welded and seamless steel pipe

Steel Pipe: The Choice of Welded and Seamless Variations

Hollow metal with a round or oval cross-section is commonly classified as either “pipe” or “tube”, even though there are distinct technical contrasts between the two. Pipe fabrication is typically achieved by extruding or piercing a hot rolled bar, while tubes stem from piercing a hot rolled coil.

A wide range of sizes and grades of pipe are available for purchase that are typically designated as Nominal Bore or Nominal Diameter. Apart from the usual Carbon Steel and Stainless Steel options, many Alloy Steel and metal variants can be found. For Carbon Steel and Stainless Steel pipes, the wall thickness is given according to Schedule numbers, while the thickness for Alloy Steel and other metals is specified in inches.

The production of pipes is carried out in two distinct ways. Welded pieces are shaped by forming a plate or ribbon into a cylinder and welding the edges together. Seamless pipes, meanwhile, are formed by puncturing a heated roll of steel to create a hollow cylinder.

Welded and Seamless pipes each boast their own set of advantages – while Welded pipes are formed from a flat plate or strip and welded along the seam, Seamless pipes are made by piercing a hot rolled coil to form a hollow cylinder. Although it is generally more expensive to manufacture, the Seamless variant offers enhanced mechanical properties and finish.

From slender circumference to outsized diameters and beyond, the spectrum of welded pipes is expansive. In stark contrast, larger sizes of the more costly seamless variety are a rarity.

A flat plate or strip is twisted into a cylindrical shape and its edges are then affixed together in the welding process to create welded pipe. Welding this tube together instead of forming it in one single piece results in much more affordable pipe when compared to seamless options. Yet, due to such economical methods, the finished item’s mechanical properties may not be quite as optimal and its appearance more than likely falls below that of seamless pipe due to imperfect sealant applications.

Crafted from a single hot-rolled coil that is punctured to form a hollow cylinder, seamless pipe has proven to be advantageous in terms of both its mechanical properties and its pristine finish. However, its fabrication usually comes with a more extended price tag.


Post time: 2023-07-01

Related Product

  • Hot Dip Galvanized Round Steel Pipe

    Hot Dip Galvanized Round Steel Pipe

    Yuantai Derun Steel Pipe Manufacturing Group produces hot-dip galvanized round steel pipes, which are sold directly by manufacturers, support customization, and have guaranteed qua […]

  • Scaffold Steel Pipe

    Scaffold Steel Pipe

    Introduction to scaffold steel pipe Scaffold steel pipes are generally called scaffold pipes, which is a special term used by people in building or construction. Scaffold steel pip […]

  • LSAW Steel Pipe(Longitudinally Submerged Arc Welding Tube)

    LSAW Steel Pipe(Longitudinally Submerged Arc Welding Tube)

    Lsaw Steel Pipe(Longitudinally Submerged Arc Welding Tube) JCOE is a pipe making technology for the production of large diameter thick wall steel pipes. It mainly adopts the produc […]

  • Round Seamless Steel Pipe

    Round Seamless Steel Pipe

    Seamless steel pipe is a steel pipe formed by piercing the whole round steel, and there is no weld on the surface, which is called seamless steel pipe. According to the production […]

  • Spiral Welded Steel Pipe

    Spiral Welded Steel Pipe

    Spiral welded steel pipe introduction Spiral welded steel pipe refers to the steel pipe with joints on the surface, which is welded after the steel strip or steel plate is bent and […]

  • ERW Round Steel Pipe

    ERW Round Steel Pipe

    Standard:Hollow section:ASTM A500/501,EN10219/10210, JIS G3466,GB/T6728/T3094/3091,CSA G40.20/G40.21 Section Shape: round OD(outer meter): 10.3mm-609mm Application: Structural type […]

  • Pre Galvanized Round Steel Pipe

    Pre Galvanized Round Steel Pipe

    The round pipe with galvanized strip is made of galvanized strip steel, which is generally 0.6MM-2MM. It is processed and formed at one time, with the specification of 15 * 15-100 […]

  • GI Circular Steel Pipe

    GI Circular Steel Pipe

    Galvanized round steel pipe Generally, there are two major categories: pre galvanized round steel pipes and hot-dip galvanized round steel pipes. Hot dip galvanized pipe is to make […]

  • Round Welded Pipe

    Round Welded Pipe

    Since the 1930s, with the rapid development of continuous rolling production of high quality strip steel and the progress of welding and inspection technology, the quality of weld […]