ASTM A789 Duplex Steel Seamless Tube Polished For Corrosive Media

Product Specification

Advantages of SMLSCO
SMLSCO started with seamless pipes and has 19 years of experience in seamless pipe production. With more than 3,000 tons of stainless steel in stock, we ensure the fast delivery of regular size products, as fast as two weeks. Our products have international certifications such as ISO and PED, and the quality is stable and reliable. In addition, we also provide one-stop procurement, including pipe fittings and flange products. Choose SMLSCO and connect with only one piping system supplier.

Product Parameters
Product Name: Duplex Steel Polished Seamless Tube
Material: Duplex 2205 (UNS S32205), Super Duplex 2507 (UNS S32750)
Standard: ASTM A789 / ASME SA789
Process: Seamless, Cold Drawn, Annealed
Surface Finish: Polished (e.g., 320# OD)
Application: Chemical Processing, Desalination, Oil & Gas
Size: Wide range of OD and WT available
Stock Status: Common sizes in stock

2205 vs. 2507 | Duplex Grade Selection: 2205 vs. 2507
Choosing the right duplex grade is critical. 2205 is the most widely used “workhorse” grade, offering an excellent balance of high strength and corrosion resistance for a wide range of demanding applications. 2507 is a "super duplex steel" with higher chromium, molybdenum and nitrogen content, which makes it stronger and more corrosion-resistant than 2205. Especially in extreme corrosive environments such as high chloride and acid, 2507 is the first choice to ensure the ultimate reliability of the system.

Introduction to Polished Finish
Our seamless pipes can provide a precision polished surface. This is a process that mechanically treats the outer surface of the pipe to obtain a high finish. For pipes that transport corrosive media, a smooth surface is not only beautiful, but more importantly, it can reduce the risk of media adhesion and bacterial growth, and improve the convenience of cleaning the pipe. At the same time, polishing can also enhance the passivation film on the surface of the material to a certain extent, thereby improving its corrosion resistance and ensuring the efficiency and purity of the system.

Application in Corrosive Media
Duplex steel seamless pipes are designed for the transportation of various corrosive media. In the field of chemical processing, they are used to transport acids, alkalis and chloride-containing solutions. In the oil and gas industry, they are used to handle corrosive wet gas and production fluids. In addition, due to its excellent resistance to seawater corrosion, duplex steel pipes are also an indispensable core material in seawater desalination (RO) and marine engineering, ensuring the long-term reliability of equipment in these highly corrosive environments.

Quality Control System
We are well aware of the stringent quality requirements for pipes that transport corrosive media. SMLSCO implements a strict three-step inspection system: from incoming material composition verification, to dimensional and surface control during production, to 100% final inspection of each finished pipe. We implement a series of non-destructive tests including PMI chemical analysis, eddy current or hydrostatic flaw detection to ensure that the products fully comply with ASTM A789 standards and provide reliable products with complete quality records for critical applications.