ASME B16.5 F2205 Stainless Steel Forged Flange Class 600 For Offshore Platform

Advantages of Forging Process
Forging is a process in which a metal billet is heated and subjected to pressure through forging equipment to undergo plastic deformation in order to obtain the desired shape and properties. Compared with casting or sheet cutting, forging can eliminate the looseness and porosity inside the metal, refine the grain size, and distribute the metal streamline along the flange shape, thereby obtaining a uniform and dense internal structure. Therefore, forged flanges have the most superior mechanical properties and fatigue strength, making them the preferred manufacturing method for ensuring safety and reliability in high-pressure and critical application scenarios such as offshore platforms.

F2205 Forged Flange in Offshore Platforms
On offshore oil and gas platforms, 2205 forged flanges are key components for dealing with high-pressure and highly corrosive environments. The Class 600 pressure rating makes it suitable for various medium and high pressure pipelines on platforms, such as seawater lifting and cooling systems, fire water main pipes, sulfide containing oil and gas processing pipelines, and subsea pipeline connections. Its high strength and excellent resistance to seawater corrosion can ensure the long-term, maintenance free and safe operation of these critical systems in harsh marine environments, ensuring the production operations of the platform.

Material Properties of Duplex 2205
The core advantage of 2205 duplex steel lies in the perfect combination of high strength and excellent corrosion resistance. Its yield strength is about twice that of 316L austenitic stainless steel, allowing for the use of thinner wall thicknesses in design to reduce platform weight. At the same time, it has strong resistance to pitting and crevice corrosion in seawater environments rich in chloride ions due to its high chromium, molybdenum, and nitrogen content (PREN ≥ 35). Especially important, it can effectively resist chloride stress corrosion cracking (SCC), significantly improving its service life and safety in warm seawater environments.
2205 Chemical&Mechanical Properties of 2205

Chemical Composition (wt %), ASTM A182:
Carbon (C): 0.03 max
Manganese (Mn): 2.00 max
Silicon (Si): 1.00 max
Chromium (Cr): 22.0 - 23.0
Nickel (Ni): 4.5 - 6.5
Molybdenum (Mo): 3.0 - 3.5
Nitrogen (N): 0.14 - 0.20
Mechanical Properties (Minimum), ASTM A182:
Tensile Strength: 620 MPa (90 ksi)
Yield Strength: 450 MPa (65 ksi)
Elongation: 25%
Hardness: 293 HBW max

ASME B16.5 Pressure Classes
ASME B16.5 is the most widely used pipe flange standard worldwide, defining a complete pressure temperature rating system, known as the "Class" series. This series is divided into six levels: Class 150, 300, 600, 900, 1500, and 2500. The larger the number, the higher the pressure that the flange can withstand at the corresponding temperature. Class 600 belongs to the medium to high voltage category, designed specifically for harsh working conditions in industries such as petroleum, chemical, and power generation. It is a commonly used choice for high demand applications such as offshore platforms.