Main Application Of Sprial Welded Steel Pipe

Spiral welded steel pipe main use: widely used in houses, Bridges, roads and other civil engineering construction. Main origin: spiral pipe manufacturers in China are mainly distributed in north and northeast, north China, such as shougang, tangshan, xuanhua, ChengGang northeast Westwood, north Taiwan, stroke, such as steel and so on, the two regions more than about 50% of the total output of rebar.

Spiral welded pipe is widely used in natural gas, petroleum, chemical, electric power, heat, water supply and drainage, steam heating, hydropower station with the pressure steel pipe, thermal power, water and other long-distance pipeline and piling, dredging, Bridges, steel structure engineering field. Quality stand or fall of spiral welded pipe transverse reinforcement and low, often appear phenomenon of discontent, because manufacturers to achieve big minus tolerance, finished product quantity of the previous way slants big, small iron type, groove filling.

With the development of national economy and the improvement of people's living standard, the spiral welded pipe has become home to the new trend of developing the pipeline system. The company has always believed in "quality first, customer first, sincere friends, science and technology enterprise". Hebei tianyuan steel pipe manufacturing co., LTD., the idea of "cooperation, innovation, seek progress and development. I founded the company, always pay attention to the quality of products and processing management of complex products, at the same time, external to undertake a variety of difficult processing production of welded pipe business. Realize the user the value of the perfect, is our goal.

The difference between the spiral welded steel pipe and straight seam welded pipe
The metallurgical properties of materials

Straight seam submerged arc welding pipe is made of steel plate production, and the spiral weld pipe is made of hot-rolled coil plate production. Unit of hot rolling steel strip rolling technology has a series of advantages, has obtained in the production of high grade pipeline steel metallurgy process ability. For example, in the output on the bench is equipped with water cooling system to speed up the cooling, this allows to use low alloy to special strength grade and low temperature toughness, to improve the weldability of the steel. But this system in the basic no steel factory. Rolled plate alloy content (carbon equivalent) are often lower than similar grades of steel, it also improves the weldability of the spiral welded pipe.
More to be sure, as a result of the spiral welded pipe coil plate rolling direction is not perpendicular to the pipe axis direction (the spiral Angle of solution depends on the steel pipe), and straight seam steel pipe steel rolling direction perpendicular to the pipe axis direction, thus, anti-cracking performance of spiral welded pipe material is better than that of straight seam steel pipe.

Welding process,
From the welding process, the sprial welded steel pipe and DSAW steel pipe welding method is consistent, but the straight seam welded pipe will inevitably have a lot of t-shaped weld, so the probability of weld defects is also greatly improved, and the t-shaped seam welding residual stress is larger, the stress state of the weld metal are often in a three-way increases the possibility of a crack.

And, according to the regulations of submerged arc welding process, each weld shall have arc and arc in, but every straight seam welded pipe when weld girth, can not meet the conditions, thus there may be more at arc welding defects.

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