Piling pipe is a kind of hollow steel pipe structure, which is usually used for bearing of foundation and supporting engineering. It can be used either as a steel pipe pile (directly as a bearing pile) or as a casing/casing (for drilling, pouring and temporary support).

ERW pipes are steel pipes that melt the edges of steel strips through resistance heating and then apply pressure to form weld seams. EFW pipes are made by melting the base material and filler metal through high temperatures generated by electric arcs or electron beams and then welding them together, which belongs to fusion welding.

Seamless rectangular tubes are steel pipes with a rectangular cross-sectional area, manufactured through a seamless process and without weld seams. It is usually made of high-quality carbon steel, alloy steel and stainless steel, featuring excellent strength, precision and corrosion resistance.

Steel sheet piles, with their high strength, excellent waterproof performance and convenient construction methods, have become an important structural material widely used in the construction field.

In the steel industry, cold rolling is a crucial finishing process. It refers to a metal processing method in which hot-rolled steel is compressed at room temperature through one or more pairs of rolls to reduce its thickness, make its dimensions more precise and its surface smoother.

Rectangular tubes, as an important structural material, are widely used in numerous fields such as construction, mechanical manufacturing, the automotive industry, and furniture production. With their excellent mechanical properties, high load-bearing capacity, and flexible specification adaptability, they have been widely applied.

In the petroleum industry, safety, efficiency and reliability are of vital importance. Among numerous application materials, seamless steel pipe plays an irreplaceable role. With its unique production process and outstanding performance, it is widely used in the drilling, transportation and refining of oil and gas, and is a key support for the entire industrial chain.

Cold rolling is an important metal processing method, widely used in the forming and processing of various metal materials such as steel, aluminum and copper. Compared with hot rolling, cold rolling is a secondary processing of metals at room temperature. Through rolling, not only can the strength and hardness of metal materials be significantly enhanced, but also their dimensional accuracy and surface quality can be effectively improved.

Hot-rolled steel and cold-rolled steel are the two most common processing methods. Although they differ by only one character, they have obvious distinctions in production processes, performance and application fields.

The pressure resistance performance of ERW steel pipes refers to their ability to resist internal pressure damage under specific conditions, which is mainly reflected through indicators such as the maximum allowable working pressure (MAWP), hydrostatic test pressure, and weld strength coefficient.

European standards EN 10210 and EN 10219 are two common types of ERW structural steel pipe standards, which differ in production processes, performance and application fields.

EN10219 is a European standard that provides detailed regulations and requirements for the dimensions, mechanical properties, chemical composition and other aspects of steel pipes.

ERW steel Pipe (Electric Resistance Welded Pipe, resistance welded pipe) is one of the most widely used types of steel pipes in modern industry. It is formed by cold rolling steel strips and then welded by resistance welding, featuring high production efficiency, good dimensional accuracy and obvious cost advantages.

When choosing steel pipes, wall thickness and pressure-bearing capacity are the two most crucial factors. The two common specifications are Schedule 10 steel pipes and Schedule 80 steel pipes.

Seamless steel pipes are a type of steel pipe without welds, mainly produced through hot rolling, cold rolling or cold drawing processes. Compared with welded steel pipes, seamless steel pipes have higher strength, better pressure resistance and a more uniform microstructure.