Why Iron Flanges Remain a Cornerstone in Industrial Piping Systems

In industrial fluid systems, long-term performance often hinges on the quality of the connection components. Among them, iron flanges continue to play a pivotal role in ensuring pressure containment, structural stability, and ease of maintenance. Withstanding harsh operating conditions and variable mechanical loads, today’s iron flanges are engineered to meet modern performance expectations across water supply, steam networks, and non-corrosive fluid and gas applications.

Engineered for High Load and Pressure Environments

Modern iron flanges are cast from gray cast iron (HT250) or ductile iron (QT450-10), offering a strong balance of rigidity, strength, and ductility. With a dynamic load-bearing capacity of 30.7 kN and static support up to 19 kN, they provide dependable structural integrity under variable operating conditions. Their integrally cast body and flange minimize stress concentrations, making them ideal for high-pressure industrial pipelines.

These flanges operate within temperatures ranging from -20°C to 165°C, and support pressures up to 400 psig (2,760 kPa). This makes them compatible with a variety of media, including water, steam, oil, and non-corrosive gases. Whether used in a municipal water line, HVAC steam circuit, or a gas-powered process unit, the flanges deliver reliable sealing and joint stability.

Sealing Technology That Surpasses Industry Standards

A key performance differentiator is the flange’s metal/rubber composite sealing surface, which delivers strong, long-lasting seals even under repeated pressure cycles. Each flange undergoes rigorous GB/T 13927 pressure testing, and its leakage rate falls below international benchmarks, ensuring secure and reliable operation in demanding systems.

Optional non-asbestos gaskets are available to support environmentally regulated projects, offering heat resistance and compliance without compromising sealing performance. This makes the product well-suited for applications in petrochemical, water treatment, and heating systems.

Streamlined Installation and Long-Term Maintainability

Installation and field service efficiency are built into the design. The standardized bolt hole configuration aligns with both PN1–PN25 and ASME B16.5 150–2500 Lbs standards, simplifying integration into new or existing pipelines. The pre-set lubrication port adds a valuable layer of maintenance ease by minimizing friction loss and extending component life—an important consideration in high-wear environments.

Whether supporting DN50 to DN2000 pipe diameters or accommodating NPS 2" to 80" inch conversions, these iron flanges offer broad compatibility for international project specifications.

Fully Compliant and Industry-Tested

To guarantee performance and structural soundness, each flange undergoes 100% magnetic particle testing (MT) and penetrant testing (PT). All products are manufactured in accordance with SH/T 3406-2022 petrochemical industry standards, ensuring that quality and compliance extend from the foundry floor to field application.

For engineers and procurement professionals managing industrial pipeline systems, choosing the right flange is a matter of both technical suitability and long-term value. These iron flanges offer a trusted, standards-aligned solution that prioritizes performance, compliance, and operational flexibility.