Structual Welded Pipe

Out diameter usually from 323mm to 1420mm. When the outer diameter is above 914.4mm it's allowed two straight welded seams.

Usage: Long distance transportation for oil, gas, liquid, coal gas, etc. inshore and offshore, also used as construction pipes, offshore platform, power station, petrochemical and civil construction, etc.

Outer Diameter: 219mm-1820mm (8'' ~70'')

Wall Thickness: 5.0mm-50mm

Length: 5.8mtr-18mtr

End: square ends (straight cut, saw cut, and torch cut). or beveled for welding, beveled,

Surface: Lightly oiled, Black, Bare, Varnish coating/Anti rust oil, Protective Coatings

MATERIAL: CS, LTCS Q235, Q345, ASTM A25, API 5L GR.B, X42, X46, X52, X60, X70, etc.

STANDARD: API 5L, ASTM A252, ASTM A672, ISO3183, GB/T3091, GB/T9711, etc.

【Product Features】

High Strength
Structural welded pipe uses high-quality low-alloy high-strength steel (Q355B) as the base material, with a yield strength of up to 355MPa and a tensile strength of 470-630MPa. Compared with ordinary carbon steel, its strength is increased by about 30%.

High Dimensional Accuracy
During the production process of structural welded pipe, high-precision dimensional control is achieved through the collaborative operation of the three-roll sizing machine and the intelligent online detection system. The pipe diameter tolerance can be strictly controlled within ±0.5mm, the roundness error is less than 1%, and the wall thickness deviation does not exceed ±0.2mm, ensuring that each pipe meets the precise standard.

Good Processing Performance
Structural welded pipe strictly controls the carbon equivalent (CEV) below 0.42%, which gives it excellent cold bending, flaring and welding performance. It can easily complete 90° bending and forming, and there is no crack when the flaring rate reaches 30%, which greatly facilitates on-site processing and installation operations.

【Product Application】

Construction Engineering Field
In construction engineering, structural welded pipe is often used as the load-bearing frame and support structure of large buildings such as buildings and bridges.

Machinery Manufacturing Field
In the machinery manufacturing industry, structural welded pipe is widely used to manufacture various equipment support frames, mechanical arms and moving parts of conveying systems.

Transportation Field
In the process of automobile, rail transportation and ship manufacturing, structural welded pipe is often used in the manufacture of body frames, anti-collision beams and guardrails.

Municipal Engineering Field
In municipal construction, structural welded pipe is widely used in guardrails, street light poles, drainage pipe networks and municipal pipe corridor systems.

【Frequently Asked Questions】

What is a structural welded pipe?
Structural welded pipe is a hollow steel made of steel plate or steel strip, formed and welded, and is widely used in construction, machinery manufacturing and other fields.

What are the common materials for structural welded pipe?
Common materials for structural welded pipe include carbon structural steel such as Q235 and Q345 and low-alloy high-strength steel.

How is structural welded pipe used in the construction field?
Structural welded pipe can be used for building frames, scaffolding and steel structure bridges.

What are the requirements for packaging and transportation of structural welded pipe?
Structural welded pipe is protected by bundling and pipe caps to prevent collision and deformation during transportation. Long-distance transportation needs to be covered with waterproof cloth to avoid rain erosion; the stacking height of pipe fittings should not exceed 2 meters to prevent pressure loss.

What is the core difference between structural welded pipe and seamless steel pipe?
Structural welded pipe is formed by curling and welding steel plates, with low production cost but slightly lower strength at the weld; seamless steel pipe adopts perforated hot rolling or cold drawing process, has no weld defects, is suitable for high-pressure scenarios, but has higher cost.

What are the technical points of structural welded pipe connection?
Flange connection needs to control the bolt preload torque, threaded connection needs to use sealant, welding connection needs to be preheated to 150℃ to eliminate the risk of hydrogen-induced cracking, and socket connection needs to ensure that the rubber ring compression rate is 30%-40%.

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