Seamless Steel Pipe

QS Pipe: Xiamen Seamless Steel Pipe

Carbon steel seamless pipe for fluid transport, mechanical and structural use, in 1/2 to 24 inch sizes and Sch 40 to XXS walls.

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One-Minute Overview

Seamless steel pipe with no weld seam and a uniform wall around the circumference.
Carbon steel grades in 1/2 to 24 inch sizes, Sch 40 to XXS walls.
Hot finished or cold drawn, plain or bevelled ends, cut to length.
Used for fluid lines, boiler tubes, machinery and general plant piping.

Seamless steel pipe is made by piercing a solid billet and rolling or drawing it to the finished diameter, so the wall is a continuous ring of metal with no weld seam. That construction matters where pressure, fatigue or inspection rules rule out a longitudinal weld: boiler tubes, hydraulic lines, high-pressure fluid transport and many mechanical applications. Carbon steel grades cover the bulk of the work — water, oil, gas and air lines, structural members and general plant piping. Sizes run 1/2 to 24 inch, walls from Sch 40 to XXS, with plain or bevelled ends and lengths cut to order.

Name: Seamless Steel Pipe
Type: Seamless, hot finished or cold drawn
Size: 1/2-24 Inch
Schedule: Sch 40-XXS
Material: Carbon steel grades
Standard: ASTM A53 / ASTM A106 / API 5L
End: Plain End or Bevel End
Feature: Uniform wall, no longitudinal weld seam
Sizes, wall thicknesses and schedules are confirmed per inquiry, and a detailed specification sheet is available on request.

Hot finished and cold drawn pipes serve different needs. Hot finished pipe is rolled above recrystallisation temperature and suits larger diameters and heavy walls at a lower cost per tonne. Cold drawn pipe is drawn through dies at room temperature for tighter tolerances, a smoother bore and a brighter finish — handy for hydraulic lines, cylinders and equipment tubing. Either way the pipe leaves the mill normalised or annealed, straightened and tested. Choose the route by tolerance and surface requirement, then pick the schedule by pressure.

Supply quality shows up in testing and packing. Hydrostatic test is standard, with non-destructive examination available where the line is critical; wall thickness is checked at both ends and the pipe is marked with grade, size, schedule, heat number and standard. Ends are capped, bundles are strapped with steel bands and the lot is labelled for easy receiving counts. For export, seaworthy packing protects the bevels and the markings so nothing is lost in transit. Length, end preparation and test level are set with the order.

FAQ

Q1. What advantages does a seamless pipe offer over welded pipe?

No weld seam. The wall is a continuous ring, which gives uniform strength around the circumference, better fatigue behaviour and fewer inspection concerns in cyclic or high-pressure service. Seamless pipe also handles heavy wall schedules reliably. For low-pressure utility lines, welded pipe is often cheaper and perfectly adequate.

Q2. Hot finished or cold drawn — which one do I need?

Go hot finished for larger sizes, heavy walls and best cost. Go cold drawn when you need tight tolerance, a smooth bore or a bright surface — hydraulic lines and equipment tubing mostly. If you are unsure, send the application and the tolerance you care about, and the route gets picked for you.

Q3. Will I be able to tell the grade and size when the bundle lands?

Yes. Each length is marked with heat number, grade, size and schedule, bundles carry tags, and the mill test report follows the shipment. Even the caps can be colour coded by request. If your receiving team wants a specific packing list format, just say so with the order.

Q4. How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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