Products

Long Weld Neck Flanges have significantly improved corrosion resistance in chloride environments through ≥2.1% molybdenum content, comply with ASME B16.5 standards, and cover pressures from Class 150 to 2500. Compared with 304 flanges, the salt spray test has been verified for 1,000 hours, and the service life can be increased by 300%, reducing leakage risks and maintenance costs. Suitable for harsh scenarios such as seawater desalination, chemical industry, and pharmaceuticals, ASTM A182 material certification (MTR) and third-party certification (NACE/PED) can be provided

High-quality 316 Neck Butt Welding Flanges can provide superior corrosion resistance in chloride environments. Longan produces a full range of 316 flanges with pressure ratings from 150 to 2500 and sizes from 1/2 inch to 24 inches. We are MTR certified, have sufficient supply and fast delivery. Click here to request a quote now!

You can rest assured to buy High Pressure Flange from our factory. Longan provides engineering-grade flange solutions to solve high-pressure seal failures, covering stainless steel/carbon steel/alloy steel, etc., meeting DINA, SME, API, standards, and providing pressure calculator + 72h emergency replacement service, as well as free system diagnosis services. Come and contact us.

Longan Flange is a Steel High Pressure Flange manufacturer with ISO 9001 certification, providing customized PN100~PN800 pressure levels, ASTM A105/A182 F316L materials, 30-year corrosion resistance guarantee, and 72-hour global delivery. Free technical consultation and other services to help you solve better sealing services.

The core of Carbon Steel High Pressure Flange is as follows: Life cycle: 25 years + (corrosion rate <0.1mm/year, C3 grade anti-corrosion environment), required pressure limit, up to PN100 (10MPa) The maximum burst pressure can be ≥85MPa (third-party SGS actual measurement), sealing leakage rate: <10⁻⁶ mbar·L/s (ISO 5208 A grade standard) Temperature adaptability: -29℃~425℃ (low temperature impact toughness ≥27J)

Flat Welding Raised Face Flanges are widely used in oil and gas transportation, pharmaceutical clean systems, and power station valve groups. The flanges produced by Longan are known for their reputation of "1 flange = 3 certifications". Material traceability, pressure integrity, and product digital management are our advantages. You can feel free to contact us!