Pipe Bend Carbon Steel — Factory Direct Supplier | Huaxia-Steel
A pipe bend is a curved pipe section that changes the direction of a piping run. Unlike a standard elbow fitting (which has a fixed radius of 1D or 1.5D and a specific angle), a pipe bend is custom-formed to any radius (typically 3D to 10D) and any angle (1° to 180°). Pipe bends are used in long-distance pipelines, refinery piping and power plant systems where smooth flow transitions, reduced pressure drop and lower stress concentration are required. Huaxia-Steel produces carbon steel pipe bends by induction bending, hot bending and cold bending.
Product Specifications
| Parameter | Specification |
|---|---|
| Standard | ASME B16.9, ASME B31.3, MSS SP-75, DIN 2605 |
| Material | ASTM A234 WPB, A53, A106 Gr. B |
| Size range | 2″ to 48″ (DN50 to DN1200) |
| Bend radius | 3D, 5D, 7D, 10D or custom (D = nominal pipe size) |
| Bend angle | 1° to 180° (common: 30°, 45°, 90°) |
| Wall thickness | SCH 10 to XXS (as per parent pipe) |
| Manufacturing method | Induction bending, hot bending, or cold bending |
| End type | Bevelled (butt-weld) or plain end |
Available Grades
| Grade | Standard | Service |
|---|---|---|
| ASTM A234 WPB | ASME | Carbon steel butt-weld bends for general piping |
| ASTM A53 Gr. B | ASME | Seamless/welded pipe bends for mechanical & pressure |
| ASTM A106 Gr. B | ASME | Seamless pipe bends for high-temperature service |
| API 5L X42/X52/X65 | API | Pipeline bends for oil and gas transmission |
| ASTM A420 WPL6 | ASME | Low-temperature carbon steel bends to -46°C |
Dimensional Reference
| NPS | 3D Bend Radius (mm) | 5D Bend Radius (mm) | Min Wall (SCH 40) |
|---|---|---|---|
| 4″ | 305 | 508 | 6.02 mm |
| 6″ | 457 | 762 | 7.11 mm |
| 8″ | 610 | 1016 | 8.18 mm |
| 12″ | 914 | 1524 | 9.53 mm |
| 16″ | 1219 | 2032 | 9.53 mm (SCH 30) |
| 24″ | 1829 | 3048 | 9.53 mm (SCH 20) |
Manufacturing Standards
- ASME B16.9 — Factory-made wrought butt-welding fittings (covers bends).
- ASME B31.3 / B31.4 / B31.1 — Piping codes governing bend design, wall thinning and installation.
- MSS SP-75 — Specification for high-test wrought butt-welding fittings.
- DIN 2605 — German standard for butt-welding steel bends.
- ASTM A234 — Standard for butt-welding fittings of carbon and alloy steel.
Bending Methods Comparison
| Method | Radius | Wall Thinning | Ovality | Best For |
|---|---|---|---|---|
| Induction bending | 3D – 10D | 5 – 10% (controlled) | < 3% | Large diameters, tight tolerances |
| Hot bending (rotary draw) | 5D – 20D | 10 – 15% | < 5% | Medium to large pipe, custom angles |
| Cold bending (rotary draw) | 5D – 20D | 5 – 10% | < 5% | Small to medium pipe, thin wall |
Applications
- Oil and gas pipelines — long-radius bends reduce pressure drop and erosion in transmission lines.
- Refinery and petrochemical piping — smooth flow transitions minimise turbulence at direction changes.
- Power plant piping — steam and feedwater lines use induction bends for stress distribution.
- Subsea and offshore pipelines
Large-radius bends for flowline and riser transitions. - Water and wastewater mains
Large-diameter bends in treatment plant piping. 
Quality Assurance
- Wall thickness measurement at intrados and extrados after bending; thinning must not exceed code limit (typically ≤ 12.5% of nominal).
- Ovality check: difference between max and min OD at bend must be within code tolerance (typically ≤ 5% for B16.9).
- PMI (Positive Material Identification) to verify grade after bending.
- Hydrostatic testing of bends to 1.5 × design pressure on request.
- EN 10204 3.1 / 3.2 MTC for both parent pipe and finished bend.
- Optional NACE MR0175 compliance for sour service applications.
Packaging and Shipping
- Bends packed on steel cradles or wooden supports shaped to the bend profile.
- Ends protected with plastic caps; bevel faces covered with bevel protectors.
- Rust-preventive oil applied to external and internal surfaces.
- Each bend marked with size, schedule, grade, radius, angle and heat number.
- Container or breakbulk loading depending on bend radius and quantity.
Get a Quote on Pipe Bends
Huaxia-Steel manufactures carbon steel pipe bends by induction, hot and cold bending in sizes 2″ to 48″ with radii from 3D to 10D and angles up to 180°. We supply A234 WPB, A106 Gr. B, API 5L and A420 WPL6 grades with full EN 10204 3.1 / 3.2 MTC. Custom wall-thinning calculations and stress reports are available. Contact us for a factory-direct quote.
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