Haihao Group Delivers ASME B16.5 A350 LF2 Flanges for Low-Temperature Pipeline Project in Russia
Haihao Group has recently completed the production and shipment of a comprehensive batch of ASME B16.5 A350 LF2 flanges for an industrial pipeline project in Russia. The order includes weld neck flanges, socket weld flanges, threaded flanges, blind flanges, reducing flanges, and spectacle blinds covering pressure classes from Class 150 to Class 2500.
Designed for low-temperature service, the flanges were manufactured from ASTM A350 LF2 low-temperature carbon steel, with selected alloy steel ASTM A182 F11 flanges supplied for elevated-temperature applications. Every ASME B16.5 A350 LF2 flange underwent heat treatment and rigorous inspection to ensure excellent toughness, mechanical strength, and reliable performance under demanding operating conditions.
Shipment Overview
The shipment covers a broad range of forged flanges manufactured in accordance with ASME B16.5, ASME B16.47 Series A, and ASME B16.48, allowing the customer to support multiple piping systems within the same project.
| Product | Size | Pressure / Schedule | Material | Standard |
| Blind Flange RF | 1″, 18″ | Class 150 | ASTM A350 LF2 | ASME B16.5 |
| Reducing Flange | 3″ × 2″ | Class 150 | ASTM A350 LF2 | ASME B16.5 |
| Spectacle Blind | 2″ | Class 300 | ASTM A516 Gr.70 | ASME B16.48 |
| Socket Weld Flange RF | 1″, 1-1/2″ | Class 150–1500 / SCH XS & SCH160 | ASTM A350 LF2 / ASTM A182 F11 | ASME B16.5 |
| Threaded Flange RF | 2″ | Class 150 | ASTM A350 LF2 | ASME B16.5 |
| Weld Neck Flange RF | 2″–24″ | Class 150–2500 | ASTM A350 LF2 / ASTM A105 / ASTM A182 F11 | ASME B16.5 |
| Large Diameter WN Flange RF | 26″, 36″ | Class 150 | ASTM A350 LF2 | ASME B16.47 Series A |
The shipment demonstrates Haihao Group’s ability to manufacture ASME B16.5 A350 LF2 flanges in a wide variety of sizes, pressure ratings, and material grades while maintaining strict dimensional accuracy and material consistency.
ASME B16.5 A350 LF2 flanges and A516 GR70 spectacle blind flange manufactured by Haihao Group
Manufactured for Low-Temperature Pipeline Service
For projects operating in cold climates, material toughness is as important as pressure resistance. ASTM A350 LF2 is widely specified because of its excellent impact properties at sub-zero temperatures.
Every ASME B16.5 A350 LF2 flange supplied for this project received qualified heat treatment to achieve the required mechanical properties. After heat treatment, the products successfully satisfied the customer’s low-temperature impact requirements, ensuring dependable performance in oil & gas, LNG terminals, storage facilities, and energy infrastructure.
The shipment also included selected ASTM A182 F11 alloy steel flanges for systems exposed to elevated operating temperatures, providing a complete flange solution for different sections of the pipeline.
Comprehensive Quality Control
Haihao Group follows a complete inspection process from raw material procurement to final packaging. Each production stage is carefully monitored to ensure every flange complies with international standards and customer specifications.
| Inspection Item | Requirement / Result |
| Raw Material Inspection | Certified materials with full traceability |
| Dimensional Inspection | 100% Verified According to ASME Standards |
| Heat Treatment | Completed to Maintain Mechanical Properties |
| Mechanical Properties | Fully Qualified |
| Low-Temperature Impact Test | Passed Customer Requirements |
| Visual & Surface Inspection | Qualified Before Shipment |
| Export Packaging | Protected for Overseas Transportation |
Why Choose Haihao Group for Forged Flanges?
Haihao Group has over 40 years of manufacturing experience in forged flanges, pipe fittings, and steel pipes. We supply complete piping solutions to customers across Europe, Southeast Asia, the Middle East, South America, and Africa.
Our manufacturing advantages include:
- Production according to ASME, EN, DIN, GOST and JIS standards
- Carbon steel, stainless steel, duplex stainless steel, alloy steel and nickel alloy materials
- Pressure ratings from Class 150 to Class 2500
- Sizes from 1/2″ to 60″
- Heat treatment and complete mechanical testing
- Low-temperature impact testing
- PMI, NDT and third-party inspection available
- Export-grade packaging for global transportation
Whether your project requires standard products or custom-engineered flanges, Haihao Group delivers reliable solutions backed by strict quality control.
Request a Quote for ASME B16.5 A350 LF2 Flanges
If you are looking for a dependable manufacturer of ASME B16.5 A350 LF2 flanges, large-diameter weld neck flanges, spectacle blinds, or customized forged flanges, Haihao Group is ready to support your project.
Our engineering team can provide technical recommendations, customized manufacturing, inspection documentation, and fast international delivery for industrial pipeline applications worldwide.
Contact Haihao Group today to discuss your next pipeline project.
FAQ
What materials were supplied in this shipment?
The order mainly included ASTM A350 LF2 low-temperature carbon steel flanges, together with ASTM A182 F11 alloy steel flanges, ASTM A105 forged flanges, and an ASTM A516 Gr.70 spectacle blind.
Which standards were followed?
The flanges were manufactured according to ASME B16.5, ASME B16.47 Series A, and ASME B16.48, depending on the product type.
Were the flanges heat treated?
Yes. All applicable products underwent qualified heat treatment to maintain the required mechanical properties and service performance.
Did the products meet low-temperature service requirements?
Yes. The ASTM A350 LF2 flanges successfully passed the specified low-temperature impact testing, making them suitable for cold-service pipeline applications.
Can Haihao Group manufacture customized forged flanges?
Yes. Haihao Group manufactures forged flanges in carbon steel, stainless steel, duplex stainless steel, alloy steel, and nickel alloys according to ASME, EN, DIN, JIS, GOST, and customer drawings.