UP TO DN4000
Stainless steel flanges up to 4 meters in diameter. One of the few manufacturers capable of this size range.
QUOTE IN 24 HOURS
From drawing review to pricing. Standard and custom orders, MOQ from 1 piece.
100% IN-HOUSE
Forging, machining, and inspection under one roof. Full traceability from billet to shipment.
STAINLESS STEEL FLANGE

MOST POPULAR FLANGES

Longan Flange provides various types of standard and custom stainless steel flanges in all sizes and standards.
Inside Our Stainless Steel Flange Factory

See how we forge, machine, and inspect flanges up to DN4000 — from raw billet to finished product, all in-house.

About Us

Precision Forged, Extra-Large

We specialize in manufacturing industrial flanges up to 4 meters in diameter, meeting the demands of heavy-duty applications in oil & gas, petrochemical, power generation, and large infrastructure projects.

All flanges are forged, machined, and inspected in-house at our Wenzhou facility, ensuring dimensional precision, structural integrity, and full international standard compliance. We hold ISO 9001, ISO 14001, ISO 45001, CE, and PED certifications, with quality processes including NDT, hardness testing, and complete material traceability. MOQ starts from 1 piece, with quotes delivered within 24 hours.
2011
Founded
in the Year
160
High Precision
Machining Centers
150
Test Equipment
60
Patents
Stainless Steel Flange Material Testing
Stainless Steel Flange Material Testing
In making stainless steel flanges, the raw materials are first tested with spectral detection. This process checks for impurities and ensures the materials are of good quality. It helps make sure the stainless steel flanges are strong and meet industry standards.
Stainless Steel Flange Crafting
Stainless Steel Flange Crafting
The process begins with precision cutting that raw materials are cut into appropriate sizes. Then, they undergo forging to achieve the desired shape and strength. Next, rolling refines the shape further. Finally, CNC machines finish the Stainless Steel flanges.
Stainless Steel Flange Processing
Stainless Steel Flange Processing
It involves using machining centers for shaping and high-speed drilling machines for creating holes. Machining centers handle cuts and shaping, while high-speed drilling machines ensure hole placement.
Stainless Steel Flange Quality Check
Stainless Steel Flange Quality Check
To insure the quality of Stainless Steel flanges, we begin with spectral detection to analyze the material composition. After that, we conduct thorough inspection tests to verify the accuracy and durability.
Logistic Chain
Logistic Chain
Once the Stainless Steel flanges are finished, they are stored in a warehouse. Then, they are packed for shipment. Logistics professionals handle their transportation, ensuring delivery to the intended use unit. Upon arrival, the Stainless Steel flanges are ready for installation and operation.

PIPELINE CONNECTION

The main role of Stainless Steel flanges is to connect pipes and various equipment, making them a unified system. Stainless Steel Flanges enable the transfer of fluids, gases, and solids, meeting the needs of production, manufacturing, and supply across various industrial sectors.

PIPELINE JUNCTION

Stainless Steel Flanges can be used to connect pipes of varying sizes and materials. Since different equipment and pipes may have specific size and material requirements, using Stainless Steel flanges helps connect them, ensuring fluid transfer between different pipelines.

VALVE & PUMP LINK

Stainless Steel Flanges are widely utilized for connecting valves and pumps. Valves and pumps are integrated into these pipeline systems, and using Stainless Steel flanges helps their installation and maintenance, thereby ensuring fluid control and transport throughout the system.

DISASSEMBLY & CARE

Using Stainless Steel flanges allows for disassembly and maintenance of equipment and piping systems. When maintenance, replacement, or repairs are needed, loosening the Stainless Steel flange bolts can separate the equipment from the piping. It minimizes disruption to the entire system.

CONTACT US
Looking for fast pricing or a custom flange solution? Tell us what you need.
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+86-15727821389
+86-15355931307
Request A Quote
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