316 Stainless Steel Long Weld Neck Flange ASME B16.5 12" Class 150
316 Stainless Steel Long Weld Neck Flange ASME B16.5 12" Class 150
SSM offers high-quality 316 stainless steel long weld neck flanges in 12-inch Class 150 configurations, precisely manufactured to ASME B16.5 standards. This flange is ideal for critical services where added neck length is required for reinforcement and stress distribution.
🔧 Product Details:
Size: 12 inch (DN300)
Pressure Rating: Class 150
Standard: ASME B16.5
Flange Type: Long Weld Neck (LWN)
Material: 316 Stainless Steel
Molybdenum-bearing austenitic steel with superior corrosion resistance to chloride and acidic environments
Neck Extension: Provides added strength and supports welded connections to process piping or vessel nozzles
📐 Typical Dimensions (Approx.):
| Specification | Value |
|---|---|
| Outside Diameter (OD) | 483 mm |
| Bolt Circle Diameter | 438 mm |
| Number of Bolt Holes | 12 |
| Bolt Hole Diameter | 29 mm |
| Flange Thickness | 29 mm |
| Neck Length | Custom or standard (e.g. 150 mm) |
| Raised Face (RF) Height | 2 mm |
Dimensions vary slightly based on application requirements.
⚙️ Key Features:
Designed for high-stress environments such as pressure vessels and heat exchangers
Extended neck ensures smooth flow transition, reducing turbulence and erosion
Excellent resistance to pitting, crevice corrosion, and oxidation
Suitable for welding directly to piping or vessel heads
Compliant with NACE MR0175 for sour service upon request
🌍 Typical Applications:
Chemical processing equipment
High-temperature and high-pressure systems
Offshore platforms and marine environments
Power plants and energy systems
Industrial boilers and storage tanks
🏆 SSM Advantages:
Experienced manufacturer of ASME standard flanges in stainless steel and specialty alloys
Precision machining for perfect neck alignment and welding surface
Available in custom lengths and bore sizes
Fast delivery with global logistics support
Accompanied by full material traceability certificates (EN 10204 3.1 / 3.2)
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