Product Specification

S32750 2507 Super Duplex Steel Seamless Tube for Marine

Product Name: Super Duplex Seamless Tube
Material: Super Duplex S32750 / 2507
Standard: ASTM A789 / ASME SA789
Process: Seamless, Cold Drawn, Solution Annealed & Quenched
PREN: > 40
Application: Subsea, Marine, Desalination, Oil & Gas
Size: Wide range of OD and WT available

Material Properties: Super Duplex S32750
Super Duplex steel S32750 is designed for extreme performance in extremely corrosive environments. Its high chromium, molybdenum, and nitrogen chemical composition results in a Pitting Resistance Equivalent Number (PREN) exceeding 40, giving it unparalleled resistance to localized corrosion. In high-chloride environments such as warm seawater, S32750 is virtually immune to stress corrosion cracking (SCC). Its comprehensive corrosion resistance far exceeds that of standard duplex steels and most austenitic stainless steels, making it the solution for the ultimate corrosion challenges.

Chemical & Mechanical Properties of S32750
Chemical Composition (wt %), ASTM A789:
Chromium (Cr): 24.0 - 26.0
Nickel (Ni): 6.0 - 8.0
Molybdenum (Mo): 3.0 - 5.0
Nitrogen (N): 0.24 - 0.32
Manganese (Mn): 1.20 max
Copper (Cu): 0.50 max
Mechanical Properties (Minimum), ASTM A789:
Tensile Strength: 800 MPa (116 ksi)
Yield Strength: 550 MPa (80 ksi)
Elongation: 15%
Hardness: 310 HBW / 32 HRC max

Application in Marine Engineering
S32750 Seamless Tube is specified for the most demanding marine applications. It is a core material for control lines, hydraulic pipes, and process piping in subsea oil and gas production systems, exposed to high-pressure and corrosive well fluids. In the seawater desalination (SWRO) sector, it is used in the high-pressure end of reverse osmosis, which withstands extreme pressures. Furthermore, in offshore chemical plants, it is a key choice for handling highly corrosive media, ensuring the long-term, safe operation of equipment.

Quality Control System
The superior performance of super duplex steel is highly dependent on its microstructure. Therefore, in addition to conventional non-destructive testing and dimensional inspection, we implement specialized and stringent quality control measures for S32750 pipe. After solution annealing and quenching heat treatment, we perform metallographic analysis to ensure the austenite/ferrite phase ratio is within the ideal range of 40-60%, ensuring the material possesses the required high strength and superior corrosion resistance.

Global Supply & Export
As a leading stainless steel pipe exporter, SMLSCO has extensive experience supplying high-performance materials to customers worldwide. We are well-versed in international logistics, standard differences, and export documentation requirements, providing a smooth and worry-free procurement process. Our professional team and strong and reliable export packaging ensure that high-value products like super duplex steel can be delivered safely and on time to your warehouses around the world.