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Dawei Steel Co., Ltd.

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Slip-On/Weld Neck/Blind Flanges – Non-Standard Parts Customized to Drawings, Fast Delivery

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Product Descrio

A flanged pipe (also known as a flanged pipe fitting or flanged pipe section) refers to a pipe component where a flange is attached to the end of a steel pipe through welding, forging, or integral forming, with a sealed connection achieved using bolts and gaskets. This structure features high connection strength, reliable sealing performance, and easy assembly and disassembly, making it suitable for various industrial piping systems.


Core Value: Every Process, Dedicated to Achieving Reliable Connections

Flanges, as critical connecting components in piping systems, have machining precision that directly determines the sealing performance and safety of the entire pipeline. We offer one-stop flange machining services from raw material procurement, forging, machining, surface finishing to non-destructive testing. Whether for standard parts or non-standard customizations, we leverage exquisite craftsmanship and strict quality control to create perfectly matching flange products for you.

We provide more than just flanges; we offer the most reliable connection points for your piping systems.


Why Choose Our Flange Machining Services?

1、Full-Process Customization Capability

Support for machining to drawings, customization to samples, or joint design. Whether you require carbon steel, alloy steel, or stainless steel, we provide the most suitable material selection recommendations based on your operating conditions.

2、Stringent Tolerance Control

Utilizing precision equipment like CNC lathes, machining centers, and drilling machines, we ensure the roughness and flatness of flange sealing faces (FF/RF/RJ/TG/MF) meet or exceed standard requirements. Critical dimensional tolerances can be controlled within ±0.05mm.

3、Comprehensive Flange Type Coverage

Capable of machining various types including Slip-On (SO) , Weld Neck (WN) , Blind (BL) , Threaded (TH) , and Lap Joint (LJ) flanges to meet different connection requirements.

4、Comprehensive Surface Finishing and Inspection

Offering various surface treatments including rust-proof oil coating, galvanizing, Dacromet coating, and Teflon spraying. Supported by inspection services such as ultrasonic testing, magnetic particle inspection, and PMI analysis to ensure every flange meets quality standards before shipment.

5、Quick Response and Delivery

Regular stock of flange blanks in various materials, combined with efficient production scheduling. Small batch customizations can be delivered in as fast as 3 days, with expedited production available for urgent projects.


Machinable Flange Types

  Type

  Description

  Typical Applications

  Slip-On Flange

  SO

  Low-pressure pipelines, ambient temperature media, easy to weld

  Weld Neck Flange

  WN

  High-pressure, high-temperature, severe operating conditions pipelines, uniform stress distribution

  Blind Flange

  BL

  Pipeline end sealing, reserved interfaces

  Socket Weld Flange

  SW

  Small diameter high-pressure pipelines, high welding strength

  Threaded Flange

  TH

  Situations where welding is not permitted, easy installation and removal

  Lap Joint Flange

  LJ

  Lined pipes, non-ferrous metal pipes, convenient for bolt hole alignment



Machining Capabilities & Technical Parameters

  Item

  Details

  Machinable Materials

  Carbon Steel: 20#, A105, Q235; Alloy Steel: F11, F22, 30CrMo, 35CrMo; Stainless Steel: 304/L, 316/L, 310S, 347H, 2205 Duplex; Low-Temp Steel: LF2

  Standards

  GB: GB/T 9112-9124; ASME: ASME B16.5/B16.47, MSS SP-44; JIS: JIS B2220; DIN: DIN 2573/2576

  Pressure Ratings

  ASME: Class 150, 300, 600, 900, 1500, 2500; GB: PN6, PN10, PN16, PN25, PN40, PN63, PN100

  Sealing Face Types

  Raised Face (RF), Flat Face (FF), Ring Joint (RJ), Male & Female (MF), Tongue & Groove (TG)

  Machining Accuracy

  Dimensional Tolerance: ±0.05mm; Roughness: Ra ≤1.6μm (standard), Ra ≤0.4μm (mirror polish)

  Surface Finishing

  Rust-proof oil, black paint, galvanizing, Teflon coating, Dacromet


Why Choose Us?

Integrated Advantage from Forging to Machining: Own forging workshop and machining workshop, reducing intermediate links, offering lower costs and controllable delivery times.

Comprehensive Inspection System: Equipped with PMI analyzers, hardness testers, and ultrasonic flaw detectors. Can provide material certificates and third-party inspection reports.

Rich Export Experience: Products exported to Europe, America, Middle East, and Southeast Asia. Familiar with international standards, packaging meets export requirements.


Conclusion: Flanges may be small, but their responsibility is immense. Let our precision machining services provide the most reliable connection guarantee for your piping systems. Contact us today, upload your drawings, and get a quick quote!


Note: When selecting flanges, please ensure to confirm the following parameters: Nominal Diameter (DN) , Nominal Pressure (PN/Class) , Flange Type, Sealing Face Type, and the Outer Diameter and Wall Thickness of the connecting pipe. Our engineering team can provide professional selection recommendations.







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