Haihao Group just finished an order of ГОСТ 33259 12Х18Н10Т/AISI321 RF weld neck flanges for a Latvian client. The flanges are made to the ГОСТ 33259 standard and use 12Х18Н10Т/AISI321 material. They come in sizes from DN200 to DN400 and have a PN16 pressure rating. The 321 grade material has th ...

Flanged connections are essential in piping systems that require secure, detachable joints. They allow for easier maintenance, inspection, and replacement of components. However, not all flanges are the same. In this article, we’ll explain the most common flange face types: Flat Face (FF), Raise ...

Haihao Group has successfully completed an order of Nickel Alloy ASTM B564 UNS N06625 ASME B16.5 NACE MR-01-75 RF Weld Neck Flanges for a Singapore client. These flanges, sized at 2″ SCH 40S 300#, exemplify our commitment to delivering high-quality products that meet stringent internationa ...

Haihao Group recently fulfilled an order for Type 01 EN1092-1 Q235 slip-on flanges for a client in Malaysia. Product Specifications Material: Q235 carbon steel, known for its excellent mechanical properties and weldability. Standard: EN1092-1, ensuring precise dimensions and compatibility with ...

April 15, 2025, Moscow – Day 2 of Russia’s premier oil and gas exhibition, NEFTEGAZ 2025, continues to electrify the Expocentre Moscow. Haihao Group, a global leader in industrial pipe fittings, flanges, and integrated pipeline solutions, is making waves alongside strategic partners Ganyea ...

At Haihao Group, we are dedicated to delivering high-quality pipe fittings and solutions that meet the most demanding industrial standards. Our recent focus on the DIN 2576 SS 316L FF SO Flange has allowed us to provide exceptional products tailored to meet the specific needs of our Singapore cl ...

As the global energy sector continues to evolve with new challenges and innovations, NEFTEGAZ 2025 is set to once again take center stage as Russia’s premier oil and gas industry exhibition. Taking place from April 14 to April 17, 2025, at the Expocentre Fairgrounds in Moscow, this flagshi ...

In the industrial piping sector, off-the-shelf products don’t always meet every project’s specific requirements. That’s why custom manufacturing is essential—especially when working with complex systems or international standards. Recently, Haihao Group produced a batch of custom pip ...

ASTM A350 LF2 Class 1 (CL1) is a commonly used carbon steel material for forged flanges, fittings, and piping components in low-temperature applications. To ensure its performance and durability in extreme conditions, rigorous quality testing is required. One of the most critical tests for A350 ...

In the ever-evolving industrial sector, large-diameter flanges play a crucial role in ensuring the integrity and efficiency of pipeline systems. This article will introduce a meticulously crafted large-diameter flange, designed and manufactured to meet stringent industry standards. Large diamete ...

Flanges play a crucial role in pipeline systems, providing secure connections between pipes, valves, and equipment. Among various flange standards, ASME B16.47 is designed specifically for large-diameter flanges (≥26 inches), making it a preferred choice in industries like oil & gas, petroch ...

What is a Spectacle Blind Flange? A spectacle blind flange is a piping component used to isolate sections of a pipeline or to temporarily shut off the flow for maintenance and safety purposes. It consists of two metal discs connected by a small bridge—one disc is solid (blind), blocking flow, wh ...