ASME B16.9 WP304 BW 90° LR Elbow
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If you are looking for an ASME B16.9 WP304 BW 90° LR Elbow for industrial piping systems, GNEE supplies stainless steel butt weld elbows manufactured according to ASME B16.9 requirements. Made from ASTM A403 WP304 stainless steel, this long radius elbow provides smooth flow direction changes, reliable welding performance, and corrosion resistance for applications including chemical processing, water treatment, food processing, and general industrial piping.
What Is an ASME B16.9 WP304 BW 90° LR Elbow?
An ASME B16.9 WP304 BW 90° LR Elbow is a factory-made stainless steel butt welding fitting used to change the direction of piping by 90 degrees. The BW (Butt Weld) connection allows the elbow to be welded directly to the pipe, creating a continuous piping system with reduced leakage risk.
The LR (Long Radius) design means the centerline radius is typically 1.5 times the nominal pipe size (1.5D), providing lower pressure loss and smoother fluid flow compared with short radius elbows. ASME B16.9 defines dimensions, tolerances, and requirements for factory-made wrought butt welding fittings.
ASME B16.9 WP304 Elbow Manufacturing Process:
The typical production workflow includes: raw material inspection, pipe cutting, hot or cold forming, heat treatment (where necessary), end beveling, surface pickling and cleaning, dimensional inspection, PMI (Positive Material Identification) testing, and final marking and packaging.
Each production step contributes to ensuring dimensional accuracy, welding compatibility, and material traceability.
ASME B16.9 WP304 BW 90° LR Elbow Specification
| Property | Description / Requirement |
| Standard (Dimensional) | ASME B16.9 |
| Material Grade | ASTM A403 WP304 / 304L (Seamless/Welded) |
| Fitting Type | 90° Elbow, Long Radius (LR) |
| Connection Type | Butt-Weld (BW) |
| Size Range | NPS 1/2" to 48" (DN15 to DN1200) |
| Wall Thickness | Sch 5S, 10S, 40S, 80S, STD, XS, XXS (per ASME B36.10/B36.19) |
| Manufacturing Method | Seamless or Welded (per ASTM A403) |
| Surface Finish | Pickled and Passivated (or Solution Annealed) |
| End Preparation | Beveled end (per ASME B16.25) |
| Marking | Stencil per MSS SP-25 (Brand, Size, Sch, Grade, Heat No.) |
| Inspection & Testing | Visual, Dimensional, PMI, Hydrostatic (if required) |
| Certification | Mill Test Certificate (MTC) EN 10204 3.1 |
ASME B16.9 WP304 LR Elbow Dimensions
ASME B16.9 provides dimensional requirements for long radius butt welding elbows. For a 90° LR elbow, the center-to-end dimension is defined according to nominal pipe size.
| NPS | Outside Diameter | 90° LR Center-to-End (A) |
|---|---|---|
| 2" | 60.3 mm | 76 mm |
| 4" | 114.3 mm | 152 mm |
| 6" | 168.3 mm | 229 mm |
| 8" | 219.1 mm | 305 mm |
| 10" | 273.0 mm | 381 mm |
| 12" | 323.8 mm | 457 mm |
| 16" | 406.4 mm | 610 mm |
| 24" | 610.0 mm | 914 mm |
ASTM A403 WP304 Chemical Composition
(Max, unless range or min is specified)
| Element | ASTM A403 WP304 | ASTM A403 WP304L |
| Carbon (C) | 0.08 max | 0.030 max |
| Manganese (Mn) | 2.00 max | 2.00 max |
| Phosphorus (P) | 0.045 max | 0.045 max |
| Sulfur (S) | 0.030 max | 0.030 max |
| Silicon (Si) | 1.00 max | 1.00 max |
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 11.0 | 8.0 – 12.0 |
| Nitrogen (N) | 0.10 max | 0.10 max |
ASTM A403 WP304 Mechanical Properties
Minimum value at room temperature
| Property | WP304 | WP304L |
| Tensile Strength (min) | 75 ksi (515 MPa) | 70 ksi (485 MPa) |
| Yield Strength (min) | 30 ksi (205 MPa) | 25 ksi (170 MPa) |
| Elongation in 2 in. (50mm) | 35% | 35% |
| Hardness (HBW / HRB) | 201 HBW / 92 HRB (Max) | 201 HBW / 92 HRB (Max) |
What is the difference between WP304 and F304 for ASME B16.9 elbows?
