Flange cladding with ER309LMo + 316L  is a specialized process used in industries where flanges require enhanced corrosion resistance, high-temperature performance, and mechanical strength. This combination of materials is particularly suited for applications in aggressive environments, such as chemical processing, oil and gas, and power generation.

Forming Process:

FNS utilizes automated precision cladding technologies to apply ER309LMo and 316L stainless steel alloy layers onto the inner bore and sealing surfaces of forged flanges. The process is controlled by advanced welding techniques such as GTAW, PTA, laser cladding, and CMT, ensuring consistency, durability, and optimal metallurgical bonding.

Flange Size Range:

2″– 48″ (custom sizes available upon request)

Base Material for Forged Flanges:

Carbon steel, low alloy steel, stainless steel, pipeline-grade steels, and other customized materials.

Cladding Material:

ER309LMo (buffer layer) + 316L stainless steel (corrosion-resistant layer). This dual-layer cladding structure offers a reliable transition from base metal to corrosion-resistant surface, enhancing the flange’s resistance to pitting, intergranular corrosion, and chloride-induced stress corrosion cracking.

Flange Cladding (ER309LMo + 316L)

Applications:

Widely used in petrochemical plants, offshore and marine environments, oil & gas pipelines, refineries, power generation systems, and district heating networks — especially in applications requiring superior sealing performance under corrosive and high-pressure conditions.

Product Features:

FNS cladded flanges feature:

High-performance corrosion resistance, especially in chloride- and acid-rich environments

Strong metallurgical bonding with low dilution and high adhesion strength

Smooth, uniform sealing surfaces ensuring leak-tight performance

Enhanced mechanical stability under thermal cycling and pressure variation

Reliable dual-layer cladding for extended service life and reduced maintenance

Capacity:

FNS operates with over 100 sets of dedicated flange welding equipment, including horizontal and CCC/ETR systems. Our annual capacity exceeds 500 tons, supporting both standard and custom-engineered flange solutions for global clients.