Seamless steel pipes are perforated from whole round steel, and steel pipes without welds on the surface are called seamless steel pipes. According to the production method, seamless steel pipes can be divided into hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, extruded seamless steel pipes, and top pipes. According to the cross-sectional shape, seamless steel pipes are divided into two types: round and special-shaped. Special-shaped pipes include square, oval, triangular, hexagonal, melon seed, star, and finned pipes. The maximum diameter is 900mm and the minimum diameter is 4mm. According to different purposes, there are thick-walled seamless steel pipes and thin-walled seamless steel pipes. Seamless steel pipes are mainly used as petroleum geological drilling pipes, cracking pipes for petrochemical industry, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors, and aviation.

API seamless pipe have a hollow section and are used in large quantities as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter in flexural and torsional strength and is an economical section steel. Widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle frames, and steel scaffolding used in construction. Steel pipes are used to make ring parts, which can improve material utilization, simplify manufacturing procedures, and save materials and processing. Working hours.

Carbon Steel Pipes

A seamless steel pipe is a circular pipe having a hollow section and no seams around it. The ASTM seamless pipe is made of carbon steel, alloy steel, stainless steel ingot or solid tube blank, and then is made by hot rolling, cold rolling or cold drawing. Seamless pipes are considered superior to welded pipes as they are built using monolithic steel billets, with intrinsic mechanical strength, without seam welds.

What is a seamless steel pipe?

A seamless steel pipe is a circular pipe having a hollow section and no seams around it. The seamless steel pipe is made of carbon steel, alloy steel, stainless steel ingot or solid tube blank, and then is made by hot rolling, cold rolling or cold drawing. Seamless pipes are considered superior to welded pipes as they are built using monolithic steel billets, with intrinsic mechanical strength, without seam welds.

Characteristics of seamless steel pipe

Seamless steel pipe for the use of engineering and construction is very widely, it is a hollow steel strip no seams, it is mainly used to transport liquids pipelines, different look and general steel,one of those heavy type steel, it has a strong resistance to corrosion, resistant to general corrosion.

Will not rust, this performance makes seamless steel tubes extend the life, the most important is that it is very clean and no toxins.

Compared with other plastic seamless steel pipe having strong mechanical resistance, impact regardless of how high a temperature is not interested in the use of seamless steel pipe, it is mounted and the other pipe is the same, can replace other piped water and other liquids.

Since the industrial applications have become complex and evolved a lot, the piping products are also changing to stay in the race. Although there are many pipe processing techniques, the industry’s most influential controversy between electrical resistance welded and spiral steel pipe.

As they are produced, some seamless pipe types harden, so heat treatment after production is not needed. Others need thermal therapy. Consult the seamless pipe form specification you are considering to learn if heat treatment would be needed.

As alternatives today, ERW and seamless steel piping remain primarily due to historical beliefs.

Generally, since a weld seam was used, the welded pipe was deemed inherently weaker. This supposed design weakness was absent from the seamless pipe and was deemed safer. Although it is true that welded pipe has a seam that makes it technically weaker, manufacturing processes and quality assurance regimes have all advanced to the degree that when its tolerances are not exceeded, welded pipe can work as expected. While the obvious benefit is apparent, a criticism of seamless piping is that, compared to the more reliable thickness of steel sheets intended for welding, the rolling and stretching process creates an inconsistent wall thickness.

These perceptions are still expressed by the industry standards that regulate the production and specification of ERW and seamless steel pipes. For example, for many high-pressure, high-temperature applications in the oil & gas, power generation and pharmaceutical industries, seamless piping is needed. Welded piping (which is typically cheaper to manufacture and is more commonly available) is defined in all industries as long as the parameters noted in the relevant specification do not exceed the temperature, pressure and other service variables.

There’s no difference in efficiency between ERW and pile pipe in structural applications. Although the two can be interchangeably defined, since cheaper welded pipe works just as well, it does not make sense to specify for seamless.

Healthy welded and seamless steel pipe buying procedure

As piping products are listed for a project, an important note to be made is that the specification books (such as those supplied by ASTM, ASME, ANSI and API, among others) that engineers use to direct the specifications they write only list pipe grades exclusive of referencing whether they are generated through ERW or seamless pipe production. By both ways, not all grades can be made.

For example, if an engineer defines welded pipes with a wide outside diameter and wall thickness without understanding that it would be difficult to produce them, a potential mix-up could occur. Until a purchase order is placed, this mistake would possibly go unnoticed, at which point an industrial pipe supplier would tell the customer that the order could not be fulfilled as written. See us at International Pipe Suppliers for the supply.

The development of numerical simulations is potentially useful in predicting the most suitable manufacturing processes and ultimately improving product quality. Seamless pipes are manufactured by a rotary piercing process in which round billets (workpiece) are fed between two rolls and pierced by a stationary plug. During this process, the material undergoes severe deformation which renders it impractical to be modelled and analysed with conventional finite element methods. In this paper, three-dimensional numerical simulations of the piercing process are performed with an arbitrary Lagrangian–Eulerian (ALE) formulation in LS-DYNA software. Details about the material model as well as the elements’ formulations are elaborated here, and mesh sensitivity analysis was performed. The results of the numerical simulations are in good agreement with experimental data found in the literature and the validity of the analysis method is confirmed. The effects of varying workpiece velocity, process temperature, and wall thickness on the maximum stress levels of the product material/pipes are investigated by performing simulations of sixty scenarios. Three-dimensional surface plots are generated which can be utilized to predict the maximum stress value at any given combination of the three parameters.