TOBO STEEL GROUP CHINA
| Manufacturing | Forged |
| Application | Large Bore Pipeline Connection |
| Standard | ASME B16.5 / B16.47 |
| Size Range | 24 inch - 72 inch |
| Face Type | Raised Face (RF) |
| Product Name | Large Diameter Weld Neck Flange |
| Material | Carbon Steel / Stainless Steel / Alloy Steel |
| Pressure Rating | Class 150 - 900 |
| Model Number | WN-LD-24 |
| Brand Name | TOBO |
| Place of Origin | Shanghai, China |
| Certification | ISO 9001:2015, SGS, BV |
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Product Specification
| Manufacturing | Forged | Application | Large Bore Pipeline Connection |
| Standard | ASME B16.5 / B16.47 | Size Range | 24 inch - 72 inch |
| Face Type | Raised Face (RF) | Product Name | Large Diameter Weld Neck Flange |
| Material | Carbon Steel / Stainless Steel / Alloy Steel | Pressure Rating | Class 150 - 900 |
| Model Number | WN-LD-24 | Brand Name | TOBO |
| Place of Origin | Shanghai, China | Certification | ISO 9001:2015, SGS, BV |
| High Light | Large Diameter Flange ，Big Size Weld Neck ，Large Bore Flange | ||
The Large Diameter Weld Neck Flange is engineered for large bore pipeline systems that demand a strong, reliable connection at high flow rates. Produced from forged carbon steel, stainless steel and alloy steel billets, these oversized flanges maintain dimensional accuracy and mechanical integrity even at diameters up to 72 inch, making them ideal for main trunk lines, water transmission and major industrial piping.
Manufactured to ASME B16.5 and ASME B16.47 standards, each large diameter weld neck flange undergoes precision machining to guarantee flatness of the sealing face and concentricity of the bolt circle. The extended weld neck hub provides a gradual transition that supports full penetration butt welding, minimizing stress at the joint and delivering a leak-tight seal under sustained operating pressure.
| Parameter | Specification |
|---|---|
| Product Name | Large Diameter Weld Neck Flange |
| Standard | ASME B16.5, ASME B16.47 |
| Material | Carbon Steel, Stainless Steel, Alloy Steel |
| Pressure Rating | Class 150 - 900 |
| Face Type | Raised Face (RF) |
| Size Range | 24 inch - 72 inch |
| Manufacturing | Forged |
| Application | Large Bore Pipeline Connection |
A: We manufacture large diameter weld neck flanges up to 72 inch. For diameters beyond 48 inch, flanges are typically supplied as custom-forged rings machined to ASME B16.47 Series A or Series B dimensions according to your piping specification.
A: Each large diameter weld neck flange is precision machined on large-bore CNC lathes and verified with a coordinate measuring machine. The raised face is machined with a controlled surface finish to ensure a reliable gasket seal under operating pressure.
A: Yes, we offer custom face drilling and bolt circle patterns to match non-standard mating equipment. Simply provide your drawing or specification, and our engineering team will confirm feasibility and lead time.
Large diameter weld neck flanges are forged from carefully selected billets and machined on large-bore CNC turning centers. After machining, the sealing face flatness and bolt circle concentricity are verified with a coordinate measuring machine to ensure perfect alignment with mating equipment. Each flange is marked with heat number, material grade and pressure class for full traceability from billet to finished product.
A: Large diameter weld neck flanges are packed on reinforced steel pallets with protective edge guards and weather-resistant wrapping to prevent damage during transport. We coordinate with ocean freight and land carriers experienced in oversized cargo to deliver your flanges safely to the project site.
Company Details
Business Type:
Manufacturer,Agent,Importer,Exporter,Trading Company,Seller
Year Established:
1998
Total Annual:
100000-100000000
Employee Number:
200~300
Ecer Certification：
Verified Supplier
TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ... TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ...
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