According to big data calculations, the global steel pipe market is expected to account for $133.2 billion in 2024 and is expected to reach $229.7 billion by 2030, growing at a CAGR of 8.1% during the forecast period. Steel pipe is a cylindrical hollow structure mainly made of steel

Steel pipes are an important part of modern infrastructure and industrial systems.

Market dynamics:

Infrastructure construction:

With the increase of urbanization and industrialization, the demand for steel pipes in various fields such as construction, oil and gas, and water treatment is growing. This trend is driven by the durability, strength and versatility offered by steel pipes, making them an essential component of infrastructure projects ranging from pipes to structural frames. As a result, the market is witnessing a surge in infrastructure development, driven by rapidly evolving construction activities worldwide.

Challenges:

The threat mainly comes from alternative materials such as plastic, copper and aluminum pipe solutions. These alternatives have lower costs, better corrosion resistance and lower weight than traditional steel pipes. As the industry seeks more cost-effective and efficient solutions, the emergence of these materials remains an important factor for steel pipe manufacturers.

Opportunity: The growing automotive industry

With the increase in global automotive production, the demand for steel pipes and tubes for various applications such as exhaust systems, chassis and structural components is increasing. In addition, stringent emissions regulations are prompting automakers to opt for lightweight but durable materials such as steel, further boosting the market. This trend is expected to continue as the automotive industry expands, driving the growth of the steel pipe market.

Spiral welded steel pipe refers to the steel strip or steel plate bending deformation into circular, square and other shapes and then welded into the surface of the joint steel pipe.

Spiral welded steel pipe common material: Q235A, Q23b,0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb. Q345 L245 L290 X42 X46 X70 X80 Spiral welded steel pipe standard: GB/T9711.1-1997 (national standard, also called oil and natural gas industry delivery steel pipe technical conditions part I: A class steel pipe (up to now strict requirements have GB/ T9711.2-B steel pipe), API-5L (American Petroleum Association, also called pipeline steel pipe; It is divided into PSL1 and PSL2 levels), SY/T5040-92 (spiral seam submerged arc welded steel pipe for pile)

Spiral welded steel pipe production process is simple, high production efficiency, low cost, rapid development. The strength of spiral welded pipe is generally higher than that of straight seam welded pipe, and it can be used to produce larger welded pipe with narrower blank, or different welded pipe with different diameter with the same width blank. But compared with the straight seam pipe of the same length, the weld length increases by 30~100%, and the production speed is lower. Therefore, small diameter welded pipe mostly use straight seam welding, large diameter welded pipe mostly use spiral welding.

The site or warehouse of thermal insulation spiral steel pipe products should be chosen in a clean place with smooth drainage and away from factories and mines producing harmful gas or dust. After cutting into a single steel pipe, each batch of steel pipe head three to carry out a strict first inspection system, check the mechanical properties of the weld, chemical composition, melting condition, spiral steel pipe surface quality and non-destructive inspection, to ensure that the pipe making process qualified, before formally put into production. Spiral steel pipe production process is simple, high production efficiency, low cost, rapid development. Remove weeds and all debris from the site and keep the steel pipe clean. In the warehouse shall not be stacked with acid, alkali, salt, cement and other corrosive materials to steel pipe. After more than a month of spiral steel pipe, the problem finally appeared in full swing. An unnamed CISA official told China Business News that according to the most conservative estimates, 70 percent of the companies are either suspending production or limiting production. When the pipe is subjected to internal pressure, there are usually two main stresses on the pipe wall, namely the radial stress δY and the axial stress δX. The synthetic stress δ=δY(L / 4Sin2 α+cos2α)1/2 at the weld, where, α is the helix Angle of the spiral steel pipe weld.

The strength of spiral steel pipe is generally higher than that of straight seam welded pipe, and it can be used to produce welded pipe with larger diameter with narrower blank, or welded pipe with different diameter with the same width blank. The weld gap control device is used to ensure that the weld gap of spiral steel pipe meets the welding requirements, and the pipe diameter, staggered edge and weld gap are strictly controlled. American Lincoln welding machine is used for single wire or double wire submerged arc welding for internal and external welding, so as to obtain stable welding specifications. More than a month ago, the European Union decided to launch a countervail investigation into Chinese spiral steel pipes, and the United States followed suit. All this is directly related to the interests of more than 3000 spiral steel pipe manufacturers in China. Before this, the capacity of this field is mostly designed in accordance with export sales.

The strength of spiral steel pipe is generally higher than that of straight seam welded pipe, and the welded pipe with larger diameter can be produced with narrower blank.

In fact, the processing effect of laser cutting machine is very good, so you can rest assured that the use of laser cutting machine processing, but after a period of time, many factors will lead to a certain reduction in the processing accuracy of laser cutting machine, so you know the processing accuracy error of laser cutting machine?

The processing precision of laser cutting machine is the main standard parameter used to measure the quality of machine tool. In the process of equipment sales, sales staff will describe the processing performance of the product in detail. Laser cutting machine processing accuracy is mainly within the error range of 0.5 mm, and some manufacturers provide high precision laser cutting machine tool processing accuracy of 0.3 mm, but generally speaking, there is still a certain range of error cutting accuracy, which is what we call the processing tolerance.

Laser cutting machine processing is based on the design of enterprise cutting drawings. Generally speaking, the dimensions of the cutting drawings of parts are clearly marked with tolerance areas and values. Considering that the tolerance zones of the cut parts are not in the same position, it may be necessary to eliminate the tolerance zones by a variety of process methods during actual cutting.

In the programming of laser cutting machine, if the method and skills are used properly, it is of great significance to ensure and improve the machining accuracy of CNC machine tools. Many dimensions of the parts have tolerances, and the position of the tolerance zone cannot be consistent. However, NUMERICAL control programs are usually programmed according to the outline of the part, that is, according to the basic dimension of the part, ignoring the influence of the position of the tolerance zone. Thus, even if the precision of CNC machine tools is very high, the machined parts may not meet their dimensional tolerance requirements.

In machining method, radius compensation can be used to compensate the influence of cutting tolerance. This method is relatively simple for the actual cutting operation. The specific idea is still to program the laser cutting machine control system according to the basic dimensions, that is, to calculate and program the parts according to the basic dimensions, and use the same turning tool to process the outer circle, but not in the process of machining different tool radius compensation values used for the same tolerance zone. In this way, we need to know the radius of the tooltip arc (the machining path of this part is parallel to the X and Z axes, so there is no need to know the radius of the tooltip arc), so it is not convenient to use, can only be used for some CNC systems.

The above machining methods may be complicated in the later cutting operation. At the initial stage of cutting, it is also possible to modify the size of the cutting parts according to the drawing requirements to eliminate the influence of the tolerance zone. The specific idea is to change the position of basic size and tolerance zone; The realization is to adjust the basic size and tolerance zone position on the premise of keeping the size of the part unchanged.

It is generally adjusted according to the symmetrical tolerance zone and the basic dimensions and tolerances after adjustment. Program according to the adjusted basic size to ensure the machining accuracy with the same turning tool and the same tool compensation value (at this time the machining path is parallel to the X axis and z axis, no tool compensation is required). Of course, if the part has to be finished (such as fine grinding), the base size can be slightly increased (the tolerance band is not symmetrical) to ensure sufficient grinding allowance.