Steel Pipe Bend 3D 5D 8D

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

JS FITTINGS is a professional buttweld pipe bend manufacturer and exporter, specializing in carbon steel bends for high-pressure and critical-flow applications. Our bends are produced using advanced induction bending technology, ensuring superior structural integrity, minimal wall thinning, and precise ovality control.

Whether you require a standard 3D bend for compact layouts or a buttweld 5D bend for piggable pipelines, we provide bulk solutions tailored to international engineering standards (ASME, EN, MSS-SP).

What is a Steel Pipe Bend?

A steel pipe bend is a pipe bend used to change the pipeline direction. Common use radius bends are 3D bends and 5D bends. It is similar to a pipe elbow, but a pipe bend is longer than an elbow and is usually manufactured for specific needs.

Distinguishing between a Bend and an Elbow:

Pipe Bend: When the bending radius (R) is more than 2 times D (Diameter). Examples include 3D, 5D, 6D, and 8D bends.
Pipe Elbow: When the bending radius (R) is 1D or 1.5D. (Short Radius 1D and Long Radius 1.5D).

(Click here to get the difference between a pipe bend and an elbow)

Pipe Bending Radius:3D Bend, 5D Bend, 6D, 8D and customized

Bending Degrees:30°, 45°, 60°, 90°, 180° and customized

Technical Specifications

Feature	Detailed Specification
Material Grades	Standard: ASTM A234 WPB, WPC, ST37.2 High-Yield: API 5L Gr.B, X42, X52, X60, X65, X70
Bending Radius	3D, 5D, 6D, 8D, 10D, and Custom Large Radii
Bending Angles	15°, 30°, 45°, 60°, 90°, 180°, and specific custom angles
Size Range	Seamless: 1/2″ – 24″ Welded (ERW/LSAW): 24″ – 60″
Wall Thickness	SCH 20, STD, SCH 40, SCH 80, SCH 160, SCH XXS (Up to 100mm)
Standard Compliance	ASME B16.9, ASME B16.49, MSS-SP-75, EN 10253-2
End Connection	Beveled Ends to ASME B16.25 for seamless welding

Buttweld CarbonSteel Pipe Bend 3D 5D 8D

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.

Large Diameter carbon steel buttweld Pipe Bend

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.

Buttweld steel pipe bends Wholesales manufacturer

Why Partner with JS FITTINGS?

Bulk Inventory SupportLarge production capacity to fulfill container-load orders for stockholders.

Export-Ready PackagingBends are packed in seaworthy wooden cases or palletized with protective end-caps to ensure zero damage during international transit.

Technical ConsultationOur engineering team provides support for custom MTO (Material Take-Off) and technical drawings.

Request a Technical Quote

Looking for a reliable buttweld pipe bend manufacturer for your next project? Whether you need standard ASTM A234 WPB bends or high-yield API 5L grades, JS Fittings delivers quality-certified solutions on time and on budget.

Email: admin@jsfittings.com WhatsApp: +86 18003119682

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