150lb 300lb Stainless Steel RF 304 316 Wn Flange
150lb / 300lb Stainless Steel Weld Neck Flanges – RF 304 / 316 – SSM
SSM supplies high-quality 304 and 316 stainless steel weld neck (WN) flanges, available in 150lb and 300lb RF (Raised Face) ratings. These flanges are designed for durable, corrosion-resistant, and leak-proof piping connections in industrial applications.
Material Composition
304 Stainless Steel:
C: ≤0.08%
Cr: 18–20%
Ni: 8–10.5%
Mn: ≤2%
Si: ≤1%
316 Stainless Steel:
C: ≤0.08%
Cr: 16–18%
Ni: 10–14%
Mo: 2–3% (provides superior corrosion resistance)
Mn: ≤2%
Si: ≤1%
Both materials offer excellent corrosion resistance, high ductility, and good weldability.
Mechanical Properties
| Material | Tensile Strength | Yield Strength | Elongation | Hardness | Operating Temp |
|---|---|---|---|---|---|
| 304 SS | 520–750 MPa | ≥205 MPa | ≥40% | ≤200 HB | -196°C to +870°C |
| 316 SS | 520–750 MPa | ≥205 MPa | ≥40% | ≤200 HB | -196°C to +870°C |
What is a Weld Neck RF Flange?
A weld neck flange features a tapered hub welded to the pipe, providing:
Even stress distribution along the hub and pipe joint
Reliable sealing when used with raised face (RF) gaskets
High mechanical strength suitable for pressure pipelines
304 / 316 stainless steel flanges are ideal for chemical, petrochemical, and marine environments due to their corrosion resistance.
Advantages
Excellent corrosion resistance in water, chemicals, and marine environments
High strength and durability – suitable for pressure piping systems
Good weldability – maintains corrosion resistance after welding
Wide temperature range – suitable for cryogenic and high-temperature applications
Limitations / Considerations
Higher cost compared to carbon steel flanges
316 is preferred over 304 for chloride or seawater applications
Not suitable for highly abrasive environments without protective coatings
Specifications
Materials: 304 / 316 Stainless Steel
Pressure Classes: 150lb, 300lb
Type: Weld Neck (WN), Raised Face (RF)
Standards: ASME B16.5
Size Range: NPS ½" – 24" (DN15 – DN600)
Applications
SSM's 150lb / 300lb 304 / 316 RF weld neck flanges are used in:
Chemical and petrochemical pipelines
Oil & gas refineries
Offshore and marine piping systems
Food and pharmaceutical processing plants
Power generation pipelines
Why Choose SSM?
Over 30 years of experience in stainless steel flange manufacturing
Advanced forging, CNC machining, and quality inspection
ISO, PED, and TS certified for quality assurance
Custom sizes, pressure classes, and finishes available
Fast global delivery and competitive pricing
Conclusion
For 150lb / 300lb stainless steel weld neck flanges RF 304 / 316, SSM provides high-quality, corrosion-resistant, and durable flange solutions for demanding industrial, marine, and chemical piping systems.
📩 Contact SSM today for quotations, technical drawings, or custom flange solutions.
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