Q355B LSAW Steel Pipe DN650

Material adaptation: Can Q355B bear DN650 working condition?

Q355B low-alloy high-strength carbon steel can stably bear the working condition of DN650, and its yield strength is ≥355MPa, and its tensile strength is 470-630MPa, which is more than 40% higher than that of Q235. It can withstand the pressure of 13-15MPa and calmly cope with the internal pressure and external load of large-diameter transportation. The impact energy of this material at -20℃ is ≥34J, and its low temperature toughness is excellent. It is suitable for underground laying in cold areas, and it is easy to weld and resist corrosion. It can accurately match the LSAW process, control the cost while ensuring the strength, and its cost performance ratio far exceeds that of high-alloy large-diameter pipes.

Specification process: How to balance large flow and structural stability?

Compared with DN600, DN650 improves the transportation efficiency by more than 12%, which can meet the needs of energy supply in super-large areas and industrial large-scale media transportation, and adapt to centralized transportation scenarios. Using LSAW longitudinal submerged arc welding +UOE precision forming process, the weld strength is equal to that of the base metal, the stress distribution is uniform, and there is no hidden danger of stress concentration in 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.

Core application: What large-scale engineering scenarios are covered?

It is widely used in central heating main pipes in megacities, large municipal water supply and drainage main networks, medium-sized oil and gas gathering and transportation trunk lines and main circulating water pipes in chemical parks. In the municipal scene, it can cover a wide range of energy and water supply in the whole city, greatly reducing the number of pipe network laying; In industrial and energy scenes, long-term stable service can be realized by adapting to low corrosive medium, medium and high pressure working conditions and FBE anticorrosive coating, and adapting to complex laying environment and climate conditions.

Competitive advantage: Why is it suitable for large-scale transportation scenarios?

Compared with Q235 pipe with the same specification, it has higher strength and wider application conditions. Compared with seamless steel pipe, the cost is reduced by more than 30%, and the mass production efficiency is better. Compared with DN700 pipe, the construction difficulty is lower, the cost is more controllable, and the flow meets the needs of large-scale projects. In the field of medium and large-scale transportation, the precise balance of "flow, strength and cost" is realized, and the application cost performance is outstanding.