Haihao Group Supplies EN 1092-1 Type 11 Duplex Flanges and Seamless Tube to Poland
This month, Haihao Group successfully completed the supply of a batch of high-pressure flanges and seamless tubing for a valued customer in Poland. The order includes EN 1092-1 Type 11 weld neck flanges (Types E and F facing) and a Duplex stainless steel seamless tube, all manufactured from 1.4462 (UNS S31803) material. These components are engineered for PN250 pressure systems, where both mechanical performance and corrosion resistance are critical.
Duplex 1.4462 EN1092 1 Type 11 Weld Neck Flange Manufactured By Haihao Group
Precision-Engineered Components for Demanding Applications
The flange sets were supplied in two configurations:
- Flange type F with neck type 11, DN150, PN250
- Flange type E with neck type 11, DN150, PN250
- Facing type: EN 1092-1 F face and E face
- Material: Duplex stainless steel 1.4462 (UNS S31803)
- Matching pipe: Ø168.3 mm x 11 mm wall thickness
To ensure full compatibility, Haihao also supplied a matching Duplex seamless tube, 295 mm in length, machined and dimensionally aligned with the flange neck and weld preparation angles.
Why Choose Duplex 1.4462 for High-Pressure Applications?
Duplex stainless steel 1.4462 (UNS S31803) combines the best of both austenitic and ferritic steel structures. It offers:
- High strength – nearly double that of 316L
- Excellent resistance to stress corrosion cracking, particularly in chloride-rich environments
- Superior pitting and crevice corrosion resistance (PREN >34)
- Cost-effective performance due to reduced wall thickness requirements
This makes it ideal for pressure vessels, desalination plants, offshore structures, and chemical processing systems where both structural load and corrosion are concerns.
Dimension Inspection of Duplex 1.4462 Seamless Tubes
Manufacturing Standards & Compliance
All flanges were produced strictly in accordance with EN 1092-1 Type 11 and machined to PN250 pressure class. Every detail, including:
- Weld bevel angle
- Raised face (RF) height
- Flange thickness and hub profile
- Bolt circle diameter
was confirmed using calibrated tools and verified against client specifications and the relevant European norms.
The matching seamless pipe (Ø168.3 mm × 11 mm) was sourced from duplex-certified raw material, cut and inspected according to the mechanical joining and welding requirements of the application.
Quality Control, Documentation & Certifications
Haihao provided a full documentation package with this order, including:
- Mill Test Certificates (EN 10204 3.1) for each item
- Marking compliance (heat number, material grade, size, pressure class)
- Dimensional inspection reports
- Visual inspection logs
- PMI (Positive Material Identification) upon request
- Material traceability for every component
As Duplex stainless steels are sensitive to heat input and metallurgical balance, Haihao also reviewed ferrite content and ensured controlled heat treatment history of the raw material before final machining.
Packaging, Marking & Export Logistics
To protect the surface integrity and markings during transit to Poland, each flange and tube segment was:
- Coated with anti-corrosion oil
- Fitted with flange face protectors
- Labeled with customer PO, item code, and heat number
- Packed in fumigated wooden crates with steel banding and inventory manifest
The shipment met all EU customs and documentation requirements, including CE-compliant markings and material declaration forms where applicable.
Supporting European Projects with Duplex-Grade Excellence
This delivery highlights Haihao Group’s ability to supply high-spec, non-standard alloy piping components for critical applications in Europe. With decades of experience serving EPCs, integrators, and distributors across the region, we offer:
- Custom production of EN/DIN/ASME flanges in Duplex and Super Duplex
- Short lead times for forged and machined components
- Full in-house inspection and export documentation support
- Collaboration with third-party agencies (TÜV, BV, SGS) when required
Looking for Certified Duplex Flanges or Tubes?
If your project requires corrosion-resistant, high-pressure rated flanges or pipe spools made from Duplex 1.4462 (S31803) or other special alloys, Haihao is ready to deliver — quickly, precisely, and fully certified.
📩 Contact us today at sales@haihaopipe.com