Reliable Connections for Demanding Piping Systems
Baojing Steel supplies a wide range of stainless steel flanges designed for secure, leak-resistant connections between pipes, valves, pumps and other piping components. Available in multiple flange types, pressure classes, sizes and stainless steel grades for demanding industrial applications.
Flange Types
| Type | Key Features | Typical Applications |
|---|
| Weld Neck Flange | Tapered hub design provides excellent stress distribution and high-pressure performance. | Oil & Gas, Petrochemical, Power Generation, High-Pressure Piping |
| Slip-On Flange | Easy to install and weld; practical and cost-effective for general piping. | General Industrial Piping, Water Treatment, Low-to-Medium Pressure Systems |
| Blind Flange | Used to close or isolate pipelines, valves and equipment nozzles. | Pipeline Isolation, Pressure Testing, Maintenance & Equipment Connections |
| Socket Weld Flange | Compact design with strong welded connection, mainly for smaller pipe sizes. | High-Pressure Small-Bore Piping, Chemical & Process Systems |
| Threaded Flange | Connects to threaded pipes without welding; suitable for specific installation conditions. | Utility Piping, Low-Pressure Systems, Applications Where Welding Is Restricted |
| Lap Joint Flange | Rotating flange allows easy alignment and disassembly; used with Lap Joint Stub Ends. | Frequent Maintenance, Large-Diameter Piping, Corrosive Service |
| Orifice Flange | Specially designed for orifice plates and differential-pressure flow measurement. | Flow Measurement, Process & Chemical Piping |
Common Stainless Steel Grades
| Grade | Key Characteristics | Typical Applications |
|---|
| 304 / 304L | Good corrosion resistance and weldability | General Industrial, Food & Beverage, Water |
| 316 / 316L | Enhanced chloride and chemical resistance | Chemical, Marine, Petrochemical |
| 321 | Excellent resistance to elevated temperatures | High-Temperature Piping |
| 310S | Excellent oxidation and heat resistance | Furnaces, Heat Treatment, High-Temperature Equipment |
| 2205 Duplex | High strength and excellent chloride resistance | Oil & Gas, Marine, Chemical |
| 2507 Super Duplex | Exceptional corrosion resistance and strength | Offshore, Seawater, Severe Corrosion |
| 904L | Excellent resistance to highly corrosive media | Chemical Processing, Sulfuric Acid Service |
Pressure Classes & Specifications
Available in a wide range of pressure ratings and dimensions, including:
Class 150 | 300 | 600 | 900 | 1500 | 2500
Other pressure ratings and customized specifications are available according to project requirements.
Key Specifications
| Item | Available Options |
|---|
| Type | Weld Neck / Slip-On / Blind / Socket Weld / Threaded / Lap Joint / Orifice |
| Material | 304/304L, 316/316L, 321, 310S, 2205, 2507, 904L & More |
| Size | Customized |
| Pressure Rating | Class 150–2500 |
| Facing | RF / FF / RTJ / Customized |
| Bore | Standard / Customized |
| Surface | Pickled / Machined / Polished / Custom |
| Inspection | MTC, PMI, Dimensional & NDT as required |
Standards
Our stainless steel flanges can be supplied according to major international standards:
ASME B16.5 | ASME B16.47 | ASTM A182 | EN 1092-1 | DIN | JIS | GB/T
For larger-diameter flanges, ASME B16.47 provides dimensional requirements for large-size steel flanges.
Applications
Oil & Gas | Chemical & Petrochemical | Food & Beverage | Pharmaceutical | Marine & Offshore | Water Treatment | Power Generation | HVAC | Industrial Piping
Quality Inspection
Inspection and testing are performed according to applicable standards, product specifications and customer requirements.
Chemical Composition | Mechanical Properties | Dimensional Inspection | Visual & Surface Inspection | PMI | Hardness Testing | Hydrostatic / Pressure Testing | PT / RT / UT | IGC Testing
Quality Documentation
EN 10204 3.1 / 3.2 | MTC | Inspection Reports | Test Certificates | Material Traceability
Third-party inspection by SGS, TÜV, BV, DNV or customer-approved agencies is available upon request.
Why Baojing Steel?
Wide Flange Selection
Multiple flange types, pressure classes and facing options for different piping configurations.
Corrosion-Resistant Materials
From 304L and 316L to Duplex 2205, Super Duplex 2507 and 904L.
International Standards
Products supplied according to ASME, ASTM, EN, DIN, JIS and GB/T requirements.
Customized Solutions
Special dimensions, pressure ratings, facing, bore and material requirements can be supplied according to drawings and project specifications.
Engineered for Secure Connections. Built for Long-Term Performance.
Baojing Steel provides stainless steel flanges for critical piping systems where connection reliability, corrosion resistance and dimensional accuracy matter.
