Large Diameter Welded Pipe type

ERW welded pipe, SAWL welded pipe, SAWH welded pipe, EFW welded pipe, HFW welded pipe, CS pipe, Mild pipe

Large Diameter Welded Pipe specification:

Outer diameter: 16”-100” (406mm-2540mm)

Wall thickness: 6mm-80mm

Length: 3m-14m

Surface: oiling, spraying black paint ( or varnish), galvanized, 3PE, FBE epoxy anti-corrosion coating etc.

Large Diameter Welded Pipe Application

Widely used in industry, chemical industry, construction, water treatment, agricultural irrigation, highway billboards, fire fighting , bridge supporting , gas & oil conveying, mine and oilfield drilling.

Large Diameter Welded Pipe Inspection

hydrostatic testing, ultrasonic testing, eddy current testing, magnetic particle testing, impact testing, hardness testing, etc.

Large Diameter Welded Pipe Package and storage

Safe and Seaworthy packing suitable for export; As per customer’s requirement.

Large Diameter Welded Pipe Major Technical Characters

I. During the forming process, the deformation of the plate is very uniform and the residual stress is very low and there is less scratch on the surface. The production range on the wall thickness and pipe diameter is very flexible. For the high strength material with small pipe diameter and heavy wall thickness this process has more advantages than other pipe production process. More requirements on the product range from customers can be met.

Ⅱ. The welding can be performed at an optimal position so the welding quality is easy to control because the inside welding and outside welding are performed after the tack welding. The welding defects such as the offset, deflection and lack of penetration are very seldom to occur.

Ⅲ. The full-length mechanical expansion of the pipe can effectively increase dimension precision and improve the internal stress distribution of the steel pipes, thus avoid damage due to stress corrosion. The expanded pipes are very convenient for site application.

Ⅳ.The automatic on-line NDT test,composing of PID control automation,on-line automatic UT and RT nondestructive testing 100% control system guarantees the product quality maximum.

Large diameter welded pipequality inspection:

1. Our factory has its own "experimental testing center".CNAS Laboratory Accreditation Certificate

2.Control quality strictly.The first pass is the quality inspection on the production line,The second pass is full inspection of the  production quality .

3.We have got internationally recognized certificates, ISO, CE, LR,Philippine certificate,also support third-party testing,as SGS, BV, ect.

Large Diameter Welded Pipe feature

The UOE mill features the most advanced technology and process, achieves high production efficiency, stable product quality and is equipped with complete inspection equipment. UOE mill adopts U & O forming, the formed pipes are welded inside through five internal welding stations with three wires, and welded outside through four external welding stations with three wires. In accordance with different requirements of the customers, the welded pipe can be expanded either by mechanical or hydrostatic expand to improve dimensional accuracy, and eliminate residual stress.

Large diameter welded pipe generally adopts double-sided submerged arc welding welding process, which can be divided into large diameter straight seam welded pipe and large diameter spiral welded pipe according to the different welds. UOE, RBE, JCOE steel pipes, etc.

The production process of the large diameter straight seam welded pipe is simple, the production efficiency is high, and the cost is low, while the strength of the large diameter spiral welded pipe is generally higher than that of the straight seam welded pipe. The billet produces welded pipes and frame pipes with different pipe diameters, but the production efficiency is lower than that of straight seam steel pipes. Large diameter welded pipe is mainly used in large-scale pipeline projects, water and gas transmission projects, urban pipeline network construction, municipal engineering, water supply and drainage projects, large-scale building steel structures, pile foundations, etc. The main detection method of Large diameter welded pipe is mainly flaw detection. A combination of machine welding and manual welding is used.