ASME B16.5 SS 316 Class 150 3 Inch WN RTJ Flange Manufacturer
SSM is a trusted manufacturer and exporter of ASME B16.5 SS 316 Class 150 3" Weld Neck Ring Type Joint (WN RTJ) Flanges, engineered for secure, high-integrity connections in demanding pressure and temperature conditions. These flanges are made from premium AISI 316 stainless steel, offering superior corrosion resistance, mechanical strength, and durability for a wide range of industrial piping applications.
Product Overview
The ASME B16.5 SS 316 Class 150 Weld Neck RTJ Flange is designed with a long tapered hub that provides excellent stress distribution between the flange and the pipe. The Ring Type Joint (RTJ) facing ensures metal-to-metal sealing with a precision-machined groove that accommodates an oval or octagonal ring gasket-ideal for high-pressure and high-temperature systems where leak-proof performance is critical.
Technical Specifications
| Specification | Description |
|---|---|
| Standard | ASME B16.5 |
| Flange Type | Weld Neck (WN), Ring Type Joint (RTJ) |
| Material | Stainless Steel 316 (ASTM A182 F316 / A240 Type 316) |
| Pressure Rating | Class 150 |
| Nominal Size | 3 Inch (DN80) |
| Facing Type | RTJ (Ring Type Joint) |
| Connection Type | Butt Weld |
| Temperature Range | Up to 870°C (1600°F) |
| Manufacturing Method | Forged, CNC-machined |
Key Features
Leak-Proof Metal-to-Metal Seal: RTJ face design ensures tight, reliable sealing under high pressure.
Excellent Corrosion Resistance: Ideal for chemical, petrochemical, and marine environments.
High Structural Strength: The weld neck design provides smooth stress transition and prevents fatigue.
Dimensional Accuracy: Precision machining ensures easy alignment and consistent fit.
Compliant with International Standards: Manufactured in accordance with ASME B16.5, ASTM A182, and EN 1092-1.
Available Materials
SSM offers WN RTJ flanges in a wide range of materials:
Stainless Steel: 304, 304L, 316, 316L, 321, 347
Duplex / Super Duplex: UNS S31803, S32750, S32760
Carbon Steel: ASTM A105, A350 LF2
Nickel Alloys: Inconel, Monel, Hastelloy, Incoloy
Applications
Oil & Gas and Offshore Pipelines
Petrochemical and Refinery Plants
Marine Engineering Systems
High-Pressure Steam Lines
Power Generation and Chemical Processing
Quality Assurance
All SSM flanges are manufactured under strict quality control and supplied with full certification in compliance with EN 10204 3.1 / 3.2 standards.
Testing and inspection include:
Dimensional and Visual Inspection
PMI (Positive Material Identification)
Ultrasonic or Radiographic Testing (optional)
Surface Finish and Marking Verification
Packaging & Delivery
Each SS316 WN RTJ flange is carefully protected with:
Plastic end caps on sealing faces
Anti-rust coating or wrapping
Export-ready wooden cases or pallets
Why Choose SSM
30+ years of flange manufacturing expertise
State-of-the-art forging and CNC machining facilities
Wide material range and size availability
Global export experience with competitive pricing
Fast delivery and technical support
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