ASTM B564 UNS N06625 and F53 Flanges Successfully Delivered to Singapore Project
Haihao Group has successfully completed another shipment of high-performance alloy flanges for a long-term customer in Singapore. This order combines ASTM B564 UNS N06625 flanges and SA/ASTM A182 F53 RTJ flanges, manufactured in accordance with ASME B16.5 requirements for demanding offshore, petrochemical, and corrosive process applications.
The project required multiple flange types with different pressure ratings, while also specifying stringent material verification and inspection requirements. Every product was manufactured, heat treated, inspected, and documented before shipment to ensure reliable performance in severe service environments.
Shipment Overview
| Product | Size | Pressure Class | Material | Standard |
| Blind Flange RF | 3″ | Class 600 | ASTM B564 UNS N06625 | ASME B16.5 |
| Blind Flange RF | 1-1/2″ | Class 600 | ASTM B564 UNS N06625 | ASME B16.5 |
| Weld Neck Flange RTJ | 1″ | Class 2500 | SA/ASTM A182 F53 | ASME B16.5 |
| Blind Flange RTJ | 1″ | Class 2500 | SA/ASTM A182 F53 | ASME B16.5 |
ASTM B564 UNS N06625 Flanges for Severe Corrosion Resistance
The ASTM B564 UNS N06625 flange products supplied in this shipment were manufactured for applications exposed to aggressive chemical media, seawater, and elevated temperatures. Nickel-based Alloy 625 is widely selected because of its outstanding resistance to pitting, crevice corrosion, oxidation, and stress corrosion cracking.
The shipment included Class 600 blind flanges that provide secure pipeline isolation while maintaining long service life in corrosive environments. Every ASTM B564 UNS N06625 flange was machined to ASME B16.5 dimensional tolerances to ensure excellent sealing performance and interchangeability.
ASTM B564 UNS N06625 blind flange and SA ASTM A182 F53 RTJ weld neck flange manufactured by Haihao Group
High-Pressure SA/ASTM A182 F53 RTJ Flanges
Another important part of the order consisted of SA/ASTM A182 F53 flange products designed for high-pressure service.
The shipment included:
- 1″ Class 2500 Weld Neck RTJ Flange
- 1″ Class 2500 Blind RTJ Flange
The SA/ASTM A182 F53 flange is manufactured from Super Duplex stainless steel, offering an excellent balance of mechanical strength and corrosion resistance. Combined with the Ring Type Joint (RTJ) sealing surface, these flanges are suitable for high-pressure oil & gas systems, offshore platforms, and subsea piping.
Throughout production, each SA/ASTM A182 F53 flange received controlled heat treatment to achieve the specified metallurgical structure and mechanical properties.
Comprehensive Inspection and Material Verification
To satisfy the customer’s engineering specifications, Haihao Group completed comprehensive inspection procedures before shipment.
| Inspection Item | Requirement |
| Heat Treatment Report | Provided for all F53 products |
| Mechanical Properties Report | Fully documented |
| Ferrite Content | 40%–60% (F53 requirement) |
| Dimensional Inspection | 100% Verified |
| Visual Inspection | Surface finish confirmed before packing |
The ferrite content of every SA/ASTM A182 F53 flange was carefully controlled within the specified 40–60% range to ensure optimum corrosion resistance, toughness, and long-term reliability.
Reliable Packaging for International Transportation
Before dispatch, all flange sealing surfaces were cleaned and protected to prevent handling damage during international transportation. The products were securely packed for ocean shipment, ensuring they arrived in Singapore ready for installation.
Haihao Group Supports Critical Pipeline Projects Worldwide
Whether the project requires ASTM B564 UNS N06625 flange products for highly corrosive environments or SA/ASTM A182 F53 flange solutions for high-pressure applications, Haihao Group provides complete manufacturing, inspection, documentation, and export services.
With decades of experience supplying pipeline components to customers worldwide, Haihao Group continues to deliver reliable products that comply with international standards while meeting demanding project specifications.
If your upcoming project requires nickel alloy flanges, Super Duplex flanges, or other special alloy piping components, our engineering team is ready to provide technical support, competitive quotations, and fast delivery.