Duplex 2205 Polished Stainless Steel Seamless Tube ASTM A789 For Offshore

Product Specification

Advantages of SMLSCO
SMLSCO is your trusted supplier of piping systems. With more than 3,000 tons of stainless steel in stock, we ensure fast delivery of regular-sized products, as fast as two weeks. Our products have international certifications such as ISO and PED, and their quality is stable and reliable. With nearly 19 years of industry experience, we integrate cost advantages from raw materials to production, and are committed to providing excellent value with fast delivery and cost-effectiveness to global distributor partners.

Product Parameters
Product Name: Duplex 2205 Seamless Tube
Material: Duplex 2205 / UNS S32205
Standard: ASTM A789 / ASME SA789
Process: Seamless, Polished,
Application: Offshore & Marine, Chemical Processing, Desalination
Size: Wide range of OD and WT available
Stock Status: Common sizes ready to ship

Introduction to Duplex Steel Advantages
Duplex stainless steel is unique in that its metallographic structure is composed of approximately 50% austenite and 50% ferrite. This duplex structure gives it the advantages of both types of stainless steel: it has the good toughness and weldability of austenitic stainless steel, and the high strength and excellent resistance to stress corrosion cracking (SCC) of ferritic stainless steel. This "best of both worlds" feature makes it an excellent material choice for harsh corrosive environments.

Chemical & Mechanical Properties of 2205

Chemical Composition (wt %), ASTM A789:
Chromium (Cr): 22.0 - 23.0
Nickel (Ni): 4.5 - 6.5
Molybdenum (Mo): 3.0 - 3.5
Nitrogen (N): 0.14 - 0.20
Manganese (Mn): 2.00 max
Silicon (Si): 1.00 max
Mechanical Properties (Minimum), ASTM A789:
Tensile Strength: 620 MPa (90 ksi)
Yield Strength: 450 MPa (65 ksi)
Elongation: 25%
Hardness: 293 HBW / 31 HRC max

Application in Offshore Platforms
In harsh offshore environments, 2205 duplex seamless steel pipes are at the heart of critical systems exposed to corrosive seawater and process fluids. They are widely used in seawater cooling systems, process piping, fire water systems, and structural parts. Its high strength allows for thinner walls, significantly reducing platform weight, a key design advantage. Its superior corrosion resistance ensures long service life in salt spray and high chloride environments.

Quality Control System
For demanding applications such as offshore platforms, our quality control is uncompromising. 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 our products fully comply with ASTM A789 standards, providing reliable products with complete quality records for critical applications.