ASME B16.5 & B16.47 Forged Weld Neck Flanges
Precision-forged and CNC-machined weld neck flanges engineered for critical high-pressure oil, gas, chemical, and steam pipelines.
ASME B16.5 / B16.47 Forged Weld Neck Flange (WNRF / RTJ)
Starlight Tubes is a premier manufacturer and exporter of forged Weld Neck Flanges per ASME B16.5, ASME B16.47 Series A/B, and EN 1092-1. Forged from certified closed-die billets, our weld neck flanges provide superior grain flow, high fatigue strength, and complete pressure containment in severe operating conditions.
We manufacture weld neck flanges in ASTM A105, ASTM A350 LF2, ASTM A182 (F304/304L, F316/316L, F321, F51, F53, F55), Inconel 625, and Monel 400. All flanges undergo 100% dimensional inspection, magnetic particle / dye penetrant testing, and full PMI verification.
Technical Specifications
ASTM / ASME CompliantTechnical Specifications — Forged Weld Neck Flanges
Pressure ratings, standard dimensions, and forging specifications for ASME B16.5
| Pressure Class | Working Pressure (psi at -29°C to 38°C) | Hydrostatic Shell Test (psi) | Standard Face Types |
|---|---|---|---|
| Class 150# | 285 psi | 450 psi | Raised Face (RF) 1/16" |
| Class 300# | 740 psi | 1125 psi | Raised Face (RF) 1/16" / RTJ |
| Class 600# | 1480 psi | 2225 psi | Raised Face (RF) 1/4" / RTJ |
| Class 900# | 2220 psi | 3350 psi | Raised Face (RF) 1/4" / RTJ |
| Class 1500# | 3705 psi | 5575 psi | Raised Face (RF) 1/4" / RTJ |
| Class 2500# | 6170 psi | 9275 psi | Ring Type Joint (RTJ) |
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ASME B16.5 Forged Slip-On Flanges
Cost-effective forged slip-on raised face (SORF) flanges for easy alignment and dual fillet weld fabrication
ASME B16.5 Forged Blind Flanges
Solid forged blanking flanges (BLRF / RTJ) in carbon steel, stainless steel, duplex, and superalloys
ASME B16.5 & B16.47 Forged Flanges
Precision forged and CNC-machined high-pressure piping flanges for offshore, petrochemical, and power generation
Direct Manufacturer of Forged Weld Neck Flanges
Starlight Tubes provides CNC-machined weld neck flanges with complete MTC EN 10204 3.1, NDT inspection, and rapid global delivery.
Frequently Asked Questions on ASME B16.5 Forged Weld Neck Flanges
Key engineering, tolerance, and international compliance answers from our metallurgical quality desk.
The long tapered hub transfers stress directly from the flange to the pipe, providing high structural rigidity and resistance to bending moments under severe pressure and thermal cycles.
Request Project Quotation for ASME B16.5 Forged Weld Neck Flanges
Submit your required sizes, wall thicknesses, material grades, and total tonnage. Our technical sales engineers respond with complete mill pricing and lead times within 24 hours.