ASTM A403 WP304 is the standard grade for factory-made butt-welding pipe fittings (seamless or welded).
ASTM A182 F304 strictly falls under the standard for forged flanges and forged pipe fittings.
In actual procurement, butt-welding elbows-whether formed from seamless pipe or plate-are designated as A403 WP304; however, in market transactions and Material Test Reports (MTCs), the terms WP304 and F304 are often used interchangeably, as their chemical composition and mechanical property requirements are identical.
Why is WP304L preferred over WP304 for welding applications?
WP304L is a low-carbon grade (C ≤ 0.03%); during butt welding, it effectively prevents chromium carbide precipitation (sensitization) in the heat-affected zone, thereby avoiding intergranular corrosion. Most major modern steel mills supply the material with dual certification (WP304/WP304L).
Applications of ASME B16.9 WP304 90° Long Radius (LR) Elbows
Chemical Production: Used in process piping systems requiring moderate corrosion resistance and welded connections.
Food and Beverage Industry: Food processing piping systems.
Water Treatment: Used in water transmission pipelines, filtration systems, pumps, and equipment connections.
Industrial Equipment: Commonly installed in heat exchangers, pressure piping systems, storage tanks, and various types of machinery.
WP304 90° Long Radius Elbows Price
Prices for ASTM A403 WP304 90° long radius stainless steel elbows generally start around $11.90 for smaller 3/4-inch schedule 10S sizes and scale up depending on the diameter and pipe schedule.
To assist us in providing an accurate quote, could you please provide the following information:
The specific pipe size (diameter) required, the desired wall thickness class (e.g., SCH 10, SCH 40, or SCH 80), and the planned purchase quantity?
Quality Inspection
GNEE performs quality inspection for ASME B16.9 WP304 BW 90° LR Elbows, including PMI material verification, dimensional measurement, visual inspection, and heat-number traceability. Inspection focuses on outside diameter, center-to-end dimension, wall thickness, bevel angle, surface condition, and ovality according to ASME B16.9 requirements. Each batch can be supplied with ASTM A403 WP304 EN 10204 3.1 material certificates, inspection reports, and third-party inspection support such as SGS or BV according to customer requirements.
Packaging and Delivery
For international shipment, F304 butt-weld elbows are typically packaged as follows:
Beveled ends fitted with plastic protective caps
Anti-rust treatment applied upon request
Wooden cases or steel pallets
Clear product labeling
Heat number identification
Packing lists and shipping documents
Proper packaging prevents surface damage and deformation during sea transport.
FAQ
Which standard covers stainless steel butt-weld elbows?
The ASME B16.9 standard covers factory-made wrought butt-welding fittings, including the dimensions and technical requirements for elbows.
What is ASTM A403 WP304?
ASTM A403 WP304 is a material specification for wrought austenitic stainless steel fittings intended for pressure piping components.
What does "LR" stand for in butt-weld elbows?
LR stands for Long Radius. The radius of curvature for these elbows is typically 1.5 times the nominal pipe size, which helps reduce fluid turbulence and pressure loss.
What is the difference between LR and SR elbows?
LR Elbow SR Elbow
Radius = 1.5D Radius = 1D
Lower pressure loss More compact installation
Common in process piping Used in space-constrained applications
Can F304 elbows be welded?
Yes. F304 stainless steel has excellent weldability and is commonly used in welded piping systems.
What inspection documentation is available?
GNEE typically provides documents such as EN 10204 3.1 Material Test Certificates (MTC), PMI (Positive Material Identification) reports, dimensional inspection reports, and third-party inspection documentation upon request.
