À l'heure actuelle, les pipelines sont principalement utilisés pour le transport de pétrole et de gaz sur de longues distances. Les tuyaux en acier pour pipelines utilisés dans les pipelines longue distance comprennent principalement des tuyaux en acier soudés à l'arc submergé en spirale et des tuyaux en acier soudés à l'arc submergé double face à joint droit.. Parce que le tuyau soudé à l'arc submergé en spirale est en bande d'acier et que son épaisseur de paroi est limitée, l'amélioration de la qualité de l'acier est limitée par le traitement thermique du matériau. En outre, il y a quelques défauts insurmontables des tuyaux soudés à l'arc submergé en spirale, comme une longue soudure, contrainte résiduelle importante et mauvaise fiabilité de la soudure. With the increasing requirements for oil and gas transmission steel pipes, they are no longer used in densely populated areas and areas with high reliability requirements, and large-diameter straight welded pipes are gradually replacing spiral welded pipes.

1. Recently, China is speeding up the development of oil and gas in the East China Sea. With the development of oil exploitation to the depths of the ocean, the pipeline laying on the seabed is affected by the combined forces of pressure, impact force and bending force, and the phenomenon of flattening still appears, which is the weak link of spiral welded pipe. In order to improve the pipeline transportation capacity and ensure the submarine pipeline to develop towards thick wall, the submarine pipeline mostly adopts straight welded pipe. Therefore, compared with spiral welded pipe, straight welded pipe has higher dimensional accuracy and easier repair welding, so from this aspect, straight welded pipe is also the first choice.

2. Coal slurry and slurry pipeline need to use straight welded pipe, and the pipeline transportation is “pasty”. Pipeline transportation is the upward direction. Because the weld excess height of spiral welded pipe is spiral, which has great resistance to coal slurry, and the pipe needs a large wall thickness, it is inclined to adopt straight welded pipe.

3. Machinery, construction, chemical industry and other industries need straight welded pipes. À l'heure actuelle, the inner hole of valve seat is machined after forging in mechanical industry, which is labor-consuming, time-consuming and material-consuming. If thick-walled straight seam welded pipe is used, it will be much more economical. En outre, due to the requirements of mechanical properties of anti-flattening, only straight welded pipes are used for building pipes; Straight welded pipe is also expected to be used for chemical pipes.

The company’s products are mainly used for high-,medium-and low-pressure fluid transmission pipelines and structural steel pipes such as oil, gaz naturel, eau, fumer, gas, etc., and have undertaken landmark projects at home and abroad. The products are sold to various cities and exported to more than 80 régions telles que l'Asie du Sud-Est, Middle East, Europe and America, and enjoy a high reputation in China.