DUPLEX STEEL FLANGES A182 F53 UNS S32750 2507 1.4410 B16.5 WNRF FLANGE FOR PIPELINE SYSTEMS

DUPLEX STEEL FLANGES A182 F53 UNS S32750 2507 1.4410 B16.5 WNRF FLANGE FOR PIPELINE SYSTEMS

F53 is the forging grade under ASTM A182 for Super Duplex Stainless Steel UNS S32750, widely called 2507 super duplex,also known as SAF 2507 / 1.4410.Its microstructure is roughly 50% ferrite + 50% austenite. Typical composition: ~25% Cr, ~7% Ni, ~4% Mo, ~0.28% N, PREN ≥40.

1.Outstanding chloride corrosion resistance Excellent resistance to pitting, crevice corrosion and chloride stress corrosion cracking (SCC). It works well in raw seawater, brine and chloride-containing process media, much better than 2205 duplex and 316L.
2.High mechanical strength Min yield strength ≥550 MPa, around 2 times of 316L and higher than 2205. It allows thinner wall design for high-pressure piping, saving weight for offshore packages.
3.Good erosion-corrosion & corrosion-fatigue resistance Suitable for fluid with solid particles, high flow velocity service.
4.Good weldability No post-weld heat treatment required normally.
5.NACE MR0175 / ISO 15156 qualified Can be used for sour oil & gas service with H₂S, within the approved limits.
Limitation: Long-term continuous service temperature generally ≤ 280°C; avoid prolonged heating at 300–550°C (risk of sigma phase embrittlement).

Typical Usage

Offshore oil & gas: seawater lift / injection, firewater ring, FPSO topside, subsea manifolds, produced water piping
SWRO seawater desalination: high-pressure brine reject lines
FGD flue gas scrubber, flue gas desulfurization systems
Pulp & paper: chlorine dioxide bleaching circuits
Chemical plants: hot chloride, dilute acid, brine process lines
Marine cooling, geothermal, high chloride heat exchanger piping

Chemical Component

Main material