Q355B LSAW Steel Pipe DN600

1. Material adaptation: Can Q355B support DN600?

Q355B low-alloy high-strength carbon steel can stably support DN600 working condition, 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 12-14MPa and calmly meet the internal pressure demand 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.

2. Specification process: How to balance large flow and stability?

Compared with DN550, the transport efficiency of DN600 is improved by more than 15%, which can meet the needs of energy supply in super-large areas and industrial super-large flow media transport, and adapt to large-scale transport 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.

3. Core application: What major engineering scenarios are covered?

Widely used in urban central heating main pipes, large municipal water supply and drainage pipe networks, medium-sized oil and gas gathering and transportation branch lines and main circulating water pipes in chemical parks. In the municipal scene, it can cover the core area of the whole city for energy supply and water supply, reducing the laying density of pipe network; 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.

4. Competitive advantage: Why is it the main force of medium and large scenes?

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 larger diameter pipes, the construction is more difficult and the cost is controllable. At the same time, the flow meets the needs of medium and large-scale projects, and the precise balance of "flow, strength and cost" is realized in the medium and large-scale transportation field, and the application cost performance is outstanding.