Stainless Steel Flanges for Marine Applications are corrosion-resistant components tailored for harsh saltwater environments. Fabricated from ASTM A182 F316L stainless steel (Cr 16-18%, Ni 10-14%, Mo 2-3%), they contain molybdenum that enhances pitting resistance (PREN ≥ 40) in chloride-rich environments.
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Product Description
Certified by DNV and ABS, these flanges meet ASME B16.5 dimensional standards, making them essential for shipbuilding, offshore energy, and coastal infrastructure.
Product | Stainless steel Flange |
Technical | Forged |
Types of Flange | Slip On Flange |
Welded Neck Flange | |
Blind Flange | |
Thread Flange | |
Plate Flange | |
Lap joint flange | |
Grade | 304,316L,321,317L,304H,310s,347H,316Ti,904L,253MA,254SMO |
Duplex Steel: | |
UNS S31803,S32205,S32750,S32760 | |
Nickel Alloy: | |
N04400, N08800,N08810, N08811,N08825, N08020,N08031, N06600,N06625, N08926,N08031, N10276 | |
Dimension | DN15-DN3000,1/2''-36'' |
Pressure Rating | Class150-Class2500 PN10-PN160 |
Standard | ASME B16.5,ASME B16.47 |
MSS SP44 | |
EN1092-1 | |
ASTM A182 | |
JIS B2220, | |
BS4504 | |
SABS/SANS 1123 | |
AWWA C207 | |
Advantages | Regular stock , fast delivery , high quality ,Available in a wide range of sizes |
Application | Industry Decoration Sanitary Structural |
Packaging | Plastic bag/woven packing(please send details packing to us if you have other requirements) |
Intergranular Corrosion Resistance: Low carbon content (≤0.035%) prevents sensitization during welding, maintaining corrosion resistance in heat-affected zones.
Surface Finish: 2B or No.4 polished surfaces reduce biofouling accumulation, with Ra ≤ 0.8μm to minimize marine organism adhesion.
Hydrostatic Testing: Each flange undergoes 1.5x design pressure testing for 30 minutes, ensuring leak tightness in submerged applications.
Fastener Compatibility: Pre-drilled holes match ASTM A193 B8M bolts, creating a complete corrosion-resistant system.
Shipboard Systems: Used in seawater cooling lines, ballast water treatment systems, and fuel transfer manifolds.
Offshore Platforms: Connects risers, umbilicals, and process pipelines in oil and gas production facilities.
Coastal Desalination: Applied in reverse osmosis unit piping, brine discharge lines, and intake structures.
Q: What is the expected service life in fully submerged seawater?
A: Typically 20-30 years with proper maintenance, depending on water velocity and chlorination levels.
Q: Can they be used with sulfur-containing media?
A: Yes, 316L's molybdenum content provides better resistance to sulfide stress cracking than 304 stainless steel.
Q: What welding process is recommended?
A: GTAW (TIG) with ER316L filler metal, using argon backing gas to prevent oxidation of root passes.
