Difference Between Seamless And Erw Pipe

Check Price Difference Between Seamless And Non Seamless Pipe

The Difference Between Seamless Pipe And Erw Pipe Cost and Production Wise

Seamless Pipe

Seamless Pipe

Welded Pipe

Welded Pipe

ERW Pipe

ERW Pipe

All Carbon steel pipe such as Casing pipe and Tubing pipe made to API specifications uses seamless or electric-weld supplying processes. There are many Differences between Seamless & ERW Pipe. The main Difference is that the Seamless Piping is suppliers by hot-working steel or, if necessary, by subsequently cold-finishing the hot-worked product to produce the desired shape, dimensions, and properties. The welded seam of electric weld pipe is heat-treated after welding to a minimum temperature of 1,000°F or processed so that no untempered martensite remains.

Such differences of erw are usually eliminated if the electric-weld tubing is heat-treated by the quenched-and-tempered process, which is mandatory for API grades L80, C90, T95, and P110. Electric-welded pipe has one longitudinal seam formed by electric-induction or electric-resistance welding without the addition of filler metal. The edges to be weld seam are pressed together mechanically, and the heat for welding is generated by the resistance to flow of electric current.

Difference Between Seamless and Erw Pipe

In both methods seamless and erw, raw material is first cast into ingots. It is then made into a pipe by forcing the edges together and sealing them with a weld or stretching the steel out into a seamless tube. While it’s true that erw pipe does include a seam that makes it supplying techniques, theoretically weaker and quality assurance regimens each have improved to the extent that welded pipe will generally perform as desired when its tolerances aren’t exceeded.

While the apparent advantage is clear, a critique of seamless piping is that the stretching and rolling process produces an inconsistent wall thickness compared to the more precise thickness of steel sheets destined for welding.The pipe is formed by the seam of the tube and moving the cut coil through a series of rollers is then welded in a chemically neutral environment. In a welded pipe, the seam or the weld-joint is the weaker part of the pipe limiting the strength of the pipe to the strength of the weld-joint. Generally, the process of supplying weld pipe begins with the rolling of a steel coil to the desired gauge thickness to form a flat strip. To produced the flat strip is cut to the width that corresponds with the size of the pipe.

Difference in Seamless Pipe Production Processes Seamless pipes are suppliers using different procedures, depending on the diameter or the ratio of diameter to wall thickness.
Seamless Pipe Raw Material Difference billet
Seamless Pipe outside diameters Difference Up to NB 100 and a diameter / wall thickness ratio of 5 : 1 or smaller
(e. g. 50 : 10, 50 : 20 etc.), for sizes larger than NB 100 normally 8 : 1 or smaller (e. g. 200 : 25, 200 : 30 etc.).
Difference in Welded Pipe Production Processes Welded pipes or ERW Pipes are suppliers from individual steel plates or coils
Welded Pipe Raw Material Difference Sheets, Plates, coils, hot rolled coil
Tolerances Difference 12.5 %, hot rolled seamless pipes, ASTM A999 or EN ISO 1127 T2
Seamless pipe length Difference 13 m Pipe up to NB 100
4 m Pipe up to NB 200
Welded pipe length Difference up to 12 m or 18 m without circumferential welds
Difference between Seamless or ERW Pipe A53, Type S means seamless.
Type F is furnace but welded,
Type E is Electrical resist welded.
Difference between seamless and non seamless pipe supplying process
  • Seamless steel pipe can be produced one time in the rolling process.
  • Welded steel pipe is supplying with steel strip or steel plate, through bending and different welding processes
Cost & Price difference between seamless and welded (ERW) Pipe Welded pipes are always cheaper comare to Seamless Pipes. If you buy Seamless Steel Pipe from India you will get better Quality & Price.

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