Buttweld Steel Pipe Bend 3D 5D 8D wholesales

High-Performance Induction Bends for Oil, Gas, and Industrial Piping Systems –
ASTM A234 WPB & High-Yield Grades.



Manufacturing standard: AISI B16.49, ASME B16.9/B16.49,EN 10253-2,GOST 17375

Material: Carbon steel, Alloy steel, Stainless steel

Material standards: API 5L, ASTM A234 WPB; ASTM A403 304/304L, 316/316L.

Size: 1/2″-48″, any customized size

Radius range: R=2D, 2.5D, 3D bend, 5D bend, 6D, 8D bend

Degree range: 45 degree, 60 degree, 90 degree and customized.

Wall thickness: SCH 10, SCH 40, SCH 80

Coatings: Black paint, galvanized, epoxy coated, 3PE, FBE

3D, 5D, 6D, 8D Pipe Bends
Advanced solutions for changing pipeline directions with maximum efficiency.




3D Bend

Radius = 3 × Pipe OD.

Commonly used in refineries and compact plant layouts.



5D Bend

Radius = 5 × Pipe DN.

The industry standard for long-distance pipelines and piggable systems.




6D Bend

Radius = 6 × Pipe Diameter.

Used for moderate directional changes in specialized projects.



8D Bend

The Longest Common Radius.

Provides the maximum smooth transition for fluid transport.




Large Diameter Pipe Bending

In oil and gas transmission, large-diameter pipe bends are critical for high-
capacity flow. We provide customized radii (3D to 10D) to ensure seamless
installation in complex geological conditions and long-distance high-pressure
pipeline projects.









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3D vs. 5D Bends: Choosing the Right Geometry

As a specialized buttweld pipe bend supplier, we help our clients select the
optimal radius for their specific flow dynamics:


3D Carbon Steel Bends (R=3D)
Often used in refinery and chemical plant processing where space is constrained
but a smoother flow than a standard long-radius elbow (1.5D) is required.
5D Carbon Steel Bends (R=5D)
The industry standard for long-distance transport pipelines. The buttweld 5D
bend is essential for “piggability”—allowing cleaning and inspection tools
(PIGs) to pass through the system without obstruction. It also significantly
reduces pressure drop and internal turbulence.



Advanced Manufacturing & Quality Control

Our reputation as a buttweld pipe bend exporter is built on our rigorous
“Zero-Defect” manufacturing process:


Induction Bending Process:


▶Local Heating: We use high-frequency induction coils to heat a narrow
circumferential band of the pipe to the forging temperature.

▶Precision Forming: Hydraulic rams push the pipe through a pivoting arm,
creating the exact 3D or 5D radius with minimal mechanical stress.

▶Post-Bend Heat Treatment: To restore the mechanical properties of the carbon
steel, all bends undergo Normalizing or Stress Relieving according to ASTM
standards.

▶Surface Protection: Finished products are treated with black varnish, anti-
rust oil, or specialized FBE/3PE coating for long-term corrosion resistance.


Inspection & Testing:


✓Dimensional Integrity: Strict monitoring of wall thinning (not exceeding 10-
12%) and ovality.

✓Non-Destructive Testing (NDT): 100% Ultrasonic (UT) and Magnetic Particle
Inspection (MPI).

✓Certification: Full Material Test Certificates (MTC) provided per EN 10204
3.1 for every batch.

Minimum Order: 5 tons