Spiral steel pipe has a wide range of uses in petroleum, chemical, electric power, natural gas, refrigeration and other pipeline projects, steel structures and other industries are widely used. The strength of spiral steel pipe is generally higher than the straight seam welded pipe, can use a narrower billet to produce a larger diameter welded pipe, but also the same width of the billet to produce a different diameter of welded pipe (currently some manufacturers up to 3820mm diameter).
Thus solving the customer for large diameter seamless pipe can not solve the shortcomings. Spiral steel pipe is a widely used pipe in the current market.
1. High strength, can withstand large external impact.
It is a composite material with steel as the main raw material. It has strong corrosion resistance and resistance to water and gas penetration. No need to attach pipe trench, can be buried directly into the ground or water, easy and rapid construction, low comprehensive cost. Its thermal conductivity is: 0.013-0.035 w/m. k. The smaller the thermal conductivity, the smaller the value.
2. Chemical corrosion resistance, acid and alkali resistance, soil and marine biological corrosion resistance.
It has strong chemical corrosion resistance and resistance to soil and marine biology corrosion. Its chemical corrosion resistance is 3-4 times higher than the traditional trench laying and overhead laying. Its resistance to microbial corrosion is 4-6 times higher than other materials of the same type. Therefore, it has been widely used by the pipeline industry in recent years.
3. The installation process is mature, easy to operate, and can use manual and mechanical construction.
Due to the limitation of the structure, the spiral steel pipe used for burial is mostly double-layer epoxy powder at present. It belongs to the thermosetting material anti-corrosion. Its characteristics are lighter weight compared with epoxy powder, the coating is closely combined with the steel pipe, not easy to fall off, the coating is also more easily corroded and fall off. However, when spiral steel pipes encounter moisture and corrosion, they are still easy to rust. If this kind of steel pipe is used as insulation material in building structure (or as anti-corrosion pipe), the anti-corrosion performance of spiral steel pipe will be greatly improved. In the construction of simple, because the welded steel pipe is hot pressurized and welded; so there is a strong corrosion resistance; wear resistance, corrosion resistance; and in the temperature change will not be embrittlement and other characteristics, the service life is much longer than ordinary seamless steel pipe.
4. Smooth pipe wall and improved conveying efficiency.
Large-diameter spiral steel pipe is increasingly widely used in engineering, especially the application of large-diameter spiral steel pipe is a major initiative to save energy and reduce emissions. The production process of spiral steel pipe is an important part of the spiral pipe product formation. In the production process will produce different specifications of spiral pipe.
In the current market, spiral pipe and straight seam pipe have a common feature: they belong to the category of steel products; they can withstand pressure or fluid transfer; they are welded steel pipes; they can be used in thermal equipment and thermal pipelines and other fields; in the current wide range of use or anti-corrosion insulation pipeline field.