high-alloy pipes, it does not need to bear additional material premium, and can adapt to most scenes through simple anti-corrosion treatment, thus achieving the balanced advantages of "strength reaching the standard, controllable cost and wide adaptability" in the middle-end transportation field.