ASTM A790 S32205 Seamless Pipe DN50 SCH10S 1030mm – Pickled Annealed, 100% Heat Treated

Introduction

The ASTM A790 S32205 Seamless Pipe is a duplex stainless steel product engineered for industries that demand both mechanical strength and exceptional corrosion resistance. Duplex S32205 contains a balanced microstructure of austenite and ferrite, giving it nearly twice the yield strength of 316L stainless steel while maintaining excellent toughness and weldability.

DLSS supplies DN50 SCH10S seamless pipes with a length of 1030 mm, manufactured to ASTM A790 specifications. Each pipe undergoes pickling, annealing, and 100% heat treatment, ensuring reliable performance in marine, offshore, oil & gas, chemical, and power generation applications.

Key Features

• Material: Duplex Stainless Steel UNS S32205

• Standard: ASTM A790

• Type: Seamless Pipe (SMLS)

• Size: DN50 (2″ Nominal Bore)

• Wall Thickness: SCH10S (thin wall, suitable for moderate pressure systems)

• Length: 1030 mm

• Surface Finish: Pickled & Annealed for smooth and corrosion-protected surface

• Heat Treatment: 100% HT for structural integrity and corrosion resistance

• Strength: Yield strength ≈ 450 MPa, almost double that of 304/316L

Specifications

Why Choose Duplex S32205?

1. High Mechanical Strength
   – Provides nearly double the yield strength compared to standard austenitic stainless steels.

2. Superior Corrosion Resistance
   – Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in seawater and chloride-rich environments.

3. Balanced Microstructure
   – 50% ferrite and 50% austenite structure provides both toughness and stress resistance.

4. Cost-Effective Alternative
   – Longer service life reduces downtime and maintenance costs, making it a better investment than 304/316 stainless steel in harsh conditions.

Applications

• Offshore & Marine Engineering – seawater cooling, shipbuilding, subsea pipelines.

• Oil & Gas Industry – flow lines, risers, manifolds, process piping.

• Power Generation – boiler systems, heat exchangers, condensers.

• Chemical Processing – acid and chloride piping systems.

• Desalination Plants – brine discharge, seawater intake, cooling loops.

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Surface Finish: Pickled & Annealed

The pickled surface removes mill scale and impurities, while annealing restores ductility and corrosion resistance. Together, they ensure:

• Smooth, clean surface for enhanced corrosion resistance.

• Extended service life in aggressive environments.

• Better performance during welding and installation.

Testing & Quality Assurance

Each ASTM A790 S32205 seamless pipe is subjected to strict quality control:

• 100% Heat Treatment (HT) to ensure correct duplex microstructure.

• Ultrasonic Testing (UT) and Eddy Current Testing (ET) for defect detection.

• Hydrostatic Testing for pressure integrity.

• PMI (Positive Material Identification) for chemical composition verification.

• Third-Party Inspection (SGS, BV, TUV) available upon request.

• 

FAQ

Q1: Why choose ASTM A790 S32205 over 316L stainless steel?
A1: It has nearly 2× the strength and much better resistance to chloride stress corrosion cracking and pitting, making it more reliable in marine and chemical environments.

Q2: What does “Pickled & Annealed” mean?
A2: Pickling removes impurities, while annealing improves grain structure and corrosion resistance, resulting in a smooth and durable finish.

Q3: What is the importance of 100% HT?
A3: Heat treatment ensures a balanced duplex structure (ferrite + austenite), giving maximum strength, toughness, and corrosion protection.

Q4: Can DLSS provide third-party inspection?
A4: Yes, DLSS works with SGS, BV, TUV, and LR to provide full inspection and certification.

Why Choose DLSS?

• Wide range of duplex & super duplex pipes and fittings.

• Strict testing & inspection procedures to guarantee reliability.

• Export expertise – supplied projects in over 40 countries.

• Seaworthy packaging with capped ends, PE wrap, and wooden cases.